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- 01Study of high-power microwave protection technology based on low-temperature plasma2023,45(6):84-89(25963)
- 02A last-write-touch prediction scheme used to reduce remote Cache miss latency2015,37(1):14-20(25482)
- 03Constant envelope modulation and multiplexing technologies for BDS global navigation signals2017,39(5):6-13(24708)
- 04Electromagnetic launch technology2016,38(6):1-5(22732)
- 05One-dimensional analysis for performance of ejector with precooling2017,39(3):1-6(22496)
- 06Numerical simulation on the aerodynamic performance of hypersonic glide vehicle2012,34(4):22-27(21896)
- 07FlatLFS: a lightweight file system for optimizing the performance of accessing massive small files2013,35(2):120-126(21815)
- 08Designing method of supersonic nozzle with controllable contour2012,34(5):1-4(21779)
- 09Dimension reduction method of true proportional navigation guidance law2012,34(3):1-5(21432)
- 10A survey of gliding guidance methods for hypersonic vehicles2017,39(3):15-22(21425)
- 01Electromagnetic launch technology2016,38(6):1-5(18786)
- 02One-dimensional analysis for performance of ejector with precooling2017,39(3):1-6(16642)
- 03Research on Radar Target Discrimination in the Missile Defense System2004,26(4):6-9(16233)
- 04A survey of gliding guidance methods for hypersonic vehicles2017,39(3):15-22(15789)
- 05A last-write-touch prediction scheme used to reduce remote Cache miss latency2015,37(1):14-20(15360)
- 06Evaluating matrix multiplication-based convolution algorithm on multi-core digital signal processors2023,45(1):86-94(14464)
- 07Constant envelope modulation and multiplexing technologies for BDS global navigation signals2017,39(5):6-13(14199)
- 08FlatLFS: a lightweight file system for optimizing the performance of accessing massive small files2013,35(2):120-126(13243)
- 09Learning to rank based on user relevance feedback2013,35(2):132-136(13126)
- 10Designing method of supersonic nozzle with controllable contour2012,34(5):1-4(12967)
- 01Comments on Multisensor Information Fusion1994,16(3):1-11
- 02A New Method of Measure the Pitching and Yaw of the Axes Symmetry Object through the Optical Image2000,22(2):15-19
- 03An Overview of Typical Methods for Human Reliability Analysis2007,29(2):101-107
- 04Study on SINS Alignment Algorithm with InertialFrame for Swaying Bases2007,29(5):95-99
- 05Electromagnetic launch technology2016,38(6):1-5
- 06A Study on the Evaluation Technology of theAttack Effect of Computer Networks2002,24(5):24-28
- 07An Improved Fitting Algorithm Design of BroadcastEphemeris for GEO Satellite2007,29(5):18-22
- 08Towards Technology of Virtual Prototyping in Weapon Systems1999,21(1):58-61 ,57
- 09OLDA-based method for online topic evolution in network public opinion analysis2012,34(1):150-154
- 10The Study of the Methods of the Linear Combination Weighting forMultiple Attribute Decision-making2005,27(4):121-124
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Research progress and prospect of atomic interference gyroscope
WANG Yuxiao; HU Jing; GU Nan; ZHANG Yi; WANG Zhiguo; LUO Hui; TAN Zhongqidoi:10.11887/j.issn.1001-2486.25020002 2025,47(5):1-23Abstract:As a representative of the next generation of gyroscopes, atomic gyroscopes have become a focal point of research in the field of high-precision inertial navigation and have garnered significant attention due to its theoretically ultra-high precision, exceptional long-term stability, and immense potential for miniaturization and integration. Among them, the atomic interference gyroscope, as a type of atomic gyroscope, has attracted widespread interest in the field of inertial navigation. The development of atomic interference gyroscopes was systematically reviewed. Beginning with fundamental principles, the critical technical components including atomic source preparation, interferometric loop construction, and phase resolution were elaborated on. Through rigorous analysis, the intrinsic correlations between core performance parameters such as sensitivity and ultimate accuracy were established, while their mutual constraint mechanisms was elucidated. Furthermore, the physical origins of engineering bottlenecks including limited data update rates and narrow dynamic ranges were revealed. Finally, the future development directions and trends for atomic interference gyroscopes were outlined, emphasizing the need for in-depth research in several areas: solving external interference issues to improve accuracy, improving chip processing technology for miniaturization and integration, optimizing the combined inertial sensors, increasing data update rates, and exploring ways to expand dynamic range.
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Pulse compression technology for ultrafast two-dimensional electronic spectroscopy
GUO Yu; SONG Yindoi:10.11887/j.issn.1001-2486.25040031 2025,47(5):24-33Abstract:Pulse compression is one of the key technologies in ultrafast 2DES (two-dimensional electronic spectroscopy), which determines the time resolution of the system and is of great significance for studying ultrafast dynamic such as excited-state relaxation, solvation, and quantum coherent energy transfer. A systematic review of commonly-used pulse compression methods in 2DES was provided. The time-frequency characteristics of femtosecond laser pulses were introduced. Then, the principles and limitations of various pulse compression techniques were discussed in detail, including grating pairs, prism pairs, grating-prism combinations, pulse shapers, and chirped mirror pairs. By examining representative cases, the selection strategies for compression methods in different 2DES systems were analyzed. Through a systematic review of different pulse compression methods in 2DES, aimed to facilitate the development of advanced domestically mastered ultrafast spectroscopic instruments and contribute to the advancement of ultrafast science and related interdisciplinary fields.
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Development and application of high speed acquisition system based on gated PMT and LIBS technology
SHI Jiaming; YAN Ziqi; GUO Lianbo; HUANG Weihua; OUYANG Zhiyong; MA Honghua; TAO Zhiyong; NIE Junfeidoi:10.11887/j.issn.1001-2486.24100006 2025,47(5):34-40Abstract:LIBS (laser induced breakdown spectroscopy) combined with the signal acquisition device of gated PMT(photo multiplier tube) technology is one of the key components that affect the miniaturization and integration of the LIBS analysis system. Therefore, a 12 bit PMT signal high-speed acquisition system with a 7.6 MHz acquisition frequency was designed and implemented using a microcontrol chip and an AD9226 chip. The element lead(Pb) and chromium (Cr) were quantitatively analyzed. The experimental results show that LIBS combined with Gated-PMT analysis system adopts high-speed acquisition system to establish Pb, Cr element calibration curve fitting degree is 0.988, 0.978, relative standard deviation is 3.56%, 6.57%, detection limit is 0.013 mg/L and 0.087 mg/L, respectively. Compared with the LIBS detection technology without PMT, it is an order of magnitude lower. Compared with inductively coupled plasma-mass spectrometry, the relative errors of Pb solution with 7.0 mg/L and Cr solution with 0.7 mg/L were 2.81% and 3.26%, respectively. Therefore, the PMT signal high-speed acquisition system has a good quantitative effect in the LIBS analysis of heavy metals in aqueous solutions, and has the advantages of small size, low power consumption and low cost, which is conducive to further promoting the application of LIBS technology in the field of water quality heavy metal detection.
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SHU Sheng; LI Jingbo; GAO Wei; YANG Mengmengdoi:10.11887/j.issn.1001-2486.25010007 2025,47(5):41-50
Abstract:In current research, less attention has been paid to the relationship between the thickness and optoelectronic properties of α-In2Se3 and most research has been focused on the mechanical exfoliation of α-In2Se3 nanosheets, which is not conducive to future industrial applications. A modified physical vapor deposition method for the controllable growth of α-In2Se3 was proposed, and the broad-spectrum response performance of three thicknesses of α-In2Se3 nanosheets in the visible to near-infrared wavelength range was systematically studied. The results indicate that the thickness of α-In2Se3 nanosheets can significantly regulate the photoelectric performance, and the photoresponsivity and specific detection rate increase with increasing thickness. In addition, it was found that the α-In2Se3 with a thickness of 32.8 nm exhibited a photocurrent anisotropy ratio (dichroic ratio) of 4 at 635 nm, indicating good polarization-sensitive detection functionality. In summary, the two-dimensional α-In2Se3 prepared by the physical vapor deposition method demonstrates a wide visible-infrared spectral response and good polarization detection ability, making it an ideal candidate material for two-dimensional multifunctional optoelectronic devices.
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CHEN Shimin; XIAO Xusheng; HE Wentao; LIU Chengzhen; GUO Haitaodoi:10.11887/j.issn.1001-2486.25030031 2025,47(5):51-61
Abstract:To address the challenges of interfacial defects and thermal mismatch in heterogeneous optical fusion fiber splicing for integration of mid-infrared all-fiber lasers system, a multiphysics-coupled modeling and parameter co-optimization methodology was proposed. By constructing an asymmetric splicing model, the coupling mechanisms between thermal gradient distribution, material properties, and fiber dimensions was revealed. A parameter optimization methodology for splicing experiments was established through numerical simulations, achieving low-loss (0.15 dB) and high-strength (278 g) splicing of silica/fluoride/fluorotellurite fibers. Experimental results demonstrated that the optimized heterogeneous fiber splice joints achieved high-power transmission across multiple bands (>23.2 W @ 1 976 nm, >100 W @ 981 nm) and enabled a fully fiberized 2.8 μm laser system with an output power of 20.3 W. Accelerated aging tests confirmed the systems long-term stability (0.37% power fluctuation @ 10.2 W over 1 h) and validated that the splice joints met high-power damage resistance thresholds.
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Low-power high-performance fiber-coupled acousto-optic modulator based on novel chalcogenide glass
WANG Yingying; LI Changyou; JIANG Lingling; WU Zhongchao; LIN Changgui; DAI Shixundoi:10.11887/j.issn.1001-2486.25040006 2025,47(5):62-69Abstract:Chalcogenide glasses, with their broad infrared transmission window and high acousto-optic figure of merit, represent an ideal medium for low-power high-performance acousto-optic modulators, potentially overcoming the diffraction efficiency and power consumption limitations of acousto-optic modulators based on conventional materials. Ge21Sb18S61 chalcogenide glass, characterized by its wide infrared transparency and high refractive index, was systematically investigated for its thermal, physical, optical, and acoustic properties. Using this glass as acousto-optic medium, a high-performance fiber-coupled acousto-optic modulator was successfully fabricated. Experimental results show that under a radio frequency driving power of 0.52 W, the modulator achieves a diffraction efficiency of 84%, a rise time of 41 ns, and an extinction ratio as high as 61 dB, exhibiting excellent low-power consumption and high-efficiency characteristics. This study provides crucial technical support for the design and development of novel acousto-optic devices, contributing to advancements in high-speed optical communication and fiber sensing applications.
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Real-time gravity measurement filtering of laser gyro inertial group fitted by neural network
GAO Chunfeng; CHENG Jiayi; CHEN Mailun; WEI Guo; LUO Hui; HOU Chengzhi; ZHU Xu; MA Haiyang; WANG Jingdoi:10.11887/j.issn.1001-2486.25010021 2025,47(5):70-77Abstract:To overcome the inherent fixed time-delay limitation of conventional gravity filtering methods in laser gyro-based inertial navigation gravity measurement systems, a real-time gravity data processing method based on neural network-approximated FIR (finite impulse response) filtering was proposed. By fitting the FIR filter through neural network implementation, the long dependency on future data was effectively reduced, thereby effectively reducing filtering delay. Experimental results show that compared with the FIR filter, the processing delay of the proposed method is reduced by 93%, and the average filtering accuracy is better than 2 mGal. This indicates that the proposed method can significantly improve the real-time performance of data processing while maintaining high accuracy, providing a solution for the real-time gravity measurement of the laser gyroscope inertial group gravity measurement system.
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Noise reduction method of high frequency signal in dynamic gravimetry
WEI Guo; CHEN Mailun; LUO Hui; GAO Chunfeng; CHENG Jiayi; WANG Jing; HOU Chengzhidoi:10.11887/j.issn.1001-2486.25010018 2025,47(5):78-85Abstract:In recent years, the dynamic gravity measurement technology utilizing optical-gyro inertial navigation systems has advanced rapidly, owing to its high efficiency capabilities in acquiring Earths gravity field data. However, existing filtering methods exhibit limitations in addressing the frequency-domain aliasing of gravity signals and noise, which severely constrains the accuracy and resolution of measurements. To address these challenges, a novel joint noise reduction method integrating EMD (empirical mode decomposition) and WCF (wavenumber correlation filtering) was innovatively proposed. The raw gravity results were low-pass filtered initially. The filtered results then underwent EMD, and a threshold was applied to retain low-order intrinsic mode functions. Subsequently, correlation filtering was implemented on repeated line retention results to reconstruct signals and suppress noise. Simulation experiments demonstrate that the proposed method achieves a 44% improvement in signal-to-noise ratio and a 48% reduction in mean square error compared to traditional EMD processing. These results confirm the effectiveness of the EMD-WCF method in balancing measurement accuracy and resolution, offering a new strategy for high-frequency gravity signal denoising.
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Online calibration algorithm of vehicle-mounted SINS/1D-LDV lever-arm error
ZHANG Tao; NIE Xiaoming; ZHOU Jian; WANG Qi; XIANG Zhiyidoi:10.11887/j.issn.1001-2486.25010039 2025,47(5):86-93Abstract:Aiming at the problem that the lever-arm velocity error between the measured speeds of 1D-LDV (one-dimensional laser Doppler velocimeter) and SINS(strapdown inertial navigation system) caused by their different installation positions in the vehicle-mounted integrated navigation systems composed of 1D-LDV and SINS, an online calibration algorithm based on Kalman filter was proposed to calibrate and compensate the mounting lever-arm. By introducing a reference point that maintains alignment between the velocity direction and the carriers direction of motion during movement, the traditional lever-arm velocity error model was improved, so that it can accurately characterize the actual relationship between the measured velocities from the 1D-LDV and SINS. The vehicle experiment results show that the calibration algorithm can effectively calibrate the arm error between 1D-LDV and SINS. By using the 1D-LDV measured velocity (after lever-arm error compensation) and the gyroscopic data from the SINS to perform dead reckoning, the horizontal positioning errors in two experimental trials are reduced from 8.80 m and 6.60 m to 7.07 m and 5.48 m respectively, demonstrating a moderate improvement in navigation and positioning accuracy.
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XIE Tianpeng; WANG Chunxiao; JIANG Chenghao; JIANG Yan; ZHU Jingguodoi:10.11887/j.issn.1001-2486.24120036 2025,47(5):94-102
Abstract:Based on the application of laser active detection using the cat-eye effect, the model errors introduced in existing research due to the neglect of aperture obstruction was addressed. The laser echo efficiency under the influence of the aperture was modeled and simulated under no defocus, positive defocus, and negative defocus conditions. Numerical simulations were performed using Zemax to validate the model and simulation results. The results show that the maximum incident angle of the cat-eye effect decreases with increasing focal length and slightly increases with greater defocus. The echo efficiency decreases linearly with the increasing incident angle, and the rate of decrease accelerates as the focal length increases. When the objective lens radius and reticle diameter are both 25 mm, the focal length is 100 mm, the incident angle is 7.125°, and there is no defocus, the prediction errors in echo efficiency for the existing and proposed models are 152.653% and 1.213%, respectively. The findings enhance the existing theoretical model of laser active detection and provide valuable insights for optimizing detection system performance.
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Advance on calculation methods of fluid-solid coupled heat transfer with regenerative cooling system
HU Tianyong; SHEN Binxian; ZENG Lei; TANG Zhigongdoi:10.11887/j.issn.1001-2486.24120040 2025,47(5):103-115Abstract:Fluid-solid coupled heat transfer is regarded as a key challenge in the refined design of regenerative cooling thermal protection systems. From the perspective of fluid-solid heat transfer, the calculation methods for heat transfer between hot gas and the solid chamber wall were introduced, the heat transfer calculation methods of coolants within cooling channels were presented, and the special factors affecting heat transfer between the coolant and the wall were analyzed, including secondary flow, supercritical effects, and cracking characteristics, etc. For regenerative cooling systems, three fluid-solid coupled heat transfer calculation methods were proposed: the whole-domain solution method, the partition solution method based on correlation criteria, and the partition solution method based on continuity boundary conditions. In the field of unsteady heat transfer, the research progress of fluid-solid coupled unsteady calculation methods was reviewed, and the possible future development directions of this field were preliminarily discussed.
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DAI Huliang; XING Haoran; HE Yixiang; LU Zi; ZHANG Lanbin; WANG Lindoi:10.11887/j.issn.1001-2486.23070019 2025,47(5):116-124
Abstract:A vibration control strategy based on NTET (nonlinear targeted energy transfer) for suppressing galloping of the cylinder was proposed. The effect of NTET on controlling galloping responses was explored from both theoretical and experimental aspects. The fluid force was described based on the quasi-steady theory. The dynamic theoretical model was constructed based on the energy method for the coupling of cylinder galloping and NTET. The theoretical model was validated by comparing the predicted results with experiments. The linear dynamic analysis shows that increasing the spring pretension can increase the coupled damping ratio and frequency. As a result, the onset wind speed of galloping for the square cylinder is decreased. The nonlinear dynamics analysis reveals that the NTET′s linear and nonlinear stiffness have an effect on the vibration responses. There is an optimal value of linear stiffness where the suppressing effect is the best. The larger the nonlinear stiffness is, the better the control effect of the NTET. Whats more, the smaller the spring pretension of the NTET, the larger the spring stiffness, and the lower the amplitude of the cylinder. This study can provide theoretical support and experimental data for effectively designing galloping control strategies in engineering applications.
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Approximate optimization method for constraints dynamic relaxation of black box model
MA Shuaichao; WU Zeping; YANG Jiawei; GAO Jingweidoi:10.11887/j.issn.1001-2486.23020012 2025,47(5):125-133Abstract:The surrogate model-based optimization method provides an effective technical approach for the application of high-precision simulation models in optimal design due to its efficient search capability. To address the problem of time-consuming black-box constraint processing for optimization problems, a multi-constraint adaptive sampling method based on improved feasible rules was proposed, an elite archive-driven inexact search method and an ε-constraint-preserving pseudo-feasible domain construction method were established, and the algorithms ability to explore the boundaries of the feasible domain was enhanced by dynamically scaling the feasible domain to accept high-quality nonfeasible samples during the iterative process, which improved the surrogate model-based optimization search ability. Simulation results of the Congress on Evolutionary Computation constraint optimization standard function indicate that the ε- onstraint maintenance optimization method is effective in solving the multi-constraint surrogate model optimization problem compared with the existing methods. The results for the solid rocket motor rear wing pillar charge design show that the algorithm has the potential to be applied to complex engineering problems.
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ZHANG Jin; WANG Kemao; YAN Bing; WANG Liyaodoi:10.11887/j.issn.1001-2486.23030050 2025,47(5):134-143
Abstract:For the high-precision rendezvous trajectory optimization problem of a single chase satellite serving multiple target satellites on orbit, a three-step serial optimization method based on the multi-round iterative correction was proposed. The rendezvous sequence and approximate impulse solutions based on the analytical J2 perturbation model were obtained by using the differential evolution algorithm, and the high-precision solution of the first rendezvous maneuvering impulses was obtained by using the local optimization of the sequential quadratic programming algorithm. Moreover, a multi-round iterative correction model was constructed to update the subsequent target satellites′ states and maneuvering impulses to reduce the influence of the error diffusion between different models. Simulation results show that the proposed method can stably obtain the high-precision maneuvering parameters with approximate least cost in a few iterations.
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LIN Yujing; LIU Weidong; WEI Feng; YANG Rui; YU Jiangfeidoi:10.11887/j.issn.1001-2486.24090015 2025,47(5):144-156
Abstract:Shock wave/boundary layer interaction results in significant aerodynamic heating on the surface of the aircraft. The original flow field structure is also affected by the increase in wall temperature. To investigate the flow field characteristics of shock wave/boundary layer interaction under CHT (conjugate heat transfer) conditions, numerical simulations were performed. The flow field structure, wall parameters and solid domain temperature distribution were analyzed under different wall materials, aerodynamic heating time and total temperature. The numerical results indicate that: the length of the separation bubble obtained using the CHT method is between the results for isothermal and adiabatic walls. As the thermal diffusivity of the wall material decreases and the aerodynamic heating time increases, the length of the separation bubble increases. At the same time, the wall temperature peak increases, and the heat flux peak decreases. For the same material and heating time, an increase in total temperature reduces the length of the separation bubble. This suggests that the change in Reynolds number caused by the total temperature dominates the separation characteristics. Additionally, for the solid domain at the corresponding position of the reattachment zone downstream of the interaction, a significant temperature rise is observed. The high-temperature zone inside the bakelite wall diffuses very slowly and exhibits a flaky distribution.
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Mathematical model for single-course resistance torque of spacesuit soft joints
DONG Changlin; ZHOU Shiming; LI Daokuidoi: 2025,47(5):157-164Abstract:Aiming at the problems of low accuracy and large shape error of existing models for single-course resistance torque of spacesuit soft joints, an improved B-W(Bouc-Wen) mathematical model was established. By analyzing the hysteresis curve characteristics of single-course resistance torque of spacesuit soft joints, the B-W hysteresis model was introduced and improved to eliminate the redundancy and symmetry of the model, which was used to characterize single-course resistance torque of soft joints mathematically. The individual genetic process of multi-island genetic algorithm was operated by using the probability thought of simulated annealing algorithm to identify the parameters of improved B-W model with high accuracy and efficiency. Based on the verification of experiments and simulations of different soft joints of spacesuit, the improved B-W model compared with the J-A(Jiles-Atherton) model is more suitable for the mathematical characterization of single-course resistance torque of spacesuit soft joints. The variance of resistance torque of improved B-W model is two orders of magnitude lower than that of J-A model. It shows that the mathematical model has high accuracy when applied to single-course resistance torque of spacesuit soft joints, and has strong applicability to different soft joints of spacesuit.
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Vertical damping of the superconducting electrodynamic suspension system and its improving measure
ZHOU Danfeng; ZHU Pengxiang; TAN Yiqiu; WANG Lianchun; LI Jie; CHEN Qiangdoi:10.11887/j.issn.1001-2486.23080020 2025,47(5):165-174Abstract:Due to the low damping characteristic of the superconducting EDS (electrodynamic suspension) system which may cause suspension instability problem, a six degree-of-freedom dynamic model for the high speed maglev sled system was established, and it was found that the suspension damping would become negative when the traveling speed exceeds 23.6 m/s, resulting in suspension instability to the maglev sled. The vertical damping ratio of the EDS system was calculated using the least square fitting method, and the relationship between the vertical damping and the speed was obtained. To stabilize the suspension system, a distributed DVA (dynamic vibration absorbers) scheme was proposed, and the effects of the DVA parameters on the suspension stability were investigated. To minimize the influence of the DVA scheme on the acceleration performance of the maglev sled, the feasibility of applying low mass (≤1 kg) DVAs to the maglev sled was discussed. Further, the vibration suppression effect of this scheme was investigated considering the vertical misalignments of guideway girders. Results shows that the proposed scheme can significantly increase the damping and stability of the suspension system, and it also well suppresses the vibration of the sled-body caused by misalignments of the ground suspension coils. This scheme provides a useful reference for the design of the suspension system of the maglev sled system, the vacuum tube high speed maglev train, etc.
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Group false-target jamming method with stable position against linear frequency modulation radars
PAN Xiaoyi; FENG Xuewen; ZHOU Li; CHENG Yang; CHEN Jiyuan; MENG Xiaomingdoi:10.11887/j.issn.1001-2486.23050010 2025,47(5):175-185Abstract:In order to generate multiple false targets and interfere the advanced chirp rate agile LFM( linear frequency modulation) radars, a group false-target jamming method with stable position, based on intermittent sampling repeater jamming and bidirectional shift-frequency modulation, was proposed. The intermittent sampling frequency and frequency shift modulation were obtained by mixing the radar signal with two time-delay signals at the same time. The interference signal was obtained by intermittent sampling and repeating processing and bidirectional frequency shift modulation processing in sequence. Theoretical analysis and simulation experiments show that the position of the false target group generated by this jamming method is constant for advanced LFM radar systems such as frequency modulation slope agility. The proposed method is conducive to forming good interference effects during pulse accumulation. Meanwhile, compared with the intermittent sampling repeater jamming or the shift-frequency jamming, the range of group false targets via the proposed method is more wider, which is valuable in practical engineering applications.
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Detecting domain-specific social events via temporal evolution feature mining
ZHAO Dongxu; ZHANG Xin; PAN Yan; DUAN Jiashundoi:10.11887/j.issn.1001-2486.23070017 2025,47(5):186-196Abstract:In view of the insufficient mining of implicit associative relationships and the problem of neglecting the temporal evolution factor, a domain-specific social event detection method via temporal evolution feature mining was proposed. The data was sliced by time and an entity interaction graph was constructed by considering the impact of duplicate event records from different sources on detection, in order to reduce the influence of database errors. Multi-relational graph convolutional network was improved, and the graph structure information of historical evolution sequence was updated by interaction relationships. Attention mechanism was used to learn core features to obtain global embedding of sequence units. Implicit association was mined sufficiently. Based on recurrent neural network, temporal evolution features were extracted to obtain the global embedding and the temporal evolution factor was mined effectively. Experiment results show that the proposed method can be applied to domain-specific social event detection task, which is better than existing methods.
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Reinforcement learning method via meta-learning the exploring latent variable
LI Yiying; ZHOU Weidoi:10.11887/j.issn.1001-2486.23050020 2025,47(5):197-205Abstract:Aiming at the issues of low utilization of interaction data or the need for additional task data in traditional agent exploration work, an online-learnable exploration latent variable that characterizes the current task features to assist the policy network in behavioral decision-making was innovatively introduced. There was no need for additional multi-task data or additional environmental interaction steps in the current task. The exploring latent variable was updated in the learnable environment model, and the environment model underwent supervised updates based on the intelligent agent and real environment interaction data. The exploration in advance in the simulated environment model was assisted by the exploring latent variable, and thus the performance of agents in the real environment was improved. The performance in typical continuous control tasks was raised by about 30% in the experiments, which was of guiding significance for the single-task exploration and meta reinforcement learning research.
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Designing online anti-jamming strategy for agile frequency radar via Thompson sampling
WU Zhenhua; QIAN Jun; ZHANG Lei; CHEN Lili; ZHU Ning; YANG Lixiadoi:10.11887/j.issn.1001-2486.23060016 2025,47(5):206-215Abstract:In the context of dynamic countermeasures between radar and active jammer, the working frequency of radar and adversarial jammer were modeled as the combat action space based on the multi-arm bandit model in online learning theory. By exploring the uncertainty of the jamming environment state through multiple-round pulse transmission, a frequency channel jamming recognizer based on a convolutional neural network was constructed to obtain the posterior probability estimation of the belief state of each frequency channel. Then the Thompson sampling algorithm efficiently solved the built multi-arm bandit model, achieving a balance between exploration and exploitation. Simulation results show that compared with random frequency agility and deep reinforcement learning algorithms, the method had higher convergence performance and was more adaptable to dynamic fast-changing jamming environments, which can give full potential to the antagonism advantage of radar active waveform transmission.
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LI Xinhang; ZHAI Xiaofei; LIU Hua; LIU Jinlidoi:10.11887/j.issn.1001-2486.23080006 2025,47(5):216-224
Abstract:In order to establish a more accurate dynamic launch calculation model of the electromagnetic rail launcher, the equivalent frequency was introduced according to the current diffusion equation to simulate the change of skinning depth during the armature launching process, so as to calculate the motion process of the armature equivalently by using the results of the static simulation of the armature. A parameter extraction method was proposed, in which the corresponding relationship between electrical parameters and frequency was extracted by finite element simulation, and then the corresponding equivalent frequency was obtained by calculating the skin depth of the current in the launch process by the micro-element method. The equivalent frequency was combined with the above finite element simulation-results to calculate the dynamic electrical parameters of the system.The method is used in the whole system simulation, and the error between simulation and experiment is within 1%, which proves the effectiveness of the method.
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ZHOU Cheng; XU Da; CAO Zhendidoi:10.11887/j.issn.1001-2486.23050009 2025,47(5):225-235
Abstract:To make full use of maintainability multi-source prior data and improve the fusion accuracy of prior distributions to ensure the accuracy of maintainability verification results, a prior distribution determination method for maintainability multi-source conflict evidence data fusion was proposed to solve the problem of conflicts in multi-source data. Fully mining and extracting the feature information of multi-source data, constructing evidence mass function based on sample size, distribution characteristics and data importance respectively, comprehensively considering the correlation between evidence and the uncertainty of evidence itself, introducing angle cosine to measure the degree of conflict between evidence. By combining the support degree and uncertainty of the evidence, the multi-source conflict evidence data fusion model was established to achieve the effective fusion of multi-source data and determine the comprehensive prior distribution. Combined with the analysis of two cases, the proposed method is proved to be effective and feasible.
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Bevel gear dynamic modeling and fault response analysis of helicopter main reducer
ZHANG Lun; HU Jiao; YANG Yidoi:10.11887/j.issn.1001-2486.23090004 2025,47(5):236-245Abstract:The dynamic characteristics of the helicopter main reducer bevel gear have a direct influence on the operating performance of the helicopter transmission system. Taking into account factors such as transmission error and backlash, a nonlinear damage dynamic model of a bevel gear system with bending-torsion-axial coupling was established by using the lumped-parameter method. In order to obtain the key parameter in the damage dynamics model, a slicing method for calculating the time-varying meshing stiffness of spur bevel gear pair was proposed, which broke through the limitations of traditional potential energy method that can only be applied to cylindrical gear pair and can achieve rapid evaluation of time-varying meshing stiffness under different states. By comparing the model simulation and experimental results, it is shown that the established model can effectively simulate the dynamic response characteristics of the bevel gear system under normal and fault conditions, reveal the system fault response mechanism and fault mechanism, and provide theoretical basis and data support for the development of a helicopter transmission system health and usage monitoring system.
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REN Ruixuan; LI Tiejun; JIN Changsong; CHEN Xinhaidoi:10.11887/j.issn.1001-2486.23090016 2025,47(5):246-253
Abstract:Building upon the traditional PINN(physics-informed neural network), two improved methods for solving partial differential equations, EmPINN(expanding physics-informed neural network with modified multi-layer perceptron) and DL-PINN(diverse loss function physics-informed neural network), were presented by incorporating dimension expansion and diverse physics loss functions. EmPINN innovatively introduced a neural network structure with residual connections and a dimension-expanding mechanism. DL-PINN, based on EmPINN, combined the dimension-expanding mechanism with gradient enhancement and variational physical information to incorporate multiple physical information more effectively and improved the fitting capability of the neural network. Experimental results demonstrate that the proposed methods outperform traditional PINN method, improve solution accuracy by up to two orders of magnitude on different partial differential equation cases.
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Combinatorial optimization methods for emergency material scheduling considering disruption risk
ZHANG Chuang; LI Yantong; YAN Qian; GENG Jingyi; LIANG Jingruidoi:10.11887/j.issn.1001-2486.23110012 2025,47(5):254-262Abstract:Aiming at the problem that the supply of emergency material distribution depots might be disrupted after a disaster, the post-disaster emergency material supply considering the disruption risk of distribution depots was studied. In pursuit of globally optimal solutions, decisions including location selection of distribution depots, the assignments of material demands to distribution depots, and the supply sequencing at each distribution depot were integrated into a combinatorial scheduling-location problem. A scenario-based mixed-integer linear programming model was formulated with the objective function of minimizing the expected makespan of the supply task. A matheuristic algorithm based on predetermined ordering and kernel search was proposed to solve the problem efficiently. A numerical experiment is conducted and the result shows that the proposed algorithm is significantly effective and can provide precise, quantitative, and globally optimal scheduling plans for a task with up to 200 disaster-affected areas and 5 distribution depots within reasonable computation time.
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Memory Optimization Method for Control Flow Computation Graph
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Fault detection technology for permanent magnet synchronous motor based on detection coil
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Multi-scale learning algorithm for infrared UAV target detection
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Process fluctuation influence on single event upset in sub-20 nm FinFET SRAM
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Segment Routing Optimization Algorithm Fusing Deep Reinforcement Learning and Load Centrality Theory
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Research Progress on New Computing-Controlled Network Architecture and Key Technologies
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A monocular pose measurement method for inaccurate 3D model of a target
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Optimized design of stiffened panels considering the twist angle error of stringers
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Research on the changing rules of corrosion electric field of rotating disk in turbulent medium
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Probability tunable random number generator for random simulation of accelerated particle transport
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Sampling communication formation control of multi-agent systems with minimum-energy constraint
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Review of Power Semiconductor Modules for High Power Density Power Converters
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A Positioning and Speed Measuring System of Linear Motor Applied in Electromagnetic Sled
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Hybrid macro-/mesoscopic scheme for thermally-induced oscillatory rarefied gas flows
The Priority Publication Column showcases the articles that have been determined to be accepted by this journal after peer review, and the editing and proofreading process has not been completed before the formal publication.
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Multi-scale learning algorithm for infrared UAV target detection
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Imaging Prior-Driven Super-Resolution for Object Detection under Oblique Views
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Interference avoidance beam planning method between NGSO constellation and GSO satellite
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Application of robust Kalman filter to time-frequency system integrity monitoring
The "Online First" column showcases articles that have been accepted by this journal, undergone preliminary editing and proofreading, and are published first online on CNKI .
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Development progress and technical breakthroughs of space mission design industrial software ATK 3.0
LUO Yazhong; YANG Zhen; WANG Hua; ZHOU JianpingLUO Yazhong; YANG Zhen; WANG Hua; ZHOU Jianping.Development progress and technical breakthroughs of space mission design industrial software ATK 3.0[J].国防科技大学学报,2025,47(4):1-9AbstractSpace mission design software spans the entire lifecycle of space missions and is regarded as the cornerstone of the aerospace industrial software system. Leveraging nearly three decades of technical expertise in the field of manned spaceflight, the research team from the National University of Defense Technology initiated the development of the independent industrial software ATK(aerospace tool kit) in 2020. By the end of 2024, the ATK 3.0 version was officially released, encompassing 5 major categories and 21 functional modules, including standard platform, visibility and coverage analysis, mission analysis, orbital design, and secondary development. The development of ATK has been deeply and continuously supported by China Manned Space Engineering exploring a collaborative research and development model characterized by "engineering-driven demand+centralized academic development". This software has had a significant impact in aerospace engineering, space security, and academic education, marking a solid first step toward replacing STK. The development history of ATK was reviewed, and the functional features was elaborated on. Focuses on analyzing its core technologies breakthroughs of ATK, such as large-scale software architecture design, computational kernel development, and orbital maneuver planning were selective analysed. While ATK faces challenges in enhancing its functionality and building its application ecosystem, its future development roadmap and strategic objectives were outlined.
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LI Dazi; LIU Zibo; BAO Yanyang; DONG Caibo; XU XinLI Dazi; LIU Zibo; BAO Yanyang; DONG Caibo; XU Xin.Research review of graph reinforcement learning algorithms and their applications in the industrial field[J].国防科技大学学报,2025,47(4):76-90
AbstractSuccessful application of reinforcement learning in decision support, combinatorial optimization, and intelligent control has driven its exploration in complex industrial scenarios. However, existing reinforcement learning methods face challenges in adapting to graph-structured data in non-Euclidean spaces. Graph neural networks have demonstrated exceptional performance in learning graph-structured data. By integrating graphs with reinforcement learning, graph-structured data was introduced into reinforcement learning tasks, enriching knowledge representation in reinforcement learning and offering a novel paradigm for addressing complex industrial process problems. The research progress of graph reinforcement learning algorithms in industrial domains was systematically reviewed, summarized graph reinforcement learning algorithms from the perspective of algorithm architecture and extracted three mainstream paradigms, explored their applications in production scheduling, industrial knowledge graph reasoning, industrial internet, power system and other fields, and analyzed current challenges alongside future development trends in this field.
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Review of diffusion models for inverse problems in image processing
WANG Zelong; WU Yuhang; LI Jian; YANG XuanWANG Zelong; WU Yuhang; LI Jian; YANG Xuan.Review of diffusion models for inverse problems in image processing[J].国防科技大学学报,2025,47(4):91-110AbstractDiffusion models represent a novel type of generative artificial intelligence models. Compared to traditional networks such as generative adversative networks, variational autoencoders, and flow models, diffusion models are characterized by their robust training, high fidelity and diversity in generation, and strong mathematical interpretability, and so they are widely used in fields of computer vision, signal processing, multi-modal learning and so on. Diffusion models are capable of sufficiently learning and exploring the deep generative priors from the training images, providing a novel paradigm for solving inverse problems in image processing. In order to systematically sort out the development status of diffusion model, especially the latest progress in solving the inverse problem of image processing, the research of diffusion model for the inverse problem of image processing was reviewed. The basic principle and development status of diffusion model was expounded,the main technical route of using diffusion model to solve the inverse problem of image processing and some specific application results in this direction were emphatically introduced, and the future research directions were envisioned.
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Review of green shop scheduling problem
GAO Liang; YU Fei; LU ChaoGAO Liang; YU Fei; LU Chao.Review of green shop scheduling problem[J].国防科技大学学报,2025,47(2):1-23AbstractWith the vigorous development of the manufacturing industry, the problems such as environmental pollution an resource shortage have gradually become prominent, seriously affecting the sustainable development of society. Therefore, the transformation of manufacturing energy saving and carbon reduction is an inevitable requirement for global green and lowcarbon development. As one of the most important parts of the manufacturing systems, production scheduling can realize efficient and green operation of the manufacturing systems through the reasonable allocation of resources. Under the context of green manufacturing, the research of green shop scheduling problem has become a hot spot in the field of production scheduling. Therefore, a systematic review of the existing research since 2018 from the aspects of the green parallel machine scheduling problem, the green flow shop scheduling problem, the green job shop scheduling problem, the green flexible job shop scheduling problem, and the green distributed shop scheduling problem was conducted, the shortcomings of the existing research was summed up, and the direction of future research was pointed out.
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Progress and development trend of composite solid propellant constitutive model research
XU Yihang; LI Daokui; ZHOU ShimingXU Yihang; LI Daokui; ZHOU Shiming.Progress and development trend of composite solid propellant constitutive model research[J].国防科技大学学报,2025,47(1):1-22AbstractAs an important energy source of solid rocket motors, the mechanical properties of composite solid propellants have always been the focus of attention in the engineering field. The macroscopic constitutive model and the fine-scale mechanical model in the characterisation of propellant mechanical properties was focused on. The development of the two types of models was systematically sorted out. The differences between the models were clarified. The applicable conditions of various models were pointed out. The difficulties and challenges of macro and fine mechanical models in the characterisation of propellant mechanical properties at the present stage were analysed. The proposal of mechanical models represented by cross-scale mechanical models will help to solve the problem of propellant mechanical property characterisation. The key in the future modelling of propellant mechanical characterization is the experimental research under complex conditions, focusing on the development of high precision and high performance multiscale numerical computation methods, as well as the integration of data-driven technology represented by artificial intelligence technology into model innovation.
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Review and prospect of emitter manufacturing technology for ionic liquid electrospray thruster
LI Xiaokang; GUO Dawei; WU Jianjun; YANG Yuntian; CHE BixuanLI Xiaokang; GUO Dawei; WU Jianjun; YANG Yuntian; CHE Bixuan.Review and prospect of emitter manufacturing technology for ionic liquid electrospray thruster[J].国防科技大学学报,2025,47(1):67-82AbstractILET(ionic liquid electrospray thruster), one of the electrostatic micro-thrusters, has recently become a hot topic for researchers. The emitter is the core component that significantly affects the thruster performance, so its manufacturing is considered as one of the key technologies for the ILET development. Combined with the operating principle and the development history of ILET, the characteristics of propellant transport and manufacturing requirements for all three types of emitters, namely capillary, externally-fed and porous emitters, were analyzed. Based on this, the typical manufacturing materials and related manufacturing technologies were reviewed, while the advantages and disadvantages of different manufacturing technologies such as ion etching were summarized and remarked. For the proven manufacturing method of ultrafast laser ablation based on porous material, the development suggestions including emitter design, novel material fabrication, and study on laser-matter interaction mechanism were given.
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Review of key technologies for autonomous homing of parafoil systems
SUN Qinglin; YANG Jinshan; SUN Hao; CHEN ZengqiangSUN Qinglin; YANG Jinshan; SUN Hao; CHEN Zengqiang.Review of key technologies for autonomous homing of parafoil systems[J].国防科技大学学报,2024,46(4):1-15AbstractIn order to explore the key technologies of parafoil systems, including modeling, trajectory planning, and trajectory tracking control, to support their autonomous homing in wide application prospects in large-scale equipment airdrop replenishment, carrier rocket booster recovery, and natural disaster rescue applications. Through research on the development of parafoil systems both domestically and internationally, a comparative analysis and summary of the basic principles, commonly used methods, and cutting-edge technologies of the three key technologies were conducted, with a focus on the flexible modeling technology of parafoil systems in complex environments, trajectory planning technology in obstacle spaces, and trajectory tracking technology based on intelligent control strategies. A summary and outlook were made on the future development trends of key technologies for autonomous homing of parafoil systems, which can help researchers gain a comprehensive understanding of the research progress and development trends in autonomous homing of parafoil systems, and provide inspiration and reference value for further research in this area.
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Survey on dynamics and control problem research in spacecraft orbital pursuit-evasion game
ZHU Yanwei; ZHANG Chengming; YANG Fuyunxiang; YANG LepingZHU Yanwei; ZHANG Chengming; YANG Fuyunxiang; YANG Leping.Survey on dynamics and control problem research in spacecraft orbital pursuit-evasion game[J].国防科技大学学报,2024,46(3):1-11AbstractWith the rapid development of spacecraft rendezvous and proximity operation technology, the problem of orbital pursuit-evasion has gradually become a research hotspot in the aerospace field. From the perspective of dynamics and control, the research status of spacecraft orbital pursuit-evasion was reviewed. General form of the orbital pursuit-evasion problem model based on quantitative differential games was given, and various types of orbital pursuit-evasion problems were systematically sorted out. For the solution of pursuit and escape strategies, the advantages and disadvantages of various methods were analyzed for closed-loop strategy and open-loop strategy. Focusing on the combination of artificial intelligence algorithm and orbital pursuit and escape problem, the research status of orbital pursuit and escape strategy based on deep neural network and reinforcement learning was expounded. Regarding future prospects, development directions has been proposed, including the pursuit-evasion game situation analysis, the multi-spacecraft game control, the game dynamics and control under three-body problem.
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Analysis of the current research on the flying-wing aircraft
CHEN Qingyang; XIN Hongbo; WANG Peng; ZHU Bingjie; WANG Yujie; LU YafeiCHEN Qingyang; XIN Hongbo; WANG Peng; ZHU Bingjie; WANG Yujie; LU Yafei.Analysis of the current research on the flying-wing aircraft[J].国防科技大学学报,2024,46(3):39-58AbstractThe development trajectory of the flying-wing aircraft was sorted out, encompassing the early evolutionary history to the current state of research, along with contemplation and forecasts regarding future directions. Meanwhile, several key control challenges associated with flying-wing aircraft were discussed, including attitude control in a wide-speed domain under nonlinear conditions, high-precision autonomous take off and landing control under multiple effect coupling, robust control issues with approximate aerodynamic models and under strong disturbances, as well as control allocation problems arising from multi-surface redundancy. Moreover, the discussion on flow control issues that were currently a focal point in flying-wing aircraft research were discussed in depth. The following research trend of active flow control technology was expounded.
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Current status and trends of drag-free technology for space-based gravitational wave detection
ZHANG Jinxiu; TAO Wenjian; LIAN Xiaobin; WANG Jihe; MENG Yunhe; LIU YuanZHANG Jinxiu; TAO Wenjian; LIAN Xiaobin; WANG Jihe; MENG Yunhe; LIU Yuan.Current status and trends of drag-free technology for space-based gravitational wave detection[J].国防科技大学学报,2024,46(2):1-17AbstractThe drag-free control of the spacecraft is one of the key technologies to realize the ultra-static and ultra-stable operation of science platform for gravitational wave space detection. At present, the dynamics and control of the spacecraft system have been studied deeply by various research institutions at domestic and overseas, and different detection tasks have been proposed according to the requirements of different detection frequency bands. The design and control of spacecraft formation were introduced and analyzed in detail according to the exploration mission, and the principles and theoretical methods of drag-free and attitude control, high-precision inertial sensors and actuators involved were deeply dissected. The overall situation of demonstration and verification of drag-free spacecraft in orbit for space-based gravitational wave detection was detailed and analyzed. On this basis, the key problems required to be solved in the research of follow-up related were presented, and the research hotspots and trends in the methods of future dynamics and control of drag-free spacecraft systems were also pointed out.
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Reasearch progress and prospects of deep learning for visual speech generation
LIU Li; SUI Jinping; DING Ding; ZHAO Lingjun; KUANG Gangyao; SHENG ChangchongLIU Li; SUI Jinping; DING Ding; ZHAO Lingjun; KUANG Gangyao; SHENG Changchong.Reasearch progress and prospects of deep learning for visual speech generation[J].国防科技大学学报,2024,46(2):123-138AbstractIn order to further advance the development of visual speech learning, the task definition and research significance of visual speech generation was expounded and the difficulties and challenges were deeply analyzed in this field. Besides, the current status and development level of visual speech generation research was introduced, and the recent mainstream methods were sorted, classified and commented based on the difference of generation frameworks. At the end of the paper, the potential problems and possible research directions of visual speech generation were discussed.
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GAO Qinhe; HUANG Tong; QIAN Bingwen; SHEN Fei; WANG Dong; GAO LeiGAO Qinhe; HUANG Tong; QIAN Bingwen; SHEN Fei; WANG Dong; GAO Lei.Technical research review on analysis and evaluation of anti-damage capability for missile launching vehicle[J].国防科技大学学报,2024,46(2):182-196
AbstractIncreasing transparency of modern warfare has brought serious challenges to the survival of missile launching vehicle on the battlefield. Around the launcher anti-damage ability of analysis and evaluation technology, the threat of damage and damage mechanism faced by launcher were analyzed, current research status of four types of damage(shock wave, kinetic energy, thermal, and electromagnetic) from the perspective of the application of anti-damage capability assessment were elaborated, and different damage types in the evaluation of anti-damage capability and application directions in the analysis were putted forward; based on the vulnerability analysis space theory, the development process of equipment vulnerability analysis was summarized. It was considered that the logical transfer relationship from physical space to performance space was the key to the vulnerability analysis of launchers at present. Research trends of vulnerability criteria were introduced from the physical criteria, performance criteria and classification criteria, and the key criteria for vulnerability of launchers was proposed. Research concept and the main problems faced by analytical methods of the anti-damage capability of the launcher were explicitly described. Research conclusions can provide references for the analysis and evaluate related research of the anti-damage capability of the missile launching vehicle.
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GaN power devices and their radiation effects for space applications
BI Jinshun; SHEN Lizhi; MEI Bo; CAO Shuang; SUN Yi; YU QingkuiBI Jinshun; SHEN Lizhi; MEI Bo; CAO Shuang; SUN Yi; YU Qingkui.GaN power devices and their radiation effects for space applications[J].国防科技大学学报,2024,46(1):149-159AbstractIt is of great significance to study GaN(gallium nitride) power devices and their radiation effects to meet the needs of space applications and promote the construction of a new generation spacecraft. Main structures and working principles of GaN power devices were introduced. Research progress of total ionizing dose effect and single event effect of GaN power devices in recent years was reviewed. Degradation and damage mechanisms of GaN devices caused by radiation effects were analyzed and discussed. Research results show that GaN power devices have strong resistance to total ionizing dose. However, GaN power devices are prone to leakage and single event burnout due to their weak resistance to single event burnout, and most of the burnout points occur at the drain side of the gate edge. Research on the radiation damage mechanism of GaN power devices lacks authoritative theories and needs to be further mastered to provide theoretical support for their space application. GaN power devices with planar structure are the current mainstream technical solutions. Monolithic integration, high frequency and miniaturization are the development directions of GaN power devices in the future.
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Development status and technology challenges of high-altitude long-endurance solar-powered aircraft
YANG Xixiang;HOU Zhongxi;GUO ZhengYANG Xixiang;HOU Zhongxi;GUO Zheng.Development status and technology challenges of high-altitude long-endurance solar-powered aircraft[J].国防科技大学学报,2023,45(6):1-9AbstractHALE(high-altitude long-endurance) solar-powered aircrafts are the research frontiers, they can staying airborne for several months, and can form new application ability named "long-endurance+station-keeping". The three-stage development process of HALE solar-powered aircrafts was systematically summarized, including early exploration stage, rapid development stage and operational capability demonstration stage, and typical development plans aboard were introduced. Key technology challenges were analyzed, including aerodynamic configuration design, energy storage battery, high altitude propulsion, large scale structure and flight control, and the suggestions for research directions were proposed. All those can provide reference for innovation development of HALE solar-powered aircrafts.
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State of the art and prospects of neural architecture search
DING Ding;LIU Wenzhe;SHENG Changchong;SUI Jinping;LIU LiDING Ding;LIU Wenzhe;SHENG Changchong;SUI Jinping;LIU Li.State of the art and prospects of neural architecture search[J].国防科技大学学报,2023,45(6):100-131AbstractNeural architecture search is a task that aims to automatically search for the optimal neural network structure for different tasks, which is of great importance and inevitability in the joint development of deep learning and computer vision to the current stage. A comprehensive review of the research on neural network search was provided. In specific, the definition and significance of neural architecture search were introduced, and the difficulties and challenges faced in relevant research were deeply analyzed. Based on this, the mainstream search strategies was elaborate and summarize; Finally, the potential problems and possible future research directions were summarized and discussed to promote further development in this field.
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Research progress of anti-irradiation MRAM
SUN Jiejie;WANG Chao;LI Jiawei;JIANG Chuanpeng;CAO Kaihua;SHI Hui;ZHANG Youguang;ZHAO WeishengSUN Jiejie;WANG Chao;LI Jiawei;JIANG Chuanpeng;CAO Kaihua;SHI Hui;ZHANG Youguang;ZHAO Weisheng.Research progress of anti-irradiation MRAM[J].国防科技大学学报,2023,45(6):174-195AbstractThe novel non-volatile MRAM(magnetic random access memory) has the advantages of fast read and write speed, long data retention time and low power consumption, which attracts wide attention from researchers. Its excellent anti-irradiation capabilities are explored in depth, and further applications in aerospace and other fields are expected. The industrial development, technological changes and applications of MRAM were reviewed, the mature MRAM products of recent years were listed, and the advantages and disadvantages of different generations of MRAM were analyzed. The radiation effects of MTJ(magnetic tunnel junction) and read/write circuit based CMOS(complementary metal oxide semiconductor) were discussed. The recent achievements in anti-radiative hardening design for MRAM were summarized. The development prospect of anti-irradiation MRAM in aerospace field and even nuclear energy field was prospected.
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Overview of cognitive electronic warfare
HUANG Zhitao; WANG Xiang; ZHAO YuruiHUANG Zhitao; WANG Xiang; ZHAO Yurui.Overview of cognitive electronic warfare[J].国防科技大学学报,2023,45(5):1-11AbstractCognitive electronic warfare is usually defined as a form of electronic warfare that is based on electronic warfare equipment with cognitive performance and focuses on autonomous interactive electromagnetic environment learning capability and dynamic intelligent confrontation task processing capability. Since it was first proposed, it has attracted extensive attention from researchers and scholars at home and abroad for its advantages of accurate perception, strong reasoning and fast decision-making. With the continuous emergence of new concepts, technologies and applications of artificial intelligence, cognitive electronic warfare has stepped into a brand new stage of development. In order to capture its future development direction, the connotation of the concept of cognitive electronic warfare was summarized and enriched from the perspective of artificial intelligence, the development of cognitive electronic warfare and typical foreign projects were sorted out, the framework and architecture of cognitive electronic warfare system was built, a comprehensive and systematic review of the key technologies of cognitive electronic warfare was conducted from the aspects of perception, judgment, decision-making, etc., and the challenges and development trends of cognitive electronic warfare were summarized.
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Overview of GNSS/INS ultra-tight integrated navigation
NI Shaojie; LI Shiyang; XIE Yuchen; DENG DingNI Shaojie; LI Shiyang; XIE Yuchen; DENG Ding.Overview of GNSS/INS ultra-tight integrated navigation[J].国防科技大学学报,2023,45(5):48-59AbstractGNSS/INS ultra-tight integrated navigation system has become a research hotspot in the field of integrated navigation due to its high positioning accuracy, excellent dynamic performance and strong anti-jamming ability. The principle of GNSS/INS ultra-tight integration was introduced, and the advantages and features of ultra-tight integration mode relative to other integration modes were compared based on the analysis of the technical principle. The domestic and international research status was introduced, represented by ultra-tight integration under high dynamics and MIMU/GNSS ultra-tight integration. The key technologies such as fault-tolerant control technology, neural network assistance, and multi-sensor assisted ultra-tight integration were summarized, and the prospect of GNSS/INS ultra-tight integration towards low cost, high precision and strong stability was prospected.
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Survey on converged networks of high-performance computing network and data center network
LU Pingjing; DONG Dezun; LAI Mingche; QI Xingyun; XIONG Zeyu; CAO Jijun; XIAO LiquanLU Pingjing; DONG Dezun; LAI Mingche; QI Xingyun; XIONG Zeyu; CAO Jijun; XIAO Liquan.Survey on converged networks of high-performance computing network and data center network[J].国防科技大学学报,2023,45(4):1-10AbstractWith the convergence trend of high performance computing, big data processing, cloud computing and artificial intelligence computing, the converged network of high-performance computing network and data center network becomes an important trend. The current research status of converged network was analyzed, and the representative converged networks were described in detail to comprehensively show the latest technologies and trends. The challenges faced by the converged network were put forward, and the trends of converged network were proposed, including the convergence and differentiation coexistence of the converged network protocols, the performance acceleration of the converged network based on in-network computing, and the performance optimization of the converged network for emerging applications.
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SHEN Jianghua; ZHOU Yuting; WANG XiuxiaSHEN Jianghua; ZHOU Yuting; WANG Xiuxia.Research progress in damage mechanism of nickel-based single crystal superalloys under service conditions[J].国防科技大学学报,2023,45(4):55-65
AbstractIn order to improve the service life of nickel-based single crystal blades and solve the key technology of aeroengine turbine and gas turbine, domestic and overseas researchers carried out a large number of research on the failure and damage mechanism of nickel-based single crystal superalloys under service conditions in recent years. The research achievements and progress of fatigue, creep and thermomechanical fatigue damage mechanism of nickel-based single crystal superalloys under service conditions were concluded. In addition, in view of the time and cost increase caused by a large number of experiments, the research works and achievements in life prediction methods of nickel-based single crystal superalloys in recent years were summarized, and the difficulties and challenges in life evaluation and failure analysis of nickel-based single crystal superalloys were proposed.
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Research progress of operational reliability of civil aircraft
FENG Yunwen; LIU Jiaqi; PAN Weihuang; LU ChengFENG Yunwen; LIU Jiaqi; PAN Weihuang; LU Cheng.Research progress of operational reliability of civil aircraft[J].国防科技大学学报,2023,45(4):66-93AbstractBased on the technical status and development trend of civil aircraft operation reliability research, the requirements of civil aircraft operation reliability research were expounded according to the current type design, development and actual situation of in-service aircraft. By reviewing the research progress and engineering application status of civil aircraft operational reliability theory, the research status and problems of civil aircraft operational reliability are elaborated from six aspects:operation data acquisition and processing, operational reliability analysis method, operational reliability prediction feedback technology, optimization design based on operational reliability, optimize maintenance tasks, and comprehensive management platform for operational reliability. The future development direction of operation reliability research of civil aircraft is prospected.
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Progress in internal wave theory for two-layer and three-layer fluid systems
ZHAO Binbin; ZHANG Tianyu; DU Hui; DUAN Wenyang; WANG ZhanZHAO Binbin; ZHANG Tianyu; DU Hui; DUAN Wenyang; WANG Zhan.Progress in internal wave theory for two-layer and three-layer fluid systems[J].国防科技大学学报,2023,45(4):124-135AbstractInternal waves, occurring in stratified ocean, are ubiquitous in the world oceans. It is of great significance for our country′s marine development to study the generation and evolution of internal waves. Based on the internal wave theory of two-layer and three-layer fluid systems, the KdV(Korteweg-de Vries) internal wave theory, MCC(Miyata-Choi-Camassa) internal wave theory, HLGN(high-level Green-Naghdi) internal wave theory and Dubreil-Jacotin-Long internal wave theory, which were widely used at home and abroad, were selected to review their research progress. The advantages and limitations of different internal wave theories were discussed from mathematical models, theoretical research and numerical simulations. In the view of mathematical derivation, it is proved that MCC internal wave theory is equivalent to the first-level HLGN internal wave theory.
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JIANG Chuanjin; REN Yongjie; TONG Yiheng; XIE Yuan; CHU Wei; LI XiuqianJIANG Chuanjin; REN Yongjie; TONG Yiheng; XIE Yuan; CHU Wei; LI Xiuqian.Current status and trend of dynamic atomization characteristics of swirl injector under oscillating environment in liquid rocket engines[J].国防科技大学学报,2023,45(3):1-19
AbstractIn order to master the atomization characteristics of oscillating spray and its relationship with unstable combustion, research and development of gas-liquid coaxial swirl injectors and liquid-liquid coaxial swirl injectors, which are widely used in liquid rocket engines, are reviewed from three aspects of excited oscillation, self-pulsation, and interactions of spray oscillation with combustion stability, so as to deepen our understanding of them. According to the review, for the excited oscillation, the research on the upstream pressure oscillation caused by flow oscillation of supply system under normal temperature and pressure conditions is relatively sufficient. However, the research on the backpressure oscillation caused by pressure oscillation in the combustion chamber and the research on the excited oscillation of spray under supercritical conditions are lack. For the self-pulsation, the current research is focused on the liquid-centered coaxial swirl injectors. There are few studies on the gas-centered coaxial swirl injectors and liquid-liquid coaxial swirl injectors. The optical diagnosis technology is far from enough to extract the single combustion flow field information.
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Research progress of energy and actuation technology for micro-soft robots
YANG Yun; LIN Zening; HONG Yang; JIANG Tao; SHANG Jianzhong; LUO ZirongYANG Yun; LIN Zening; HONG Yang; JIANG Tao; SHANG Jianzhong; LUO Zirong.Research progress of energy and actuation technology for micro-soft robots[J].国防科技大学学报,2023,45(3):76-85AbstractMicro-soft robots with high compliance, low energy consumption and high energy density have wide application prospects in complex environments such as pipeline maintenance and battle field reconnaissance. Energy and actuator play a decisive role in the motion modes and performances of micro-soft robots. In order to make more researchers understand the research progresses of the existing flexible driving technology and their energy sources, the typical driving methods based on physical energy driving, chemical energy driving and biological hybrid driving were summarized and analyzed. The shortcomings and future development of the existing flexible driving technology and their energy sources were discussed and summarized, which can provide reference for the development and improving performance of the flexible drive technology of soft robots in the future.
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Review of the detection and removal methods of raindrops attached to the lens surface
LI Zhong; OUYANG Bin; QIU Shaohua; CUI Xiaopeng; XU XinghuaLI Zhong; OUYANG Bin; QIU Shaohua; CUI Xiaopeng; XU Xinghua.Review of the detection and removal methods of raindrops attached to the lens surface[J].国防科技大学学报,2023,45(3):146-160AbstractVisual system is an important part of autonomous unmanned system. The raindrops attached to the surface of the camera lens will produce artifacts in the image, resulting in the degradation of image quality, which will significantly affect the performance of the visual system. The detection and removal methods of attached raindrops in recent years were comprehensively and deeply researched. The essence of the problem was condensed, and the existing raindrop imaging models were summarized. Different technical methods were sorted out from three directions:model-based, data-driven and camera system-based, then the development of deep network model was summarized from two aspects of network architecture and loss function. The existing datasets of attached raindrops were summarized, and the performance of some algorithms was compared through the experimental results. The main problems in the task of raindrop detection and removal were discussed, and the possible development direction in this field was prospected.
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Survey on key technologies of UAV advanced ground stations
XIANG Xiaojia; TAN Qin; WANG Chang; ZHOU Han; TANG Dengqing; NIU YifengXIANG Xiaojia; TAN Qin; WANG Chang; ZHOU Han; TANG Dengqing; NIU Yifeng.Survey on key technologies of UAV advanced ground stations[J].国防科技大学学报,2023,45(2):1-14AbstractThe novel UAV (unmanned aerial vehicle) ground station with advanced control capabilities such as immersive display, intelligent assistance, and naturalized human-computer interaction has become a hot research topic in the field of UAV control. To analyze the technical aspects, the functional points and designs concepts of a series of advanced ground stations for UAVs at home and abroad were systematically compared. The technical system composition from the OODA (observe, orient, decide and act) loop of UAV ground station command and control were summarized and refined. The key techniques such as task environment construction, battlefield situation immersive display, intelligent assisted decision and naturalized human-computer interaction were analyzed and pointed out. The main research methods of various techniques were deeply analyzed, and the current challenges and future development trends of UAV advanced ground stations were also studied and judged. In addition, it provides guidance and reference for the development of novel ground stations.
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Review of visual-inertial navigation system initialization method
LIU Zhe; SHI Dianxi; YANG Shaowu; LI RuihaoLIU Zhe; SHI Dianxi; YANG Shaowu; LI Ruihao.Review of visual-inertial navigation system initialization method[J].国防科技大学学报,2023,45(2):15-26AbstractVINS (visual-inertial navigation systems) solve a series of parameters required for state estimation through initialization, such as scale, gravity vector, velocity, inertial measurement unit′s bias, etc., to improve the accuracy of navigation positioning and environmental perception of the system. The initialization methods of VINS can be divided into three categories according to the sensing information fusing mode:joint initialization, disjoint initialization and semi-joint initialization. Based on the existing research work, the current mainstream initialization methods of VINS were reviewed from four aspects:basic theory, development and classification, existing methods, performance evaluation, and the future development trends were summarized, which is helpful to have a general understanding of VINS initialization methods and grasp its development direction.
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Review on the memristor based neuromorphic chips
CHEN Changlin; LUO Changhang; LIU Sen; LIU HaijunCHEN Changlin; LUO Changhang; LIU Sen; LIU Haijun.Review on the memristor based neuromorphic chips[J].国防科技大学学报,2023,45(1):1-14AbstractIn order to master the current development status and development trends of memristor based neuromorphic chips, the existing memristor based neuromorphic chips and architectures were investigated. The memristor array structure and integration process, anterior and posterior neuron circuits, multi-array interconnection topology and data transmission strategy used in the chip, as well as the system simulation and evaluation methods used in the chip design process were compared and analyzed. It is concluded that the current circuit design of memristor based neuromorphic chips still need to solve the problems of limited resistance states, large device parameter fluctuation, complex array peripheral circuits, small integration scale, etc. It is pointed out that the actual application of this type of chip still faces challenges such as the improvement of memristor production process, improvement of development tool support, special instruction set development, and determination of typical traction applications.
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NIU Yifeng; LIU Tianqing; LI Jie; JIA ShengdeNIU Yifeng; LIU Tianqing; LI Jie; JIA Shengde.Review on motion planning methods for unmanned aerial vehicle cooperative maneuvering flight in cluttered environment[J].国防科技大学学报,2022,44(4):1-12
AbstractThe basic principle, representative methods, and state-of-the-art research of the sub-module related research within the general framework of cooperative maneuvering flight planning from single UAV (unmanned aerial vehicle) maneuvering flight to multi-UAV cooperative planning were introduced. It mainly included real-time navigation map construction, discrete-space path planning, continuous-space trajectory planning, hybrid planning based on discrete-space and continuous-space, and multi-courses/trajectories cooperative planning. The next research directions were proposed based on the major technologies of the planning framework.
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Review of RCS measurement and imaging methods of stealth aircraft
JIA Gaowei; YIN Peng; SHAO Shuai; WANG JianfengJIA Gaowei; YIN Peng; SHAO Shuai; WANG Jianfeng.Review of RCS measurement and imaging methods of stealth aircraft[J].国防科技大学学报,2022,44(3):93-103AbstractStealth aircraft has gradually become a great power, and will continue to play an important role, making stealth technology become the key technology of aircraft design. RCS(radar cross section) measurement of stealth aircraft is a necessary step to design, manufacture and maintain stealth aircraft. The basic process of RCS measurement of stealth aircraft was reviewed from three aspects:RCS test of scaled model, outdoor RCS test of full-scale aircraft and indoor near-field test of full-scale aircraft, the theoretical basis of RCS near-field measurement of stealth aircraft was summarized, and the near-field RCS measurement technology with imaging diagnosis function was analyzed intensively. The development trend and key technologies of stealth aircraft RCS measurement were prospected, which is helpful to have a general understanding of RCS measurement of stealth aircraft and grasp the development direction of RCS measurement.
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XIAO Fei; MA Weiming; LUO Yifei; LIU Binli; JIA Yingjie; LI XinXIAO Fei; MA Weiming; LUO Yifei; LIU Binli; JIA Yingjie; LI Xin.Review of dynamic characterization research of high power IGBTs and their combinations under multiple time scales[J].国防科技大学学报,2021,43(6):108-126
AbstractBased on demand of multiple time scale dynamic characterization of power electronic devices and their combination, the recent research progress and achievements on the widely used full-control power electronic devices—IGBTs(insulated gate bipolar transistors), were analyzed systematically, including the multiple time scales electro-thermal modeling of high power IGBTs and their combinations, quantitative failure evaluation methods based on the multiple time scales model and the assisted multi-rate simulation method. Furthermore, applications of the models were introduced in power electronic instruments design. In conclusion, the dynamic characterization method of high power IGBTs and their combinations under multiple time scales were presented from four aspects of modelling method, reliability evaluation, simulation method and application design, which can bring theoretical and technical support of power electronic devices to precise design of power electronic hybrid system.
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Review on two-dimensional trajectory correction projectile and its guidance and control technology
XING Bingnan; DU Zhonghua; DU ChengxinXING Bingnan; DU Zhonghua; DU Chengxin.Review on two-dimensional trajectory correction projectile and its guidance and control technology[J].国防科技大学学报,2021,43(4):53-68AbstractIn view of the wide application prospect of intelligent ammunition, the development of two-dimensional trajectory correction projectile, main correction mechanism scheme and guidance control technology were summarized. The development process of the two-dimensional trajectory correction projectile was reviewed, aiming to reveal the development principle. Several main correction schemes were discussed, and the function characteristics and research difficulties of each mechanism were analyzed. Based on the requirements of the two-dimensional trajectory correction projectile, the research status of its control technology was summarized from three aspects:aerodynamic identification and state estimation algorithm, parameter optimization algorithm and guidance law. The rapid development of intelligent algorithm in recent years, especially the application of neural network theory in the field of control algorithm was focused on. The main technical difficulties and the future development direction of the control research of the two-dimensional trajectory correction projectile, which provides ideas for the design, were pointed out.
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Current status and trend of UAV swarm communication payload technology based on free space optical
SU Shaojing; TONG Xiaozhong; WEI Junyu; WU PengSU Shaojing; TONG Xiaozhong; WEI Junyu; WU Peng.Current status and trend of UAV swarm communication payload technology based on free space optical[J].国防科技大学学报,2021,43(4):118-127AbstractThe application requirements of UAV (unmanned aerial vehicle) swarm communication payload technology based on FSO (Free Space Optical) were summarized, and the current status of FSO technology and application at home and abroad UAV payloads was discussed. The development prospect of the payload technology of UAV swarm based on FSO communication in high-speed mobile communication environment was also analyzed. Furthermore, a profound analysis on the key technologies in FSO communication links applied to UAV swarm was conducted. Predictably, FSO-based communication payload will be used widely for wide-bandwidth communication networking of UAV swarm in the future.
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Review of layerwise theory for composite materials laminated structures and its applications
SHEN Haijun; LI WeiSHEN Haijun; LI Wei.Review of layerwise theory for composite materials laminated structures and its applications[J].国防科技大学学报,2021,43(3):1-14AbstractLayerwise theory, proposed by Reddy, is a 3D analysis method for accurately analyzing composite laminated plates and shells. Without introducing any deformation and stress hypothesis, layerwise theory, compared with the classical equivalent single layer theories, has greater advantages for static and dynamic responses analysis of thick composite laminated plates and shells, especially for local interlaminar effects analysis. A review and recent research progress of the layerwise theory were presented, and its numerical solutions and applications were demonstrated as well. The basis of layerwise theory and its recent development were introduced. The implementation of layerwise finite element method and its refined models were discussed. The employment of layerwise theories for conducting static and vibration analyses and the damage model analysis of composite laminated plates and shells were outlined. And several future research trends were recommended in the end.
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Research progress and application of thermal fluid platelet devices
YIN Liang; LIU WeiqiangYIN Liang; LIU Weiqiang.Research progress and application of thermal fluid platelet devices[J].国防科技大学学报,2021,43(3):15-22AbstractThe platelet technology has been in rapid development because of several features, including the special structure of flow channel, the precise size and location, and can provide solutions to difficult thermal and fluid flow problems. As a result, the platelet technology is a major technological innovation in the history of science and technology. The characteristics and development of platelet fluid devices were briefly introduced. Some typical new applications at home and abroad in recent years, such as platelet injector, platelet transpiration cooling nose-tip, platelet fluid mixer, platelet thruster of high speed ship and platelet muffler were summarized. Finally, the correlation of processing of platelet technology and 3D printing technology was described.
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LUO Shibin; LIU Haiqiao; HU Maoqing; DONG JingLUO Shibin; LIU Haiqiao; HU Maoqing; DONG Jing.Review of multi-modal image matching assisted inertial navigation positioning technology for unmanned aerial vehicle[J].国防科技大学学报,2020,42(6):1-10
AbstractHigh-precision positioning and navigation in GPS(global positioning system) denied environments is a key technology for aircraft achieving autonomous scout, cruise, and strike. Vision navigation has the advantages of passive-type, low cost, and avoidable accumulated errors avoidable, etc. The fusion of vision and inertial navigation can give full play to their advantages and achieve the purpose of high-precision positioning. Firstly, the development of aircraft positioning technology based on multi-modal image matching assisted inertial navigation was summarized. Then this technology was elaborated in five aspects:the vision-internal calibration, multi-modal image matching, attitude algorithm, data fusion, and back-end optimization. Finally, four possible future directions were proposed as follows, two types of passive positioning combined navigation systems based on deep learning, multi-modal image matching and inertial navigation. The four possible future directions provide a reference for realizing multi-modal image matching assisted inertial navigation aircraft positioning technology.
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ZHENG Wei; LI Zhaowei; WU FanZHENG Wei; LI Zhaowei; WU Fan.Research progress of the underwater gravity-aided navigation based on the information of aerospace-marine integration[J].国防科技大学学报,2020,42(3):39-49
AbstractThe accurate navigation of the underwater vehicle plays an important role in the process of the ocean utilization and development. The problem of restraining the accumulation errors of the underwater navigation over time was discussed and analyzed in detail. Firstly, the development history of the inertial devices was briefly described. Secondly, the advantages and disadvantages of each navigation system were compared in detail, the research status of the gravity-aided navigation at home and abroad were introduced, and the demand for the high-precision navigation of the underwater vehicles and the scientific problems of insufficient spatial resolution of the global marine gravity reference map were analyzed. Finally, the idea and technical route of obtaining the high spatial resolution and high precision global marine gravity reference map by GNSS-R altimetry constellations are proposed in order to improve the accuracy of the underwater gravity-aided navigation.
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A survey of the techniques of volume rendering for large-scale scientific data
WANG Huawei; HE Liu; CAO Yi; XIAO LiWANG Huawei; HE Liu; CAO Yi; XIAO Li.A survey of the techniques of volume rendering for large-scale scientific data[J].国防科技大学学报,2020,42(2):1-12AbstractVolume rendering is an effective method to visualize complex physical features in large-scale scientific data with high expressiveness, the difficulties in processing huge amount of data and capturing complex features, however, are still a great challenge to volume rendering. To address the challenges and improve efficiency and effect of volume rendering, researchers conducted in-depth research on volume rendering algorithms from three aspects. On the one hand, it is an effective way to improve the efficiency of volume rendering by sharing computation with lots of processor cores so as to reduce the computational amount of one processor core. On the other hand, by fully exploring the intrinsic characteristics of three-dimensional data fields, data reduction methods can greatly decrease the amount of data in the rendering process and thus reduce the overhead of a volume rendering algorithm. In addition, feature analysis and enhancement techniques can also be integrated into volume rendering algorithms, thus complex physical features are highlighted from the data fields and high-quality rendering of scientific data is achieved. A survey of recent advances on volume rendering techniques was presented and various research methods were analyzed. In the end, this paper makes prospection for future research directions on volume rendering of large-scale scientific data, including application-driven feature volume rendering, feature-based data reduction in volume rendering, hardware-adapted multi-level acceleration of volume rendering and in-situ intelligent volume rendering.
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Research progress of supercontinuum laser source
YANG Weiqiang; SONG Rui; HAN Kai; HOU JingYANG Weiqiang; SONG Rui; HAN Kai; HOU Jing.Research progress of supercontinuum laser source[J].国防科技大学学报,2020,42(1):1-9AbstractAlong with the maturity of high-nonlinearity optical fiber manufacturing technology and the improvement of the performance of fiber lasers, the supercontinuum sources have entered a period of rapid development. Supercontinuum generation by using optical fibers as the non-linear media has become a research hotspot. The technical schemes and recent progress of supercontinuum generation were been reviewed from three different bands:visible, near-infrared and mid-infrared. At present, the output power of the visible and near-infrared supercontinuum sources broke through 100 W. At the same time, many new schemes such as supercontinuum generation in multi-core photonic crystal fibers, fiber amplifiers and random fiber lasers were developed. The output power of mid-infrared supercontinuum generation by using fluoride and tellurite fibers as non-linear media, also reached 10 W. The output spectrum of supercontinuum generation with chalcogenide optical fibers as non-linear medium was extended to more than 12 μm.
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Advanced imaging and detecting technology for precision guidance
LUO Chenggao; DENG Bin; CHENG Yongqiang; WANG Wenpeng; WANG Hongqiang;WANG ZhanLUO Chenggao; DENG Bin; CHENG Yongqiang; WANG Wenpeng; WANG Hongqiang;WANG Zhan.Advanced imaging and detecting technology for precision guidance[J].国防科技大学学报,2019,41(5):174-184AbstractThe history of precision guidance technologies was reviewed, and the challenges and main developing trends of imaging and detecting technologies for precision guidance were illustrated. Combined with the recent developments of the emerging technologies such as terahertz, quantum and metamaterial, the backgrounds, developing venation, basic principles and advantages of three typical advanced imaging and detecting technologies, namely, terahertz radar, quantum radar and metamaterial radar were expounded. These advanced techniques may have the potential to provide feasible approaches for precision guidance technology to overcome the challenges brought by the future new warfare form. The analysis results will provide some positive guidance and is of significance for improving the strike and intercept effectiveness of the precision guided weapon systems.
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Definition and measurement of system complexity
DUAN Xiaojun; YIN Yimin;GU KongjingDUAN Xiaojun; YIN Yimin;GU Kongjing.Definition and measurement of system complexity[J].国防科技大学学报,2019,41(1):191-198AbstractComprehension of complexity is one of the key challenges in science and technology. Complexity is a very important conception in interdisciplinary systems science, and is significant to researchers. The basic semantic background on system complexity was presented and the various definitions of complexity domestically and overseas were analyzed. On the basis of the classification of ontology and epistemology, a taxonomy of complexity was described on the basis of the state-of-the-art works on complexity definition. Meanwhile, a category of complexity measurements and the corresponding mathematical tools were proposed. Examples were given for the efficiency of complexity classification and measures.
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Research progress in controlling femtosecond laser filamentation in atmosphere
NIE Jinsong;HU YuzeNIE Jinsong;HU Yuze.Research progress in controlling femtosecond laser filamentation in atmosphere[J].国防科技大学学报,2018,40(4):1-8AbstractUnder the dynamic equilibrium among diffraction, dispersion, Kerr effect and multiple photons ionization, a self-guiding filament formed by femtosecond laser with long propagation distance can be constructed, which is accompanied by a narrow plasma channel. In order to control the propagation features of filamentation explicitly in air, a way to effectively regulate filamentation propagation modes and spatio temporal distributions has become a research hotspot. On the basis of introducing the physical model of filamentation briefly, a general overview of controlling filamentation divided by two parts was presented in this review: temporal modulations and spatial modulations. In particular, the latter consists of modulations designed by phase, amplitude and special beams. Our findings suggest that unique filaments controlled by initial modulations can offer advantages and fundamentals for the realization of numerous potential applications.
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Current status and prospect for the method on reliability analysis of hull structures in-service
HUA Lin; WU Fan; LYU Yansong;MU JinleiHUA Lin; WU Fan; LYU Yansong;MU Jinlei.Current status and prospect for the method on reliability analysis of hull structures in-service[J].国防科技大学学报,2018,40(4):173-180AbstractAs the key technology of reliability evaluation for hull structure in-service, the merits of the reliability assessment theories determines the effectiveness and confidence level of the reliability evaluation result directly. The development course and current research situation of traditional reliability assessment theories and non-probabilistic reliability assessment theory were elaborated in the view of calculation principle, computing of measurement index and engineering application. Simultaneously, the advantages and disadvantages of all current reliability assessment theories that applied in hull structure in-service were analyzed and summarized. The future research outlook was developed and the focus in the study of hull structure reliability was outlined.
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Survey of alert-correlation based on network threat detection techniques
WANG Yijie; CHENG Li;MA XingkongWANG Yijie; CHENG Li;MA Xingkong.Survey of alert-correlation based on network threat detection techniques[J].国防科技大学学报,2017,39(5):128-138AbstractThe rapid development of the Internet also causes more and more network threats. How to detect the network threats in a real-time and accurate manner becomes one of the key technique issues. The alert-correlation-based network threat detection technique is becoming the research hotspot, which couples with the widely used security products and fully exploits the relation between abnormal events to reconstruct the attack scenario. Starting from the features of network threats and security environment, the requirements and classification of network threat detection were introduced. Then the basic concepts and system model of alert-correlation-based network threat detection technique were illustrated in detail. The key module of the model, aler correlation method, and the fundamentals and features of different kinds of typical algorithm were studied in detail, including causal-relation-based method, case-based method, similarity-based method and data-mining-based method. Furthermore, three kinds of representative detection system architectures were discussed with practical instances, namely centralized architecture, hierarchical architecture and distributed architecture. Finally, based on the analysis of recent research work, the future work is discussed and outlined.
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A survey of gliding guidance methods for hypersonic vehicles
PAN Liang; XIE Yu; PENG Shuangchun; XU Mingliang;YUAN TianbaoPAN Liang; XIE Yu; PENG Shuangchun; XU Mingliang;YUAN Tianbao.A survey of gliding guidance methods for hypersonic vehicles[J].国防科技大学学报,2017,39(3):15-22AbstractThe basic problem of gliding guidance for hypersonic vehicles was proposed, and the difficulties of complicated multiple constraints, maneuver requirements, and parameter perturbation in the course of gliding guidance were analyzed. The corresponding research status at home and abroad was surveyed, and the problems were also pointed out. On this basis, the key problems required to be solved at present in the research of gliding guidance for hypersonic vehicles were presented, and the research hotspots in the methods of future gliding guidance were also pointed out.
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HUANG Min; WANG Zhongwei;GUO ZhenyunHUANG Min; WANG Zhongwei;GUO Zhenyun.Wind tunnel based virtual flight testing system and key technologies for the evaluation of flight control system[J].国防科技大学学报,2017,39(2):1-8
AbstractIn order to provide a guide for specific investigations on WTBVFT(wind tunnel based virtual flight testing) techniques, the test system and key technologies of WTBVFT for the evaluation of FCS (flight control system) were analyzed. Based on the deficiencies of the traditional FCS evaluation methods, the advantages of WTBVFT for evaluation of FCS were analyzed. According to the common constitution of attitude control loop and guidance control loop used by FCS, the test system and working principle of WTBVFT for FCS evaluation were presented. The main differences between the WTBVFT system and the hardware-in-the-loop simulation system were analyzed. The key technologies of WTBVFT for FCS evaluation were also analyzed, including WTBVFT evaluation methods, aircraft model design technique, FCS modification technique, and model support technique.
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Electromagnetic launch technology
MA Weiming;LU JunyongMA Weiming;LU Junyong.Electromagnetic launch technology[J].国防科技大学学报,2016,38(6):1-5AbstractElectromagnetic launch technology is an inevitable trend among methods of launch in the future. The principle and technology characteristics of electromagnetic launch is analyzed, three branches of electromagnetic launch technology development overseas in electromagnetic ejection, electromagnetic railgun and electromagnetic pushing were studied, and the key technology of electromagnetic launch was summarized. Furthermore, the development strategy and the extension application prospect of electromagnetic launch technology was proposed.
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Review of the interdependent networks
LAO Songyang; WANG Junde;BAI LiangLAO Songyang; WANG Junde;BAI Liang.Review of the interdependent networks[J].国防科技大学学报,2016,38(1):122-128AbstractIn recent years, the network dependency and interdependent networks have become a research hotspot in the field of complex network, but literature about the overview of related research progress is still very rare. Based on the systematic research of domestic and overseas literatures, the percolation theory of the interdependent networks was briefly introduced, and the cascading failure process of the interdependent networks was described. Then the related progress was summarized from three aspects that can affect the robustness of interdependent networks: characteristics of sub network, type of dependency edge, the combination of sub networks. Finally, the future development direction of interdependent networks was prospected in both theoretical and practical aspects.
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YANG Xixiang; YANG Huixin;WANG PengYANG Xixiang; YANG Huixin;WANG Peng.Overview of pseudo-spectral method and its application intrajectory optimum design for flight vehicles[J].国防科技大学学报,2015,37(4):1-8
AbstractTrajectory optimum design for flight vehicles using pseudo-spectral methods has been a hot research direction in recent years, but studies about the overview of this field are very few. Based on the systematic research of domestic and overseas related literatures, the basic principles of several pseudo-spectral methods which have a wide range of applications in aerospace field were expounded; the thoughts and formulas for transforming continuous optimal control problems into nonlinear programming problems were concluded; the applications of pseudo-spectral method in the trajectory optimum design for flight vehicles were summarized; the development directions of pseudo-spectral method and its application in trajectory optimization design for flight vehicles were discussed.
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Development status and tendency of active debris removal
CAO Xibin; LI Feng; ZHANG Jinxiu;Richard MurielCAO Xibin; LI Feng; ZHANG Jinxiu;Richard Muriel.Development status and tendency of active debris removal[J].国防科技大学学报,2015,37(4):117-120AbstractWith the increase of domestic and foreign launching tasks, it is becoming a serious challenge that plenty of failure or invalid spacecrafts in the process of space resources recycling. The active debris removal can be regarded as an effective and fundamental means that can realize the reuse of space resources and safe disposal. The concept of active debris removal is clarified and its development process also is analyzed. Some key techniques, such as relative navigation, coordinated control, capture method and device for non-cooperative target, are proposed. It will provide some fruitful reference for our country′s active debris removal in future.
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Research and application progress on underwater terrain-aided navigation technology
ZHANG Jingyuan; SHEN Jian; LI Heng;RAO ZheZHANG Jingyuan; SHEN Jian; LI Heng;RAO Zhe.Research and application progress on underwater terrain-aided navigation technology[J].国防科技大学学报,2015,37(3):128-135AbstractBased on brief introduction of the conception of underwater terrain-aided navigation, the key problems and research progress of underwater terrain-aided navigation were introduced from the view of terrain aided navigation algorithm, underwater digital map technology, and experimentation. The direction of research and development of application was pointed out as well.