In this paperthe concept and classification of the Cyber maneuver and the features of the Cyber combat unitare introduced based on the existing research results and the environment and requirements of the future warfare.According to the features of the tactical maneuver in Cyber spacethe difficulties and possibility of fusing the tactic maneuvers of Cyber space with that of the other spaces are discussed.

Aiming at the uncertainty of Threat Level Assessment (TLA) data sources under modern complex battlefielda fuzzy Bayesian network TLA method was proposed by integrating the fuzzy set theory into Bayesian networks.After well considering about the effect of the distance and azimuth angle of threat sources relative to a UCAV on its stealth capabilitythe threat level was evaluated by integrating such uncertain factors as weatherthreat typedistance and azimuth angle based on randomization of uncercain knowledge.Then a TLA Bayesian network was established by adopting Netica software of the Norsys Software Company in Canadaand simulation was carried out.The simulation results show that the method can assess the threat level rapidly and accurately.

Considering the characteristics of pulse waveform of laser echo signal in high SNR which is different from that in low SNR a wavelet filtering algorithm for low SNR Gauss pulse echo signal was studied. The definition of photoelectric detection SNR is introduced and the different SNR pulseecho waveforms are presented in the paper. Then the echo signal accumulation in time domain and smooth filtering algorithm under high SNR conditions are studied. The simulation and analysis of the performance of the algorithm are given. Subsequently for the multiGaussian pulse in the low SNR of the target pulse waveform the lowfrequency wavelet coefficient reconstruction filter is adopted and an appropriate wavelet function and decomposition level are selected by simulation experiments.

At presentthe estimation to the fighter aircraft capability is developed from function concerning to efficacy concerningand how to evaluate the operational effectiveness of the aircrafts in air combat has been explored for a long time.The air combat process is resolved into two parts of beyondvisualrange and withinvisualrange air combat according to the mode of modern air combatand operational effectiveness of the fighter aircraft is evaluated respectively.In allusion to stealth fighterthe radar detection abilitypassive radar detection ability and infrared detection ability are put forward as indexes of situational awareness ability for beyondvisualrange air combat.Analytic hierarchy process is used for operational effectiveness evaluation to both the beyondvisualrange and within visualrange air combatand the ability models are presented.

In airtoair autonomous attackthe Unmanned Combat Aerial Vehicles (UCAV) has the disadvantages of small attack zonepoor mobilityand time lag of information link.To solve the problemsan approach of autonomous attack was proposed aimed to improve attack precision and combat effectiveness.Kinematic and dynamic models of UCAV and the guided missile were formed based on the characteristics of airtoair autonomous attack.The attack zone and noescape zone were calculated out by using the pattern search algorithmthrough which the optimum launch position was indicated.To arrive at the optimum launch positionsliding mode control was used to design the process of autonomous attacking occupationwhich was simulated later.The simulation result demonstrates that UCAV can arrive at the optimum launch position in a short time with stable gestureand attack the target effectively.

In order to attack the top of a target at large terminal anglethe optimal guidance law with impact angle constraint is applied to control the terminal angle of the missile. Since it may occur that the target moves beyond the seekers field of viewa guidance law with an amendment part is designedi.e.introducing a part based on the optimal guidance law. The part works if the view angle exceeds the predefined value to maintain the target inside the field of viewand is turned off to apply the original guidance law if not. The new guidance law can not only retain the high angle characteristics of original soptimal guidance lawbut also deal with the view angle problem effectively. Simulation results show that it is feasible to achieve navigation with impact angle and view angle constraints by this method.

In usual threat modelingthe information exchange among the threats is often ignored.To solve the problema target instruction probability model was established.On which basisa threat netting model based on detection probability was built up.Common path cost function was improved by using the threat netting model.The Differential Evolution Algorithm (DEA) was introducedand analysis was made to the effect of threat netting on threat intensity and threat cost of waypoint by using the method.Simulation was made to the effect of the threat netting model on path planningwhich shows the necessity and feasibility of threat netting model.

The multipath under network environment may cause the fusion node using the past information repeatedlywhich may lead to excessive data fusion and severe estimation bias.To solve the problema distributed information fusion algorithm based on communication connection matrix is presented.The connection matrix for a moment is obtained through the communication topology of the sensor network at that momentthe duplicate priori information is found and eliminated by calculating the connection matrix，and the corresponding distributed information fusion algorithm is established.The simulation results show that this algorithm can eliminate the influence of repeated information in the network to the fusion performance.

To deal with the multiple location points fusion problem of aerial observation platform to the emitter on the grounda fusion method based on probability density function is proposed.After the analysis to the maximum likelihood (ML) estimation methodtwo fusion methodsthe sum method of the probability density function (SPDF) and the modified ML (MML) methodare proposed.Location points are fused through the sum of each points probability density function and the choice of data window to improve the location precisionand the fusion problem in the case of wild observation points and multiple emitters was solved.Simulation results verify that the algorithm can effectively fuse multiple location points to improve the locating precisionand the performance of SPDF method is more robust than the MML method.

A suboptimal approach to the fixedlag smoothing problem was proposed based on Markov switching system.By introducing stateaugmented system in the interacting multiple model frameworkwhich combined the current state with the past onethe state prediction was made synchronously with the smoothing for the original system.The fixedlag mode probabilities were estimated by using the current observation datawhich is a simple but effective method.The proposed smoothing algorithm was compared with that of the normal IMMEKF filtering algorithm through the trajectory of a maneuvering target.The result shows that the performance of the fixedlag IMM smoothing algorithm is great better than that of laterand the performance tends to get better with the increasing of the lag.

In the presentit is difficult and important to calculate and draw the coverage of multiradar sensor rapidly in real time.To solve the problemon the basis of analyzing the existing research achievementsthe CGAL library was introducedand a solution was proposed.Simulation analysis was made for the typical algorithms of triangle grid intersected algorithm and Delaunay triangle subdivision algorithm.Experimental results demonstrate that the proposed method is effectivefeasible and practical.

In order to improve the performance of target recognition system and the precision of target recognition，a model based on radar and infrared sensor was proposed.For radaran algorithm based on parameter learning Bayesian network was proposed.The EM algorithm was employed for parameter optimizationand the target was classified according to its attribute information.For infrared sensorthe algorithm based on wavelet moment features was adopted.The wavelet moment features were extracted and selectedand the target image was recognized through BP neural network.FinallyDS theory was adopted to combine the recognition results of radar and infrared sensorthus the close target recognition based on radar and infrared imaging sensor was realized.Simulation results indicate that:Compared with a single sensorthe proposed model has a higher precision for target recognition.

As to the problem of tracking the glide trajectory of a UAV during net recoveryan innerloop controller combining reaching law based sliding mode control with optimal control was designed on the basis of the outer loop controller with αβ filter.The stability and dynamic performance of the system were improved.Taking a small UAV as an examplewe made a threedimensional digital simulation to the whole netrecovery process.The simulation results show that this controller can realize accurate control of the attitude and trajectory of the UAV during its landingand realize netrecovery accurately even when the deck is in movement.

With the wide application of Tactical Data Links (TDLs) in military affairsthe requirements of integrated networks of multiple TDLs was proposed．Due to the limit quantity of participating nodes in tactical applicationsthe IPmapping gateway in network layer based on link priority rule was proposed to achieve network integrationand an integrated multiTDL node model was created.Finallythe scheme was verified through simulation with a typical tactical network of 20 nodes.

Flight formation of multiple UAVs needs to be reconfigured when the environment changes or missions are modified.Based on the analysis of safety problem during reconfigurationthe process is transformed into a series of online optimizations using distributed model predictive control (DMPC).After the setup of cost function with safety restriction taken into considerationa distributed model predictive control algorithm based on modified differential evolution (DEDMPC) is put forward to deal with the optimization problems at each interval.Simulations show the effectiveness of the DEDMPC algorithm for reconfiguration safety control.The algorithm is superior to the standard DE algorithm in terms of performance.

The dualband/dualFOV optical system can improve the detection capability of an IR system.The optical design theory of dualband/dualFOV telescope system was studied and a dualband/dualFOV telescope system was designed.The system can switch between the FOVsand three kinds of optical material were usedincluding GeZnSe and BaF2.The simulation result shows that the system has simple structure and fine imaging qualityand the MTF value is higher than 0.5 at the spatial frequency of 16 lp/mm.

The critical problem of air combat evaluation was studied.Analysis was made to the data acquisition and processing mode of the evaluation systemand a data processing model was established.Track association method was used to solve the problem of target identification.Based on the features of current air combatthe methods for weapon operation evaluation and for training evaluation under complicated environment were presented with the conclusion.

Based on a certain irreversible flight control system of civil aircrafta model was established for electric control loading system of flight simulator.Taking the elevator system as an examplecentralized processing was made to the distributed subsystem parametersthe mathematical model of flight control system was set upand the composite control method was embedded into the electric control loading system.Simulation experiment was made by using an experiment system developed by our companyand the results was compared with the actual flight test curves of the Boeing Company.The results show that the operating force error is less than 10%the rudder angle deflection angle error is less than 2%which can satisfy the requirement of CCAR60 to the accuracy of flight simulator control loading system.

Due to the influence of clutterthe SAR echo of rotational target rangecompressed domain presents a discontinuous sinusoidwhich makes it difficult to be detected.A new algorithm based on subaperture Hough Transform was proposed to detect rotational target.The detection time duration is divided into multiple coherent processing intervals (CPIs) for integration.The echo in same range cell was coherently integrated via Fast Fourier Transform (FFT) within each CPI to increase SNRand noncoherent integration was made among all CPIs via generalized Hough transform for clutter reduction.The proposed approach is suitable for singlechannel SAR system that has a lower hardware cost.The twostage detecting method has better performance on clutter cancellation and rotational target detection.The results of the simulation indicate the effectiveness of the method.

The architectural model based on DoDAF2.0 was studiedand the definitions and application of the new content of DoDAF2.0 were analyzed.An architectural model of an antisubmarine plane was established by using the UML tools.In additionthe benefits of modeling based on the open architectural of DoDAF were analyzed.The problems might appear in engineering and how to solve them were also discussed.

The principle and the existing problems of radio amendment instruction consisted in the classical mediumrange airtoair intercept missile are described. Then a new method of variable period midguidance instruction is proposed. A variable period instruction model is established based on the Current Statistical Model (CSM) of target. The predicted target motion value is introduced into midguidance instruction,and the period of midguidance instruction is changed according to the estimated remaining time of midguidance. The simulation result indicates that the modified instruction model can improve the tracking efficiency of seeker and limit the error of targets designation angle in intercepting and capturing.

A reliability design and analysis method for electronic products was proposed based on the digital prototype.Firstthe common stress damage models of electronic products are analyzed.Based on the theory of physicsoffailureand taking the design information and prospective working condition of the electronic products as the inputswe analyzed the stress properties of the products under the life profile through computer modeling and simulation.Then failure analysis was conducted based on the stress damage modelthus the failure information matrix was obtainedand a reliability design and analysis method was proposed based on digital prototype of the product.The analysis results to an aero electronic product example show that this method can find the vulnerable spots of the reliability designpresent prevention measures for improving the design and eliminating the potential faultsthus can improve the inherent reliability of the electronic product ultimately.

Since a certain type of missile electrical connector is a product with high reliability and long lifetimeit is difficult to obtain failuretotime data in a short time.For assessing the reliability of the producta stepstress accelerated degradation test was designed based on analysis to its failure mechanism.Thenthe reliability function at the normal use stress level was extrapolated from the accelerated degradation data.In the testthe contact resistor was taken as the performance index and temperature was used as accelerated stress.When analyzing degradation dataWiener process was adopted to model the degradation process.A maximum likelihood function integrating all the degradation data was established for improving the accuracy of estimation.The results show that the proposed approach based on analyzing accelerated degradation data is practical and effectivewhich can realize the reliability assessment of the missile electrical connector and can be extended to evaluate the reliability of other highly reliable products.