Abstract:The telemetry, tracking, and command (TT&C) network is one of the key issues for regional navigation satellite system. Firstly, the domestic deployment of TT&C stations was discussed. The observability on navigation satellite constellation based on domestic stations was analyzed by means of grid computation. Then, the observing geometric structure intension on satellites was synthesized by the position dilution of precision (PDOP), and the influence of the station's location on satellite orbit determination precision was valuated by the condition number of normal matrix. The simulation shows that the TT&C stations located in the limited span of Chinese territory and the existing TT&C resources can accomplish the TT&C task. Finally, the setting of stations abroad was considered and simulated, and it verified that the joining of the stations abroad, such as the station in Perth in Australia, can improve the observing geometric structure intension and satellite orbit determination precision.

Abstract:This paper first analyzed the ground test and control system architecture and its characteristics of the missile control system based on the bus. Then it made an explanation to the structure and BIT technique of a single component. Furthermore, it put forward the method of the monitor and fault diagnosis of missile control system based on the bus, in which the formats of bus data interface, the expression of system knowledge and the process of monitor and fault diagnosis were mainly discussed.

Abstract:The shocklet was observed based on NPLS techniques in supersonic turbulent mix layer wind tunnel with convective Mach number 1.24. The flow field parameters of mix layer were analyzed with the appearance of shocklet. The method of calculating convective Mach number from experiment image was presented with the consideration that it can avoid unnecessary hypothesis of theory. Finally, the generation and development of shocklet structure were discussed.

Abstract:A method based on the sensitivity analysis and quasi-steady state assumption was systematically developed in this paper to simplify complex reaction mechanisms. A constant pressure homogeneous reactor model and a detailed reaction mechanism were adopted to calculate the auto-ignition process under the interested condition. Then the result obtained with the detailed mechanism was analyzed through the sensitivity analysis and the redundant species and reactions were identified and deleted from the detailed mechanism to form the skeletal mechanism. After that, the quasi-steady state species (QSSS) which were very small and fast were also found from the skeletal mechanism. The global reaction mechanism was derived with some matrix relations from the skeletal one. Finally, the detailed mechanism GriMech1.2 for methane oxidization was simplified to form skeletal and global mechanism as an example, and the result was validated with a comparison with the one obtained with the detailed mechanism.

Abstract:Several space physics missions that are being designed or flown need spacecrafts flying in a tetrahedron configuration about a highly elliptical reference orbit. At least four spacecrafts can separate space and time, and measure the structural and dynamic parameters of space environment along the mission arc. Based on the orbit element model of relative motion, an analysis was performed to study the influence of four reference orbit elements on the tetrahedron's quality factor and average side length. On the assumption that one spacecraft runs along the reference orbit, a tetrahedron formation optimization design model was proposed, whose design variables are fifteen relative orbit elements of the other three spacecrafts while objective function involves the tetrahedron's quality factor and mean side length. Then, this model is applied in phase I of Magnetosperic MultiScale mission. The results show that a tetrahedron formation with better performance in the mission arc can be found through optimization method while no control is exerted.

Abstract:A new reusable launch vehicle (RLV) entry guidance algorithm with ranging technique which only needs to update flight profile parameters was developed and a predictor-corrector entry guidance methodology using Runge-Kutta-Fehlberg method for RLVs combined with trajectory online generation technology was studied. Comparisons between the two guidance schemes were performed, and simulation results show that the two guidance methods are feasible, which indicates that the integration of reference-trajectory entry guidance and predictor-corrector entry guidance is a promising entry guidance scheme for future RLVs.

Abstract:A flight controller structure based on RBF NN was designed,and its control law and tunned law for RBF NN parameters.(center and width of gauss function, weight) were presented. F8 Fight aircraft was taken as the control object and a simulation was thus performed. The results from simulation show that, even under 70% model error, this controller manifests excellent control performance and good robustness. Fully-tunned law presented in this paper is better than the conventional algorithm which only adjusts weight value of RBF NN.

Abstract:The performance of water-ramjet engine was calculated by the thermodynamic calculation software, then the basic composition of the magnesium-based hydro-reactive metal fuel was determined and the fuel grain was produced. The model water-ramjet engines with the fuel have been tested successfully. The performance of the engine and the attributes of the fuel were investigated primarily.

Abstract:Timing control system is the important element for Magnetic Flux Compression Generator (MFCG)'s operation. This paper introduced the operating principle of classical timing control system using flat switch along with an analysis of its merits and drawbacks. Then it improved the classical timing control system by means of theoretic and experimental study, and designed a kind of timing control system, which used primacord and solidified coaxial switch. Furthermore, the explosive velocity of primacord and opening time of solidified switch were measured. Finally, the system in the experiment of MFCG was verified.

Abstract:Data compression is a key problem in the applications of hyperspectral images. Based on the correlation analysis of hyperspectral data, a multi-predictors compression scheme of hyperspectral images was presented. The new scheme was applied to single band and multi bands prediction. Two lossless compression methods with different complexity were achieved. Simulation results verify the effectiveness of the scheme.

Abstract:There is a growing interest in the frequency modulated continuous wave (FM-CW) SAR for its advantages such as small cubage, light weight, cost-effective and high resolution. In this paper, imaging process in range direction was analyzed in detail, and a useful conclusion was drawn that the RVP is removed in the course of performing Fourier transform in range direction; Then, the factors affecting range resolution for the de-chirped FM-CW SAR was discussed，and the method improving the range resolution as well as decreasing the range sample frequency was put forward. The deduction of the process shows that the slope factor exists in FM-CW SAR. Therefore, the generation of the slope factor and the method of de-sloping were analyzed, and the corresponding range imaging algorithm was also presented, creating better focus conditions for the azimuth direction.

Abstract:Observability analysis is the basic and prime task in passive localization and tracking system, for only when the system is observable, it can be determined with unique and definite solution. In this paper, the observability for two kinds of typical maneuvering motion (constant acceleration and constant turn rate motion) is analyzed from the perspective of linear system theory, utilizing the integrated information of target's angle of arrival and Doppler frequency. This may lay the theoretic foundation for further research of maneuvering target localization and tracking. Finally, two simulation instances are presented to demonstrate the mathematical derivation and the results are consistent with those concluded from theoretic analysis, indicating that the method is correct and valid.

Abstract:PN code capture is a difficult problem in radio reconnaissance and navigation warfare. The PN code capture under self-jamming code was studied from the point view of pattern recognition theory. The carrier frequency and phase of self-jamming code were estimated and compensated firstly. Thus the PN code capture was converted into pattern recognition problem. Combined with the periodicity of the short PN code, binary integration was introduced to reduce the SNR before decision, which made the direct demodulation of spread spectrum signals feasible without large diameter antenna.

Abstract:The design and realization of PPI signal raster scan radar display system was introduced, and the key technologies of coordinates conversion and data real-time acquisition were analyzed too. An optimal table look-up method and a real-time data acquisition technical scheme were proposed. The methods were successfully used in a PPI signal raster scan radar display system on active service, and well fulfilled the high-speed, low-memory, and real-time requirements of raster scan radar.

Abstract:To overcome the shortcoming of current web service composition modeling methods, a new web services composition process/resource model(WSCP/R-net) was proposed on the basis of the extended petri-net. WSCP/R-net resolves the problems on uncertain activity option and dynamic variation of service in process modeling effectively. Furthermore, a description of the methods to translate WSCP/R-net into BPEL4WS was made. Finally, its application was illustrated in city emergency disposal.

Abstract:Virtual surgery simulation system is one of the important tools for medical training. It can be widely applied in medical education. By the experiences in the development of the virtual surgery system for knee arthroscope, we introduce the key techniques about geometry modeling, deformation computing, mechanics feedback and special effect processing. The methods developed in this paper can be extended to other virtual surgery simulation.

Abstract:In order to process CKNN queries on the basis of TPR-tree efficiently, a new spatio-temporal distance metrics minmaxdist(t) was presented as a pruning upper bound. Also a CKNN queries algorithm STM-CNN which can search in best-first manner was developed by means of mindist(t) and minmaxdist(t) metrics, in which STM-CNN algorithm visits TPR-tree nodes according to mindist(t)order, and pruning the nodes with minmaxdist(t).

Abstract:A new TTCM direct series spread spectrum system scheme was put forward. It is based on the signal sets through expanding spread spectrum series phase. This scheme can increase the minimum Euclidean distance and improve the BER performance without any increase of the signal power, slowdown of the information speed or change of the modulation mode. The simulation results show that the proposed system can achieve 13dB coding gain more than the ordinary TCM system while increasing no sensitivity to initial phase error or the phase noise of the carrier wave.

Abstract:In terms of the formulated finite wavelet filters theory, this paper presented an iterating algorithm for the construction of two-dimensional finite wavelet filter with linear phase. The real unitary and center-symmetry matrices with size of were characterized and an important attribute of wavelet filter produced by the algorithm was proved.

Abstract:Based on the features of the information environment supporting clinical diagnosis, a multi-agent-based clinical diagnosis support system (CDSS) was designed by combining agent technology. This system possesses such characteristics as isomerism, distributing, parallelism and expansibility. It can adapt to the requirement of CDSS and efficiently improve performance of CDSS.

Abstract:To enhance the rapid response ability of manufacturing system, the machine tools' modular design oriented to reconfiguration was analyzed. Then the general idea of machine tools' reconfiguration oriented to process-capability was presented. The machine tools' reconfiguration arithmetic based on modularization was researched mostly in such aspects as ability similarity account, relativity analysis, module reconfiguration of lacking ability parameter, module reconfiguration of redundancy ability parameter, ability comparing, module displacing and ability checking up. The arithmetic was validated by the configuration and reconfiguration of machining center, which indicates the arithmetic is feasible and effective.

Abstract:This paper proposes an approach of determining the pitch, the roll and the azimuth with three mutually orthogonal accelerometers and magnetometers. The configuration of the system and the calculation of the attitude were firstly described. In order to compensate for the effects of perturbing magnetic fields associated with magnetized sections of the drill collar, a correction method of determining the azimuth which relies on the knowledge of local geomagnetic field was described in great detail. Furthermore, the correction process and simulation were presented. Results from simulation show that the correction method can determine an absolute azimuth by means of using a measuring instrument disposed in a relatively short non-magnetic drill collar, so it minimizes the length of non-magnetic drill collar and saves drilling costs greatly.

Abstract:In microarray experiments, the missing value does exist and somewhat affects the stability and precision of the expression data analysis. Compared with increasing experiments, missing value estimating is preferred in reducing the influence of missing values on the post-processing. With the kernel weight based on similarly between target gene and sample genes, which localize missing value estimation, a new method based on weighted regression is presented. On the two real microarray expression datasets, the novel method was compared with several existing methods. Experimental results show that the novel method has better stability and precision than the existing methods that have been employed.

Abstract:IA new method based on generalized maximum entropy is applied in estimating parameters of structural equation model, which is meant for situations with limited or incomplete data. A sample that is used for ACSI is used to generate simulation data in order to verify the performance of GME. The results show that GME method can achieve higher imitating precision and smaller prediction errors compared to PLS, which is prominent when the sample size is relatively small.

Abstract:By using the Taylor expansion with an integral remainder, an appropriate inner product for the space W^m₂［a，b］were introduced. Based on this inner product, simple formulas for computing reproducing kernels were obtained by using the Green's function and recursive relationships for computing reproducing kernels were also discussed.

Abstract:The positive periodic solutions of a biological model with delay were disscussed. One Sufficient condition of the existence of positive periodic solutions was obtained by using the continuation theorem of Mawhin's coincidence degree. In addition, the result on the case with infinite delay was proved to be true.

Abstract:The mechanical coupling of micromachined quartz gyroscope was studied and modeled, the relationship between output signal and mechanical coupling of gyroscope was derived by comparing and analyzing ideal and non-ideal models. The influence of mechanical coupling on parameter of gyroscope was demonstrated by simulation.