Abstract:With diversiform needs of space missions,not only minimizing fuel is required for the spacecrafts interception and orbit transformation, but minimizing time is also required.In this paper, the combinatorial optimization problem is solved by EA(Evolution Algorithm),and the algorithm proves to be effective according to the simulation results.

Abstract:The miss distance measurement for targets in rectilinear motion and with constant velocities is studied. A miss distance measurement mathematical model is established at first. Based on it, the measurement problem is represented as the nonlinear fitting of radial distance time series in the course of interceptions, and then optimizing algorithms are discussed for solving it. Simulations show that the method for miss distance measurement based on radial distance time series is simple and effective.

Abstract:Traditional missile design procedure cannot achieve synergic design of subsystems well. Multidisciplinary design optimization technique is very suitable for multidiscipline synergic design in modern computer network environment. We introduce coevolutionary algorithms to multidisciplinary design optimization based on their substantial similarity, to sufficiently employ the merit of evolutionary algorithmsin MDO. A multidisciplinary design optimization method based on cooperative coevolutionary algorithms is presented. The algorithm is applied to missile aerodynamic/engine/control multidisciplinary design optimization, and result shows it's ability in design optimization of coupled systems.

Abstract:The performance of the missiles is determined mostly by the accuracy and dispersion of the random fall points. In small samples case, it is difficult to assess respectively the accuracy and dispersion. The integration assessment approach adopting probability circle method is proposed. The performance is accepted when the number which fall into the probability circle is larger than or equal to the number predetermined, otherwise it is rejected. The producer's risk and consumer's risk are also given. Finally, the simulation shows that the approach proposed in this paper is available. Probability circle method is simple and easy for practical applications.

Abstract:Satellitestend to be micromation in future. Itis necessary to investigate small, cheap self-contained navigation system with moderate precision. According to measuring data of three-axis magnetometer in the body frame, the attitude of the satellite in low orbit can be determined through Kalman Filter. Combining the dynamical model of satellite's attitude with the standard model of the geomagnetic field,the filter model and arithmetic used to determine the attitude of the satellite are presented. The result of simulation shows that the project of three-axis magnetometer attitude determination has a certain precision, which has an applicable future in the self-contained navigation system with moderate precision attitude determination.

Abstract:The reality of human behavior model is critical for the CGF.A three-layer human behavior model based on the fuzzy rule is first proposed for one vs. one fighter dogfight and the fuzzy-flight-state controller on the bottom layer was optimized using genetic algorithms. The simulation result suggest that this model can generate human-like air combat behavior.

Abstract:The effects of different thermo-chemical air models and surface catalytic conditions on surface heat transfer are analyzed numerically. They include (1) the comparison of different high temperature air models (7 species and 11 species), (2) the comparison of chemical nonequilibrium flow with thermo-nonequilibrium (two temperature model) and thermo-equilibrium (one temperature model), (3) the comparison of different surface catalytic condition.

Abstract:A convergent iterative solution method for cables is formulated after solving the boundary problem with differential equation of a cable. By using the iterative solution, it is simple to determine the relation among the coordinate difference of cable-end position, cable tension and cable weight. The examples demonstrate that the present scheme for cable calculation can be as theoretically concise as required, and it is convenient to be used for analysing largely deformed complicated structures including cables or cable nets, and the present method makes it possible to solve the divergence problem of stress relieve of cables caused by employing some techniques such as Ernst Model for cables.

Abstract:Polycarbonsilane (PCS) synthesized from polydimethelsilane (PDMS) is an excellent precursor to ceramic materials. On the base of an indirect way involving intercurrent liquid polysilane (LPS), this paper studied a direct way to synthesis PCS from solid PDMS. By the application of orthogonal design, influence of synthesis conditions on the structure and molecular weight of PCS were studied. And the optimized synthesis condition was obtained as reaction temperature, 455℃, pyrolysis temperature, 540℃ and retaining time, 6 hours.

Abstract:The cross-linking and pyrolysis of Polysiloxane (PSO)/Divinylbenzene (DVB) is investigated in this paper. It is found that only catalyzed with H₂PtCl₆ PSO/DVB can cure completely. When cured at 120℃ for 6hrs with H₂PtCl₆, the ceramic yield of PSO/DVB, the mass ratio of which is 1∶0.5, is 76%. The viscosity at room temperature of PSO/DVB and the contact angle between PSO/DVB and carbon fiber are 10.5 mPa?s and 34 degree, which make PSO/DVB very good for the preparation of three-dimension-braided fiber reinforced ceramic matrix composites. The XRD results indicate that there are SiO₂ and β-SiC microcrystals in the product pyrolyzed at 1000℃ and 1200℃, which grow markedly above 1200℃. The content of Si, O, C in the product pyrolyzed at 1000℃ is 38.33wt%, 27.33wt%, and 34.34wt%, respectively. Most C existed as free carbon, and the rest randomly mixed with Si, O to form［Si(O,C)₄］which are converted is to［SiO₄］and［SiC₄］above 1200℃.

Abstract:This paper presents a calculation mehod of storage life for cholinesterase enzyme which is a reagent to detect organophosphorus and carbaminate pesticides or toxicants by the biochemtical method. A relational expression of the storage life to the storage temperature is obtained. This calculation method is simple, rapid, practical and reliable.

Abstract:Interference of dual sources is an effective means of counteracting passive radar seeker (PRS). In the practice，the power of dual sources is hard to be the same, so it is possible for PRS to counteract interference of dual sources. In far field, PRS will not follow the power centroid and point the higher power source of double sources as long as the number of the seeker accumulating data is large enough. It is proven by theoretical analysis and simulation experiments. And the formulation of the number of the seeker accumulating data is given.

Abstract:This paper analyzes the influence of the inversive receiver on the chracteristics of the clutter and the ratio of the signal power and the noise power ,discusses the effective detection method of the target signal in correlated clutter,and then puts forward a new method named multi-periods shift accumulation for detecting moving target when not knowing the exact movement parameter.

Abstract:The Stripmap-mode SAR is able to image larger area during the same time than the Spotlight-mode SAR. There are always some ROIs which should be emphasized in the whole SAR image. But the signature from those scatters outside the ROI will decrease the contrast of ROI's image. The digitally-spotlight algorithm is able to filter the unwanted signature before imaging to achieve the equivalent purpose to spotlight-mode SAR and increase the contrast of the SAR image. The simulation results prove its validity.

Abstract:This paper thoroceghly analyzes the three most important factors that govern the foliage penetrat capability of UWB SAR: operational frequency, polarization and resolution. Our conclusions are of significant values to the top-level design of UWB SAR.

Abstract:The content addressable memory (CAM) is a fast matching memory. It's widely used in communication and radars. In this article, new methods of CAM designing based on two series of FPGA are brought forward. Two approaches of coherent processor (CP) based on CAM are discussed. The real-time processing performance is supported by FPGA platform emulation.

Abstract:Image segmentation and target aspect estimation are very useful for automatic target recognition in SAR imagery. Based on the MRF model, we first segment the image using ICM algorithm. According to the MAP criteria, the image is segmented into target, shadow and background. Then the target pixel closest to the sensor is obtained, and we can get the primary edge and estimate the target aspect angle based on it. These algorithms are applied to SAR imagery from the MSTAR datasets, and the result is better than by other algorithms.

Abstract:The triangle-plate model of an aircraft carrier is made using 3D Studio MAX and the radar reflecting characteristics of the carrier in X band are studied. The RCS is calculated with the plate-element method. The results show that the RCS peaks appear on the prow, the stern and the two sides, which shows the radar echo is mainly caused by the mirror reflectioin.

Abstract:FDTD is playing a key role in electromagnetic field computation. Moreover, it has been demonstrated that FDTD is special case of MRTD (multiresolution in time domain) if the base function and weight function is Haar scaling function in the course of solving Maxell equations by Wavelet-Galerkin scheme. Higher-order FDTD algorithm corresponds to Haar wavelet packet function.

Abstract:A cumulant-based direction-of-arrival(DOA) matrix is proposed, whose eigenvalues and eigenvectors can be used to get the estimates of signal directions. It differs from other doa-matrix methods in that it relaxes the requirements for array geometry, makes better use of the array aperture and is based on cumulant, which makes the new algorithm insensitive to Gaussian noise.

Abstract:In high frequency region,the radar range profiles are chosen as feature vectors for target recognition.The profile is seriously affected by the bearing.In order to make the radar target recognition more sffective,the definitions of correlation length and correlation angle are given.In frequency domain,the most important feature of the shape of a profile is mainly contained in its spectral phase, but not in its spectral magnitude.So the spectral phase is important feature information for RTR(Radar Target Recognition) in high frequency region,and should be utilized effectively.

Abstract:The principle of intrusion detection system (DIDS) is introduced, and its advantages and disadvantages are analyzed. Hence, we bring out the concept of Distributed IDS, comparing the design goal with the performance of some IDS products. In the end, the designation of DIDS is discussed in detail in regard to the aspects of the functionality module designation, the retrieve and update of attack characteristics, the enhancing of the attack detection and reactivity, the correlated attack analysis, and the more active reaction policy.

Abstract:As the High level architecture of modeling and simulation (M&S)，HLA will provide the user great benefits. The key of promoting the application of HLA is the automation of federation development and execution process(FEDEP).This paper studies the feasibility, points out the issues to which special attention should be paid, focuses on the key techniques of applying the rational rose which is a powerful computer aided software engineering（CASE）tool to support the automation of FEDEP,and provides an example of application.

Abstract:Teleoperation through large time delay (T3D) is one of the key techniques for space telerobotics. How to overcome the impact of the time delay in the communication links and the limited bandwidth, is the focus in the research of T3D. In this paper, the main idea of applying Virtual Reality (VR) in T3D is discussed. The relative key problems in applying VR, including teleprogramming, and model calibration, are especially concerned. Based on the concept of supervisory control and teleprogramming, an experimental telerobotics system is implemented. The system has successfully fulfilled several tasks including the peg-in-hole task.

Abstract:A model of the automotive braking aid presented in this paper is based on Gauss-Seidel algorithm. Based on the model, a hyper-stable model reference adaptive controller for braking aid is designed for automotive collision warning system. All of the study has been carried out on a “Software & Hardware Hybrid d Platform for Simulation of Engineering Systems Using Matlab Toolbox/Simulink". The results of software and hardware simulation are quite consistent, which demonstrates the functionality and effectiveness of this system and experimental methodology for controlling the motor-speed and keeping the distance between automobiles under complicated circumstances.

Abstract:Based on numerical simulation for double-deck vehicle in crosswind with different angle of attacks, it is found that the vehicle's three areodyramic coefficients become obviously large when the vehicle running on railroad 24m free supported bridge with T configure or on embankment, compared with those of considering the vehicle only. Accordingly, the affect of enlarged wind loads acting on the vehicle should be taken seriously.

Abstract:Infrared focal plane array(IR FPA) detector has been widely used in new infrared guided system because of its outstanding performance. But the Nonuniformity of IR FPA debases the perforance of the detector. Lots of nonuniformity correction methods have been developed to solve the problem. The paper puts forward a modified method to correct the nonuniformity of IRFPA to get better infrared image.

Abstract:We make an introductory review on the optical imaging techniques based on intrinsic signals including the last achievement in this field. First, we give the general concepts and fundamental principles of optical imaging techniques based on intrinsic signals such as the definition, characteristics, classification. Then, the differences between this techniques and other optical imaging techniques of functional brain are compared. Finally, we point out possible directions for further research.

Abstract:The optical design of an optical system of an ultra-high numerical aperture is introduced. The introduction includes the point difficulties, the design considerations, the solutions and the final results. Comparing to the past optical system, it has two noted characters, that is ultra-high numerical aperture and larger quadratic aspherical surface. The optical system will be used to detect and analyze the samples of the earth or soils.