Abstract:In this paper, our current studies on nonlinearity and blown-ups are summarized. Through comparing linear and nonlinear evolutions, it is observed that discontinuities and singularities are the fundamental characteristics of nonlinear whole evolutions. By combining mathematical models and the underlying physical systems, the concept of blown-ups is formally introduced for the study of whole evolutions. Based on analysis of nonlinear models, mathematical physics meanings and mathematical characters of blown-ups are provided.

Abstract:This paper presents the design principle of a kind of high accuracy digital magnetic heading measure system.Also it advances a new method of compass compensation of this system and verifying the quality of the magnetic sensor.Experiments show that this design is better in accuracy,reliable in operation,simple in structure,convenient for compensating compass deviation and applicable to the airborne heading system of interconnection.

Abstract:Stability of the motion of aircraft is an important part of flight dynamics. In this paper, ляпунов　stability analysis based on nonlinear-aerodynamic and nonlinear equations of motion of aircraft is applied to the steady flight state of high-angle-of-attackThis method plays an important role in overcoming the limitation of small-angle-of-attack and finds application in an aircraft design.

Abstract:In this paper the widely concerned FD-TD method is employed in analyzing Electromagnetic scattering problems of aerocraft basic parts(square cylinder、 circle cylinder、flat board). Rectangular mesh、 effective absorbing boundary conditions and connecting conditions are used and equation of scattering data on the virtual surface which fully encloses the scatterer are obtainedAt the same time Love equivalent principle is applied to the transforming from near zone to far zone in the frequency domain, which saves much time in computing radar cross section(RCS) . And good agreement is observed between the numerical and the measured or other computed results. The method introduced in the paper helps avoid the trouble in finding the rays of diffractions and multiple reflections as compared with the high-frequency approximation--GTD and shows much better effect in solving the EM scattering problems of ultra wide band(UWB) than the methods used in frequency domain.

Abstract:Aimed at the existing problem of a certain type of aircraft sight, a bomb performance improved equipment is developed for the ballistic trajectory windage on non-standard weather condition. The establishment of the task formula for the automatic correcting principle of ballistic trajectory windage, the design of the correcting circuit and the connection between that design and the sight are introduced in detail.

Abstract:Pressure signal in compressor consists of rich state information of the engine, which is valuable for fault diagnosis. Applying fractal theories to the analysis of the pressure data of a compressor before and after surge, this paper calculates its correlation dimension. The correlation dimension is sensitive to the stall signal of engine and can be used as an important characteristic for stall detection.

Abstract:According to UAV flight control' character，this paper presents a new three section combination control tactics. The control tactics include coventional control based on the design of linear control system,super-conventional control based on fuzzy measurement inference and harzard control based on critical criterion. The centre of process unit in UAV receives the signals of informative sources such as radar,sensors and so on，figures out,processes and produces the evaluation signalAccording to it ，the status selector selects the right control signal and controls the terrace of UAV.

Abstract:Aimed at the activity priority scheduling approach, in this paper the probability of activity scheduling success and its influence factors are analysed,then the benefits to improved scheduling success from strat-time flexibility are included and the distribution of gaps remaining in the resource time line is discussed. Finally, conflict resolving policies are presented.

Abstract:The testing background and testing requirement of PC/104-based ATS of WCS are discussed in this paper.And additionally, the program designs of software and hardware are elaborated in detail, especially some key circuits are given, through which the automatic test of WCS is achieved.

Abstract:Some basic discussions and researches are introduced by System Dynamics (SD) based on the characteristics of modern air defense system and the delving of the essence of SD. These worthy explorations and researches demonstrate a wide and promising way to get an insight into the air defense system engineering. And some application fields are considered at the same time.

Abstract:In the course of the transform from spherical surface coordinates of radar's station to right-angle coordinates of the command center fulfilled by the earth-centered coordinate, when the rotation of the earth and the factor of topography and the function of the gravity are considered. The model of the earth and the level surface of the earth are not a one. The coordinate axis and the reality lies the vertical warp. On the base of the analysis of the above factor, a method of error mending is found, and the course of the computing is given, it has a great sense on the improving the precision of the transform and has a use for reference for the further research on the large scale of the distributed system.

Abstract:According to the techniques of GPS and electrical compass,in this paper a servo tracking system is designed,a directional algorithm of microwave vehicle antenna is presented and the way to calculate the angle of pitch and the angle of location under the moving state system on land is obtained.The problem of real-time data collection and system control is solved and the servo tracking system of microwave vehicle antenna is realized by utilizing the line-based anticipated multitask managing function of the up state-machine system of PC core and the down state-machine system of μP core.

Abstract:Blind source separation attempts to recover unknown independent sources from a given set of observed mixtures. The natural gradient algorithm is introduced in this paper, and it is a very important approach for blind source separation. We have examined the algorithm with communication signals and natural speech signals by different activation functions respectively. Simulation results demonstrate the algorithm can effectively separate the two kinds of random mixing signals.

Abstract:A new chaotic sequence generation method,based on the RBF neural network,which has the strong learning ability and nonlinear function approximation capacity and a new chaotic encryption with this method are proposed in this paper.Experimental results show that this scheme can very easily generate much more chaotic sequences with desirable statistical properties than single chaotic map by changing weights of this RBF neural network and this new chaotic encryption has higher security and sensitirity.

Abstract:This paper describes a method used for packet synchronization and error detection in the synchronous digital cable television system.The method relies upon a class of linear block codes whose parity check structure is based on a pseudonoise sequence generated by a primitive polynomial.This structure allows for the computationally efficient implementation of the parity check by FIR filter.

Abstract:The economical-effective problem in model check is very important for simulation system, especially for large-scale complicated military simulation system. This paper discusses how to found its optimal model through the analysis of model check countermeasure and proposes its solution based on linear and non-linear programming.

Abstract:In designing the Band-pass filter of parallel coupled microstrip lines with egual width by using cascade methed,some parameters should be adjusted many times and the results should be validated repeatedly thus causing some difficulties in determining the optimum parameters.To counter this problem,the combination of an improved genetic algorithms and the cascade method is presented in this paper.The optimal parameters can be obtained,by using the combinative method,through single computation and without adjustments.At last the validity of the method is verified through an example.

Abstract:This paper gives a new and better method for quality frequency estimation of single complex sinusoid. The method meaning: decompose autocorrelation matrix of signal in eigen value first to find the biggest eigen value, then reorder a new non-symmetrical correlation matrix according to a certain rule,decompose it in singular value select the smallest vector of singular value and directly estimate frequency by means of the computation formula similar to the Pisarenko method. The simulations experiments show that the new method is of high resolution and high statistical stability in lower SNR and shorter data as compared with the MUSIC method.

Abstract:The analysis model of the bilateral slot line excited by its even mode is simplified by the image theory. Based on the stationary variational formula satisfied by the propagation constant of planar line, the variational formula of the bilateral slot line propagation constant which takes only the slot tangential electric field as variable is given. The calculation done by the formula is simple and fast,and the results agree well with these calculated by spectral domain analysis.

Abstract:In this paper, the concept, capability and characteristic of intelligent control are introduced. The structure of intelligent control is discussed, at the same time the types of intelligent control system are put forward. In the end, the development survey of intelligent control is presented.

Abstract:This paper introduces characteristics of CAN Bus and the main functions of SJA1000,a new type of alone CAN controller. A kind of hard circuit and soft design of the CAN control node based on SJA1000 is presented. The problems that should be payed attention to in designing are discussed in details.

Abstract:An SIQS epidemic model with certain period of quarantine is discussed in this paper, the conditions and threshold to the existence of various equilibriums are established. By means of linearization and constructing Liapunov functional, the conditions about the locally asymptotic stability and the globally asymptotic stability are obtained.

Abstract:Because of the multiformity of evaluating objects of inviting bidding, it is impossible to find a generally applicable evaluating method. In this paper, the results of the research on applicability of several main evaluation methods of inviting bidding, including multi-attribute analysis，fuzzy synthesis evaluating method， grey relation analysis, and principal component analysis, are given in terms of feature of the indices and subjective influences.

Abstract:This paper presents a mathematic model of timetable arrangement in the free-select-courese mode and its assessment system.With the model,problem solving is regarded as a construction of matrix which satisfies several standards.With the assessment system,the optimal arrangement is available.