Abstract:Using the Z buffer arithmetic and double buffer technique of DirectX, an all-purpose, exoteric platform of Virtual Instrumentation is built by multi-layered, real-time rotating and zooming sprite in this paper. And it is applied in the flight data process. The practical application demonstrates that the proposed technique can be used to realize all-purpose Cabin-simulation.

Abstract:By applying artificial neural network technology, research is conducted on the calculation of aircraft taking-off running distance. This paper presents a new calculating model of aircraft taking-off running distance based on BP network. It processes the actual aircraft taking -off running distance and the influential factors unitarily. The results of simulation show that this method is effective and feasible.

Abstract:After an analysis of the demand of pilot steering quality evaluation for flight data, the model of pilot steering quality evaluation of avion is established according to the outline of flight training and the flying characteristic of avion. The system of pilot steering quality evaluation of avion which can run on the platform of normal PC is made by using the language of Visual C+[KG-*2/5]+6.0 and DirectX technology. The system can quickly recognize the flight state and maneuver action based on the expert system theory, assess the grade of flight subject automatically, redisplay the flight course realistically. So it provides a technical method for improving flight skill and insuring flight safety.

Abstract:The construction of the technological support command of aviation equipment is a key link of the informationalization. A deep and full process analysis of the architectural framework of the aviation equipment technological support command is finished in the paper. Using the research thought of C31 for reference, a three-views architecture is put forward which can illustrate the system architecture as three-dimensional views: application, system, and technique. The research in the paper is of directive significance to the system development of the technological support command of aviation equipment both in theory and in practice.

Abstract:The design and implementation for a kind of wide-range variable thrust liquid propellant rocket engine control system is presented. Accelerated circuit of electromagnetic valve is designed based on switching between high and low voltage, and embed operation system μCOS - II is transplanted to 80C196KC. Regulation of thrust in wider range is implemented by variable parameter proportion and dead zone compensation. The semi-physical test demonstrates that the system can satisfy the control target, with the regulating time less than 60ms and stable state error no greater than 5%.

Abstract:Radar signals are of non-stationary, so extracting effective classification features from them by general transformation methods is very difficult. Based on the characters of wavelet packet bases, a method of recognizing radar target is presented in this paper. The target recognition observes the following process - first resolving the wavelet of radar echo-signal, selecting the optimum wavelet bases via given training sample sets based on distance criteria to get the feature vector for target recognition, thus the targets are recognized by the effective features. The experiments of recognition using the data of three kinds of aircraft models are performed and the result demonstrates high recognition rate and low sensitivity to noise by using this method.

Abstract:The effectiveness evaluation on the ground-antiaircraft weapons is an important content of the effectiveness evaluation on the military equipment. According to the characters of the ground-antiaircraft weapons, the factor analysis in multivariate statistics is proposed in the effectiveness evaluation on the ground-antiaircraft weapons and its corresponding model algorithm is established. The method is verified through the typical equipment evaluation. The result shows that the method is feasible.

Abstract:The structure of hardware as well as the design idea of software of the automatic and fault diagnosis system for radar based on PXI and GPIB bus is introduced, then the methods of how to apply the relational Database and expert knowledge to the field of automation testing and fault diagnosis are discussed.

Abstract:In the multi-object localization, most of the existing methods are based on accuracy time - delay estimation. In this paper a maximum - likelihood multiple sources localization estimation method is presented. The ML method can be used in estimating multiple source locations, while such case is rather difficult for the time - delay method. In the single source case, the ML estimator is shown to be equivalent to maximizing the sum of the weighed cross-correlations between time shifted sensor data. Numerical examples using simulating data demonstrate the effectiveness of the new method.

Abstract:In order to detect the weak signal from the strong noise, the excellent time-frequency localization analysis properties of wavelet packet transform is analyzed according to the different Lipschitz exponent the frequency spectrum of signal and noise are analyzed by introducing ∞ - norm. Then, the optimal subspace entropy and the position parameters of the intact bintree in optimal subspace are regarded as the characteristic quantities, the low SNR radar signal detection is realized by using the method of floating threshold denoising. Lastly, the low SNR radar signal detection based on wavelet packet transform and wavelet transform is simulated through numerical calculation in computer, at the same time, the conclusion that the wavelet packet transform is better than the wavelet transform in the low SNR signal detection is drawn.

Abstract:An adaptive MIMO channel estimation based on Kalman filtering is proposed in this paper. The process of Excess Error Energy varying with iteration number is analyzed. The numerical simulation of Kalman channel estimation and Maximum Likelihood (ML) channel estimation based on orthogonal training sequences applying in saturated and subsaturated system is presented. The simulation results show that the performance of Kalman channel estimation proposed herein is closed to that of ML channel estimation and Kalman estination works better in saturated MIMO system.

Abstract:By analyzing the principle of the traditional MSK modulator, the more direct dependent relationship among modulator coefficients is found, thereby a novel model of MSK modulator is put forward. By comparison with the traditional model, this model is simple in structure, easy in realization and is improved in reliability and the character of real time.

Abstract:A new filtering algorithm with the purpose of eliminating impulsive noise is presented. In order to keep the content of signals as much as possible when the noises are removed, the following approaches are developed in this paper. Noisy items are identified by inspection of their surrounding neighborhood, and afterwards their values are replaced with the most "conservative" ones out of their neighbors' value. If a pixel value is the extremum (max. or min.) of its neighborhood, it is a noise pixel, or else it is a signal pixel. Experiment results show that the new algorithm is good in performance to keep the content of image and remove noise, especially in the case of strong noise.

Abstract:The usage probability of wavelength in wavelength routing optical network is described by using a Birth-Death Process and the WDM network is described by a model of M/M /n/n. Based on the hypothesis of link independence, the effect of ideal all-optical wavelength converter and SOA - FWM wavelength converter on the blocking performance of wavelength routing optical network is analyzed.

Abstract:his paper presents a novel abnormal monopole antenna by means of optimization with FDTD method genetic algorithm. The relative bandwidth of the antenna with input voltage standing wave ratio less than 2.5 exceeds 100%. This antenna can be used in ultra-wideband communication systems.

Abstract:This paper analyzes the transmission mechanism of unshielded twisted-pair according to the status of the leakage of electromagnetism information of UTP used in LAN, consequently educes the coupling model. This test is a typical EMC experiment item. It may provide a reference for dealing with the EMC problem of UTP.

Abstract:The modified Chua's circuit is built by actual electric elements, and the state equations of the modified Chua's circuit are given. The synchronization between the two modified Cuua's circuits is studied through EWB imitating and experiment. The effect of the coupling resistance and the errors of the elements parameters on the synchronous quality are briefly discussed. Lastly the experimental results of the synchronization in the two modified Chua's circuits are presented. The researches show that the synchronization is realized more easily and the synchronous quality is better in the modified Chua's circuit than in the Chua's circuit.

Abstract:With the rapid development of information technology, the traditional technology of identity - verification can not meet the requirements of electrical information security. This paper presents a trusted third party authentication system, which can provide a function of network authentication with very high security. The system is based on Iris - identification and is superior to other biometrics in respect of personal identification.

Abstract:A DWT based on hybrid information hiding technology oriented to confidential communication for images is presented, based on this, the flowcharts are described in detail and their technological characteristics are analyzed. Then, the results of the experiments are shown and the conclusion is made. Both the results and the analysis indicate that the algorithm is good in performance in the application of information hiding technology to confidential communication.

Abstract:This paper develops a new kind of method to measure the shape feature and displacement of barycenter. A CCD camera is fixed on the air-bearing module to collect visual signal. Through calculation each frame's characteristic area by using B-spline wavelet transform to obtain edge and eigenvalue by technology of orientation and construct a kind of B-spline wavelet, the capability of identification of character is improved and the position of barycenter of each region is detected. In the paper, constructing compact support scale functions with linear phase, and corresponding compact support biorthgonal wavelets by means of B-spline.

Abstract:Software reliability forecasting is very important for improving and controlling a software engineering process. This paper presents a wavelet analysis based on forecasting model for software reliability. By the model, the time series of software faults can be decomposed into trend term, periodic term and time-modulated stationary processes, and then forecast them separately. The experience shows that the wavelet analysis approach to software reliability forecasting is feasible.

Abstract:By taking the problem of transportation assignment as an object for research, the shortest time limit of task sent in advance and the shortest total time of task are presented, at the same time a network model is built in this paper. Based on graph theory, the optimal algorithms are designed by the methods of maximum flow and the shortest time flow. Finally, the experimental calculation is presented.

Abstract:Integer programming problem is NP problem. The efficiency is low by using the routine methods to solve integer programming problem when there are many variables and many restrictions. Aiming at the existing shortcomings in genetic algorithm, the combination between genetic algorithm and chaos is presented. On this basis, the hybrid genetic algorithm for solving integer programming problem is devised. The example shows that the algorithm is very effective in increasing the computing efficiency.

Abstract:The research on response to random excitation is the key to the analysis of stability and reliability. Based on the method of cumulate-neglect closure, the response of magnetic levitation control system to random excitation is discussed in theory, the approximate solutions are obtained. It is of great theoretic importance to improving the design and realizing the stable control for the system.