Abstract:the orbit models, the calculation methods of sub-satellite and the coverage judgement which take into account the J₂ perturbations are given first, and then an iterating methods of designing satellite orbit with repeat ground trace is proposed. The near-circle low earth orbits which repeat after 12、13、14、15 orbits per day are often chosen in designing regional partial coverage constellations, so the heights and the inclination angles of these 4 kinds orbits are listed in the end.

Abstract:This paper applies Newton iterative method to computing basic firing data of ballistic missiles efficiently. In this paper, Newton iterative formula based on deviations of dropping point is deduced and the iterative program is designed, an example is given. Considering the relationship between the convergent speed of the iterative method and the initial value of parameters, the paper brings forward a method, which provides good initial values of parameters by using a reverse interpolation method based on prepared firing tables. The actual practice indicates that the method accelerates iteration rapidly. It is possible to design a standard trajectory of ballistic missiles quickly by using the method presented in this paper.

Abstract:The quantitative method of missile simulation model validation is discussed. According to the characteristic of high accuracy of MESA, the approximate statistical property is analyzed, the consistence tests of two samples and of two normal ensembles are given respectively. It's proved by simulation that validation by MESA is feasible. An applicable example is given, to validate simulation model of homing guidance missile by MESA.

Abstract:Unsteady three-dimensional thermal analysis model of the chamber wall is used to account for the thermal protection of GO₂/kerosene ground test engine and numerical calculation is performed on its water cooling channel wall. The numerical model treats the hot gas flow and coolant flow as one dimensional. The hot gas side heat transfer and the temperature profile in the wall are obtained by finite difference method. The history of the temperature profile is also predicted by the analysis. The effect of the coolant flow rate on the temperature profile is also discussed.

Abstract:Non-uniform beam-like structures have been widely used in engineering structures to achieve an optimal distribution of strength, stiffness and modes of vibration to satisfy design requirements. In this paper, a new asymptotic method for the analysis of these systems is presented. The linear partial differential equation which governs the response of the beam and the inhomogeneous boundary conditions have been put into a state space form. Choosing the small parameterεas a perturbation parameter, the asymptotic solutions are determined by the state space technique. Numerical examples are provided to illustrate the efficiency of the method.

Abstract:A two-dimensional TVD scheme with second order accuracy in space and time is used to simulate the horizontal relative motion flowfield between wedges. Grid-embedding technique is applied to calculate the unsteady flowfield. This technique simplifies the construction of computational grids about complex geometries and allows relative motion between embedded grids.

Abstract:By applying heaviside function, the vibration equation governing the beam that possesses spatially distributed piezoelectric patches has been established. Based on this equation and using the modal method, some problems about the vibration control have been discussed. Numerical examples have been presented to illustrate the efficacy of the control to both free and forced vibration.

Abstract:In this paper, we research on spatial scatter of preformed fragmentary steel shell under detonation driving. Four different explosive charges are considered. In order to abtain a parallel fragment spatial scattering pattern, there are special requirements on the geometry of the shell and the initial velocities of the fragments. These requirements have been discussed in detail in the paper.

Abstract:The paper introduces a new type of velocity measurement system. In this system, the displacement can he changed into electronic signals with reflective stripe optoelectronic technology for the first time, the data are collected by writing the computer's memory directly and timely. The measurement results can be printed immediately. The system can provide highly accurate measurement and is easy to operate. It can be used widely.

Abstract:This paper presents a high speed test generation method specifically for very large scale combination circuit and full scan-designed circuit. This method is used together with the finite backtracing test pattern generation method to generate test code, and then simulates to validate the fault covering by means of single fault propogating method with n (machine word) test code parallelised. The mode for test generation and fault simulation is n to 1 tight coupled integrating mode. With testing the method with 10 benchmark circuits, the result is good for low test pattern length, high fault coverage and high efficiency.

Abstract:In this paper, the application of wavelet transform in image de-noise is studied. Via thresholding operation in wavelet domain of image, it can reduce noise effectively, and at the same time, with a little loss of image detail. Detail discussion of this wavelet thresholding method is presented in this paper, and some methods of threshold selection are also given. It has been proved that the wavelet thresholding technology is an effective method for image de-noise.

Abstract:A multi-scale wavelet-based algorithm for detecting and locating corners in 2D images is proposed. First using Zero-Crossing-Based 2D Edge Detector we can get the two-value edge graph; after edge linking and giving each planar curve its orientation space representation we can get the orientation curves. Based on the multi-scale wavelet transform of the orientation curves we can utilize the information of local maximum positions to detect and locate the corners. Experimental results with some synthetic and real images show that this algorithm has high precision and stability of the corner detection and location.

Abstract:This paper puts forwards a stable IIR adaptive filter, along with the nonlinear gradient algorithm concerning its coefficient iteration. Simulation results demonstrate that under high JSR circumstance, the proposed IIR filter can efficiently suppress not only the CW interference but also the partial-band NBI.

Abstract:This paper describes an algorithm of video coding based on a three-dimensional spatio-temporal subband decomposition, and results are shown for a 112kb/s coder that is based on an unbalanced tree-structured vector quantizer (UTSVQ) for the lowest frequency band and geometic vector quantizer (GVQ) for the higher frequency bands.

Abstract:A new algorithms of digital modulation recognition is presented in this article. Artificial neural networks (ANNs) are used to recognize digital modulation in this approach, which is suitable for digital modulation types including 2ASK, 4ASK, 2FSK, 4FSK, 2PSK, 4PSK. ANNs approach can automatically chose the threshold for each feature. It not only makes the classification intelligible, but also improves the success rate of classification.

Abstract:In this paper, the digital generation methods and the implementation techniques for Ultra-wideband LFM baseband signals are introduced. The two main digital methods for LFM waveform generation are firstly narrated and compared, and a generation scheme for Ultra-wideband LFM waveforms is presented according to the waveform storage method. Then, the key techniques in LFM baseband digital generation are discussed in detail. An experimental system has been implemented and tested. The results show that the scheme is feasible.

Abstract:This paper first analyses briefly the design principle of man-computer interface of Individual-Soldier Digitization System, and then discusses several types of man-computer interface. To each of them, a analysis of performance、usage、advantage and disadvantage、and possibility of implementation is given in the section。Finally, we give an idea about how to put different kinds of information and commands into different groups——information classification, and how to divide information screen space.

Abstract:This paper presents the function of the communication system used for Individual Soldier's Equipment Digitization, including its realization by way of wireless net and regional net. Joint Tractical Information Distributed System (JTIDS) is focused on as an example of the integrated information net in the digitized battlefield, including JTIDS TDMA (Time Division Multiple Address) and multiple JTIDS net-working. Finally, one of the security problems of the communication system is discussed.

Abstract:This paper discusses the principles of designing HLA/RTI architecture, communication mechanism, Run-Time Infrastructure, Object Model, and Management Object Model about distributed interaction simulation system.

Abstract:The purpose of building real-time monitor expert system of the Center Computer System of the ship for fulfilling the measuring task on sea is to improve the real-timing and reliability. Around the real-time expert system's time-order, time-variable and timing, the kernel technology to design and build this system is discussed in the paper.

Abstract:In compliance with the CORBA specification, the paper has elaborated the design of Interface Repository and the functions of the Interface Repository in Star Bus system, illustrated the contents and architecture of Interface Repository, introduced in detail the implementation of Interface Repository Service.

Abstract:Twist-roller friction drive system combining friction drive with screw drive, has many features such as good dynamic characteristic of friction drive and small lead of screw drive. This paper presents a kind of twist-roller friction drive system. Its lead is less than 0.2mm, the stroke is about 250mm, and the resolution is several nanometer. It is composed of twistroller friction drive mechanism, static air bearing guideway and relative parts. It is a new kind of drive system with large stroke and very high resolution.

Abstract:This paper presents the design of the corrugated paper synchro cutting control system. This system consists of the DC moter speed control system and the micro-computer control system. The linear quadratic optimum regulator was adoped to design the DC motor speed contrd system. The double CPUs technique of single chip microcomputer was adoped to design the computer control system. So, it's a system of great power and high precision. Rapid response, high precision, high reliability and convenient operation are characteristic of the system.

Abstract:This paper tries to eliminate guideway resonance vibration of an EMS maglev vehicle by designing a levitation control system. It mainly deals with the design of a robust state-observer, discusses the selection method of the observer's parameters. Results of simulation and experiments indicate that the guideway resonance vibration in the system is eliminated successfully and the stable levitation is realized.

Abstract:This paper develops control-oriented model's modeling, and brings forward a practical computimg met hod. This identificationmethod is characterized by time-domain. Moreover, it uses the genetic algorithmto realize modeling. The simulating result shows that the true model lies in the identified model set and this identification method has a good robust.

Abstract:This paper deals with the reliability model set of three-state component. From the static viewpoint, there are two kinds of models: (1) success, degraded, failure; (2) success, failurel, failure 2. From the dynamic viewpoint, we can give the unified reliability model of three-state component with six parameters (λ₁λ₂λ₃μ₁μ₂μ₃) when the failure rate and the maintenance cate are constant. Moreover, we can compute the probabilities of three states at any time t.

Abstract:Calculating Top-Event failure probability is an important aspect of non-coherent FTA (Fault Tree Analysis). Because of the complexity of non-coherent system, all existing algorithms can't satisfy the requirements of exactness and speediness in application. In this article, we adopt a new algorithm for calculating Top-Event failure probability of non-coherent fault tree, which is based on BDD to decompose Top-Event of the fault tree and avoid seeking PIS and the smallest cover of PIS. So the new algorithm provides a new method for solving the NP problem effectively.

Abstract:A new algorithm for computing reliability of network with node failure is presented in this paper. Based on the principle of disjoint algebra and synergetic computing, the disjoint minimal path set is gotten directly by means of node information exchanging. The algorithm is simple and characterized by distributed computing. It provides a new approach to computing reliability of large scale network.

Abstract:In this paper, the exact Bayesian estimators of mean life and reliability function for the mixture of two exponential failure distrbutions are achieced, based on the censored test data from this model. The approximate low confidence limit estimate of reliability function is obtained by using maximum entropy method.

Abstract:It's helpful for extracting sea information to research into the random sea wave spectrum. In the paper, we describe a random sea state model and analyze three kinds of frequency spectrum function which are used to calculate wave amplitude in the model. Under different sea wind conditions (e.g.speed and direction of the wind), simulation and comparison are made to test the model. The result of the simulation shows that the model has a good reflection of hydrodynamic feature of the random sea state and that we can use it to get a nice spatial realization of the random sea state.