Abstract:As suggested by the title of this paper, the author focuses on the fundamental concepts of systems research, its historical background and knowledge structure. He discusses achievements of the systems science made in the ancient and modern times. The author pays a closerlook at different aspects of the systems knowledge, the philosophy and the current situation and provides a list of established schools of systemic thoughts. He inquires into the position of systems studied in the scientific history. The paper concludes with a description about the future of the systems science and a list of some open problems.

Abstract:Expert system is introduced into interception guidance for air-fighting decision (IGAD) in this paper, and the capability of decision support is enhanced by using an extra model base. Finally, the development process of IGAD ES prototype is discussed in detail. The construction of IGAD ES will improve its stability, reliability and real-time performance under the pressure.

Abstract:According to the requirements of altiplano airport and the prohibition of a fighter to down landing-gear above 4000 meters, this paper makes research on the problems of the safe altitude of down landing-gear. The secure model of man-aircraft closed-loop system is given by means of mapkob model .Aviation risk of down landing-gear above 4000 meters is valued basing on calculation and analysis, special secure control methods are proposed .The theoretical results accord with the simulating flight and the real test.

Abstract:A new optimal guidance law is presented on the basis of the simplified missile-target attacking model. The maneuvering targets acceleration and uncertainty of the measurement system has been considered by using Kalman filter theory and a comparative simulation is done on the same conditions for proportional navigation (PN), argument proportional navigation (APN) and optimal guidance law (OGL) respectively to show the optimality of the conclusions.

Abstract:According to the statistic disciplines of failure of military airborne equipment, this paper analyses the relationships between the probability of failure of equipment and work time, with the presentation of the technological approaches of determining calendar life and of the logic-determining methods and suggestions of controlling calendar time limit.

Abstract:Coordinate transformation (C-T) is an important link in the formation processing of air-defense C3I. The transformation from spherical surface coordinate of radar's station to right-angle coordinates of the command center is fulfilled through the earth-centered coordinates, which makes the conversion to the location directly, overcomes the error maybe produced from the processing of C-T. The detailed derivation process and transformation method are given out Considering the effects of the curvature of the earth's surface, the analysis and compensation for the errors are carried through and several methods for the error estimating are brought out.

Abstract:The air defense C3I system has been an important part of modern war and its fighting efficiency analysis is put much emphasis on .By analyzing the capability of the air defense C3I system, an index system is built up for synthetic evaluation of the air defense C3I fighting efficiency, and a new evaluating model and method is proposed by means of fuzzy evaluation model.

Abstract:Originally-based proportion and direct search methods on the reliability of MWS are discussed in this paper.Two examples are given out for better understanding of the two methods listed in this paper.These methods are satisfactory in practical use.

Abstract:According to the fact that Software radio has wide application vista in aspect of military use and civil use, this paper details the key to technology of Software radio,which is open bus architecture, high capacity linked structure, high speed digital signal processing(DSP), wideband analog digital converter(ADC), digital down converter(DDC) and so on. It recommends the industrial standard of Software radio(MMITS), long-range plan of national defense on 21th century and Software agreement. It summarizes some new advancement of the architecture,appliance and techical standards that Software radio has got for recent several years.

Abstract:In the Ka-band satellite communications, signal fading caused by rain reduces service quality of satellite links, and open-loop uplink power control is one of the most cost-effective rain fade countermeasure technique. In this paper, an identification method to the real time clear-sky reference level is presented，it alleviates affects of rapid variations in rain intensity. The specific realized circuits of fade estimation are studied in detail, and the fade estimation is a key part in open-loop uplink power control algorithm .

Abstract:With more and more frequency hopping communications being used in foreign armies,it is urgent for us to scout broad band frequency hopping signals Aimed at the modern UHF frequency hopping singnal reconnaissance,the paper presents a UHF frequency hopping signal reconnaissance scheme,that is ,the software radio station,and then briefey introduces the advantages and disadvantages of the compressive receiver,channelized receiver,acousto-optic receiver and FFT digital receiverFinally the paper puts for ward two types of new combined reconnaissance schemes and test the last one

Abstract:A new method of forming the heart-form pattern, which the TACAN beacon antenna array must require, is introduced in this paper. The TACAN beacon antenna array is optimized by genetic algorithm and a new type antenna array which is superior to published results from other techniques is obtained.

Abstract:In this paper,a guideline following during the transition of GSM to IMT-2000 is put forward, and followed by an introduction of an enhanced network based on current GSM: GPRS ; then the author analyses several transition methods of GPRS, and draws the conclusion that the technology of GPRS could improve the data transition rate and the radio resource efficiency.

Abstract:Secure communications method for higher level of information signal based on chaotic modulation is proposed. In this method, because the level of information signal can be equivalent to the level of chaotic signal, the degree of security is high. At the receiving end, an Adaline maintains the chaotic synchronization of transmitting and receiving systems and simultaneously recovers information signal. Chua's circuits is considered as illustrative example to demonstrate the effectiveness of the proposed method.

Abstract:Aimed at the data fusion system of the radar fence,the paper presents a simple and effective data collocation method—systematic error sequence estimate method This method has a good effect on reducing the target sptlt within the radar fence and insuring the conformability and continuity of radar observationThe results of simu-lation indicate that this method is effective

Abstract:This paper presents the principles, type and format of PDU standard in the DIS-Based Command Training & Simulation System of Air Force Multi- Arms of Services Cooperation. The application is introduced in the War Zone Missile Engagement Simulation System and Air to Ground Army Simulation subsystem.

Abstract:A method applying multiple-bit quantizing DRFM to produce moving decoy target is brought forward. Then , on the basis of the analysis of frequency spectrum of moving decoy targets generator, the mathematical formula of Doppler frequency is educed, some conclusions are drawn, which provide theory bases for working principle and advantage of the system.

Abstract:Based on function linked neural networks, a grade assessment system of caverned hangar is built by means of combined method of neural networks with expert system, at the same time, taking the actual condition of our national defense into consideration. Making use of given data parameters of caverned hangar, such as structural peculiarities, terrain position, force resistance characteristics and the national defense requirement, all of which will be studied, associated, memorized and classified by neural network, and the defense grade of caverned hangar can be accurately assessed.

Abstract:The variations in the delayed time in time delay systems will worsen control quality.For the control of this kind of system,a parameter self-adapting Fuzzy-Gray predictive control algorithm with intelligent integration is presented.It synthesizes the advantages both of the fuzzy control and of the gray predication.The delayed time is identified by neural network to adjust the parameter of the gray predication online.Simulation result shows that this control strategy can overcome the variation in the delayed time and is in response both to the dynamic and the static characteristic of time delay system.What is more,it features a small overshoot,quick response and high static precision.

Abstract:The paper discusses designing method of generating 13 channel pulse waveforms with the ISP(In System Programmable) device and the working principle of the detailed circuit, meanwhile it also discusses the working principle of the high voltage bootstrap pulse power amplifying circuit which consists of special driving chip IR2110 of MOS transistor.

Abstract:With the aid of graph theory, the stability of discrete Hopfield neural networks with diagonal block matrix of the connection weight matrix is mainly studied in this paper. By constructing state graph of the networks, it is proved that the stability is fully determined by the stability of discrete Hopfield networks with the diagonal block as the connection weight matrix. In addition, several results are given.

Abstract:It is expounded in the paper that the wording of the "Direct Choose"and"Reversed Choose" of the moving point and moving reference system is unscientific.It is also illustrated that in the study of problems of kinematics of mechanism it is not proper to restrict the choice of moving point at the contact of two rigid bodies.

Abstract:The double phases co-existing PZN-PFN-based composite ceramics were fabricated by the mixed-sintering method and the reason of the double phases co-existence was analyzed. The dielectric properties and their temperature stability were also investigated. At the same time, the effect of sintering temperature and soaking time on the dielectric properties of the composite ceramics was also explored in detail.

Abstract:This paper illuminates the multiplexing principle of transport stream according to the theory defined in MPEG-2 standard,bringing up a multiplexing method of transport stream by using software,realizing the composite transport stream of six channels program based on the existing computer resource under Visual C++ 6.0 environment,offering valuable reference and basis for hardware implementing multiplexing.

Abstract:Watermarking is a new practical information hiding technique, and has grown rapidly. The robust of watermarked image , the possible attacks and the measure of robust are mainly discussed in this paper. The existing problems are pointed out in the end of this paper.