Abstract:On the basis of analyzing and comparing with several proportional navigations , connected with speciality and demand of guided missile intrcepting higl maneuvering targets , this paper discusses a generalized PID proportional navigation in detail. Using digital simulation made with mathematical mode under typical conditions , the important conclusion is given to show the availability of the method according to the simulate results.

Abstract:The ground clearances of airborne stores is a very important index in the ground compatibility design of airborne stores. It's also one of major factors in determining the scheme of aircraft external carriage. It' s concerned with the aircraft and aircraft external carriage' s safety.But in the military standard of both American and Chinese , the measure of determining the ground clearances is not concerned with the aircrafe's taking - off and landing process on the ground , so it cannot ensure the aircraft and aircraft external carriage' s safety. This article is written for putting forward a scientific measure in determining the ground clearance , according to the' practical use of aircraft , especially through fully considering the aircraft' s taking- off and landing process.

Abstract:In order to explore how to get agility indices with a simulator , the transient agility and functional agility metrics of the third generation fighter have been simulated. Then the simulation results , the calculation ones and the corresponding simulation results of F -18HRAV have been compared. The results show that it is very difficult to get agility indices with simulation method because of the very short time of agility control input and the difference of every time's control input. And the control inputs of the agility metrics should designed again in order to make the value of simulation results greater.

Abstract:This paper analyses the popular design method for the perpendicular curve on airfield vertical section ,points out its defects , and also designates that current method to estimate sight distance can not solve the sight distance problem of vertical section with part concave or setting perpendicula curve. So , it suggests two innovated methods to design the perpendicular curve. At last , a new method to estimate sight distance is brought forward , and this method is strong and easy in computer program.

Abstract:Dependability modeling plays an important role in the evaluation of system effectiveness. In this paper , the aircraft survivability's great impact on system effectiveness is analyzed based on the conceptual introduction of system effectiveness. Then the matrix of dependability in the mission of air - to - ground strike is established. Finally ,by giving an example. the method and steps of establishing dependability matrix in combat circumstance is studied.

Abstract:A new evaluation way is presented based on improved BP algorithm for evaluating the effectiveness of weapons through analyzing several usual methods in this paper. The method is testified by evaluating the ,effectiveness of several foreign typical weapon systems. The results show that this method is effective and feasible.

Abstract:Based on the analysis of natural process on command and control decision , the paper discusses the requirement and structure of decision support in command & control . The command and control decision model named "RIHOPOT" is given. It further discusses the decision support requirement on battle phases , decision styles and support approaches so that RIHOPOT decision model may fit in with the reality of command and control decision.

Abstract:In this paper , a search problem for a target in an area being interfered by false signal is considered. A search process is divided by two stages , which are the signal's gaining and in vestigating , and conditions of the optimal investigating time being terminated has been given by this model.

Abstract:It is necessary for the development of geography information system to put it into net and make it more open , and the import of the structure of distribution and the idea of facing on the object is the inevitable trend of its development. This paper expounds the concept of distributed - object - WebGIS and the design idea, explores its structure of realization , and carries out a research on some important questions stich as GIS inserts , intelligentize corrsumer terminal , three - level clien/server and so on. It also discusses some important techniques which must be used on the net.

Abstract:Based on the properties of combination-filter of Morlet wavelet, a method of discriminating radar targets is presented in this paper. The method is designing combination-filter , convoluting the. signal and filter , computing FFT , and then obtaining frequence-detection. The methos is more simple , easier arid has higher resolution than FFT.

Abstract:Through the research on the relation between environment corrosion and service deadline of the import aircraft , the technology path , methods and process are suggested to discover regularity of environment corrosion on the aircraft key parts and finally so as to reappraise the service deadline一一-calendar life of the import nilitary aircraft.

Abstract:Heat dissipation capability of an electronic system has become one of primary limiting factors for circuit miniaturization. Effective cooling of electronic components is crucial in maintaining the circuit normal operation and enhancing reliability. Numerical simulation is performed for flow field and temperature distribution of rectangular enclosure in which there is a five chips horizontal substrate on the bottom by using finite volume approach . The result shows that the position of the arrangement of electronic component affects strongly the temperature distribution of the environment around circuit board. The conventional equispaced arrangement is not an optimum option. Non - equi -spaced arrangement can reduce effectively the thermalload of electronic component. An optimum arrangement position should be selected when designing circuit board.

Abstract:An adaptive threshold control scheme for packet acquisition is described. In this scheme , the decision threshold is adaptively set according to the ML estimate of the noise power and the performance of this scheme is analyzed.Through the comparison between this scheme and other threshold control scheme for packet acquisition , the advantage of this scheme is shown.

Abstract:The principle of SPM ,XPM effect in optical fiber transmission communication system is discussed based on the character of nonlinear effect of optical fiber. The result shows if the power of one species wavelength optical signal changes , the other optical signals in the same optical fiber will be changed. With this phenomenon , we can realize optical soliton transmission and all optical wavelength conversion in WDM system.

Abstract:The main purpose of signal reconstruction is how to reconstruct signals from observed portion dates.Aimed at the disadvantage of time reconstruction formula of discrete periodic signals , a new formula with the help of Discrete Fourier Transforms (DFf) is obtained. Compared with the time reconstruction formula ， this new formula can reconstruct signals at any time. The calculating result shows that the reconstruction effect of this new formula is much better.

Abstract:IMBE (Improved Multi - Band Excitation) and AMBE (Advanced Multi - Band Excitation) both based on the proprietary MBE (Multi - Band Excitation) speech compression algoritym are intemationally recognized as the best speech compression algorithms in the world , and AMBE has been built in DVSI's AMBE2000 speech compression vocoder. The locomotive voice compression recorder based on AMBE2000 chip possesses the characteristics of intelligibility , full - electronics ,long - time recording and high reliability. The recorder , which has been gradually equipped throughout the railway system , is an important equipment by which railway transportation safety can be realized.

Abstract:An adaptive synchronization system based on auto - correlation principle for frequency - hopping signals is presented. In order to adapt this system to shortwave mobile channels , the synchronization sheme for short integral time , serial acquisition tracking and multistate lock is used. This scheme can overcome the influence on synchronization system due to fading , multiuser and other man - made interferences in shortwave mobile channels and can stably operate under the conditions of stronger interference and deeper fading. Also the state control strategy for multistate lock is presented and its function is described in detail.

Abstract:Asymmetric Digital Subscriber Line-ADSL broadband technology has been more concerned in recent years. Through fully using the widely distributed twisted - paircopper line , it provides users with high - speed data services. Based on the studies of ADSL , the paper describes its technology with the emphasis on analyzing its modulation technology and application prospect.

Abstract:The paper constructs an involution pennutation with 128 bits long by using the MA - structure in IDEA and simply analyses its properties. Finally , a sort of secret 一key block cipher is constructed with the help of this involution pennutation.

Abstract:4H - SiC material and MESFET power device are analyzed according to the operating environment of the airborne phased array radar. A comparison between SiC and GaAs device shows that this novel device finds wide applications in the field of airbome phased array radar. An improved nonlinear large signal model of SiC MESFET for device CAD technology is also developed , which is a model based on experimental measurement. It is used to analyze the power performance of device through SPICE simulator. A good agreement between simulations and measurements is obtained.

Abstract:This paper presents a new method of chaotic communicaion based on multistage Chua' s circuits with time - varying channel gain. In this method , the variation of channel gain is attributed to an equivalent .time - varying resistor that exists in channel. Here , this resistor is regarded as coupling resistor between two Chua's circuits. At receiving end , chaos synchronization of transmitting and receiving system is judged by using current in channel.Simulation results show that chaos synchronization of two Chua's circuits can be achieved when the channel is in time - varying gain. Then a multistage chaotic synchronized system for secure communication with time - varying channel gain is given by using parameter modulation.

Abstract:We analyse the importance and implementing methods of parametric drawing in auxiliary design of computers and discuss the AutoCAD Activex Automation technology and the parametric drawing methods of AutoCAD by C + + Builder.

Abstract:This paper discusses the principle of developing Matlab with Cunder Windows system. It also raises two methods by which c can develop Matlab program through using engine and Active X unattended techndogy. The linking method and procedure in developing software of multi application are completed. This inethod and procedure can also be used in developing other multi application software programs.

Abstract:According to the actual need of maintenance of equipment and the development of Internet and Intranet technology .an equipment's elements information system for maintenance is developed based on browser/server model using the Active Server Pages technique , which is a new type dynamic webtechnique. The emphases are laid on discussing the logical designing of the system database and the operating principle , running environment and programming characteristics of the Active Server Pages technique.

Abstract:This paper briefly explicates three kinds of common application technology: package filtering , application gateway and the proxy service , and discusses the characteristics of the firewall of package filtering , the proxy and the dual hole main stations. Especially we point out the localization of the technology of firewall after the analysis of the security of the firewall. On the basis of it an advice of the new generation firewall is given.

Abstract:Decreasing the tuning time of the antenna is very important in intelligentized and automated short-wave adaptive communication systems. An improvement scheme of a sort of short-wave transceiver automatic antenna tuner is given by illustrating the development of software and hardware. The result of experiments indicates that the tuning rate of the improved antenna tuner is enhanced prominently. The scheme will improve the tactical performance of a sort of short-wave single-side-band transceiver and demonstrate great economic value.

Abstract:In this paper, some problems on the ultrashort waves orientation device are given , and a new algorithm is presented to improve counter-jamming performance. The algorithm based on carrier signal obtained processes data ,and it is characterized by better real time responsibility and counter-jamming performance , and better stable and accurate orienting angle.