A path planning method for Unmanned Aerial Vehicles (UAV) was proposed based on the online Support Vector Machine(SVM) to ensure UAVs reach the destination safely with the minimum probability of being found and through the shortest path.Firstlythe mathematic model was established and analyzed for the path planning of UAV considering the various constraints.The initial path was given by using A* algorithm to obtain the sample data for UAV.On the basis of the initial paththe online SVMwhich has the features of online traininghigh precision modelsmall training sample and strong approximation abilitywas employed to optimize the path of UAV.Finallythe path planning based on the online SVM was used to the simulation of path planning for UAV.The simulation results proved the effectiveness of the proposed method.

For determining the optimum parameters of the transformation function in nonlinear image enhancement processingintelligent optimization algorithm is usually used for automatic optimizationin which the fitness function has great influence on the optimizing performance and image enhancement effect.Generallyonly image energy is included in fitness function for image quality assessment.In factthere are several other important factors as information entropyfirmnessthe change between signal and noiseand pixel difference and so on.Taking full account of the 5 factors above and considering both the global and local imageboth the whole structure and small detailswe designed a new fitness function.The new fitness function was used in genetic algorithm and particle swarm optimization to enhance the imageand the experiment results showed that the algorithm has fine selfadaptabilityand the enhancing quality is improved significantly.

The avionic system is developing towards integrationwhich brings a new challenge to failure prediction technology.Integration features of the avionic system were analyzed and structures for failure prediction of avionic products were presentedincluding modelbased structuredata driven structure and integrated prediction structure.Common features of these structures and their typical application in the field of aviation were discussed.On the basis of whichand according to requirement of integration features and the applicability of structures for failure prediction of avionic productssome problems facing the failure prediction of integrated avionic system were analyzedand preliminary solutions were proposed.

A novel routing strategy is proposed to satisfy the various service demands on hard realtime sporadic occurrencehard realtime periodicity and soft realtime in Fiber Channel.This routing strategy gives prior guarantee to the endtoend delay of tasks with higher priority.The conjugate network calculustransforming the Minplus convolution of cascade service curve into addition in transform domainis applied to analyze the delay upperbound in those worst cases.Thus a simplified method is given to calculate the service curve of multiple nodes.In the endan example adopting the above approach is given to achieve the path routing scheme.The simulation results indicate that the delay upperbound of high priority tasks using proposed approach is much lower than that of tasks using no priority classification.

In view of such problems of aircraft in high maneuvering flight as the uncertain aerodynamic parametersso many unknown external interference factors and possible errors in system modelinga nonlinear adaptive backsteeping controller based on RBF neural network was designed.The generalized uncertainty of aircraft in high maneuvering flight was online approximated by RBF neural networkand the weight matrix of neural network was online updated by adaptive law.The “terms explosion” problem in backstepping design caused by repeated derivation of the virtual control law was solved through introducing a first order filter.By construction of Lyapunov functionit was proved that all signals in the closedloop system were bounded and the tracking error was converged to a small neighborhood around zero.High maneuvering flight simulation of some aircraft was carried outand results showed that the designed controller has good tracking effectiveness and robustness.

Considering the requirement of largescale living 3D terrains resource for simulation trainingwe proposed a new method that using Google Earth as the training reconnaissance environment.The implementation of the simulation training system was presented.Several key technological problems in the development of the system were solvedand function extension was realized.Experiments showed that this method is feasibleand can implement steady training mission simulation.The design may provide a reference for the other simulation systems.

Future airspace window shooting system was born to intercept maneuvering targetswhich was designed and constructed by reasonable configuration of the projectile dispersion centre.A new configuration method of projectile dispersion center named spreadingangleequaldividing method was presentedand a corrected formula for calculating the radius of airspace window was also givenwhich solved the problem of low calculation accuracy of existing methods.Simulation example was taken to verify its effect and the simulation result showed that the spreadingangleequaldividing method improves the flatness in airspace window and enlarges its effective areawhich is suitable to configure the projectile dispersion center in future airspace window.

As a novel and complicated system engineeringplugandplay weapon integration is the development trend of airborne weapon system.Research and application status in this field at home and aboard were analyzedand the focus was put on the technical base involved in plugandplay weapon integration.In view of stores management system designcritical links which shall be considered in the plugandplay weapon integration were analyzed and studied.

False information transmission flaw in Integrated Modular Avionics (IMA) system would seriously impact the aircraft safety.To improve the integrity of IMA system time transmissiona highsafety time management technology for IMA system was put forwardby which all published data on IMA platform will be transferred to subscribers as requested at one designated time window.By using multitime management servicedeviation table between each subsystem and time management service was set upto identify the relationship between local time reference (LTR) and the time reference of each remote subsystem communicating with LTR.The time management technology provides subsystems hosted in IMA with highsafety time synchronization mechanismcoordinates the separated hosted subsystems to safely execute a task togetherthus can satisfy the time synchronization and safety requirements of IMA system.

In modern warfarethe key to winning is sharing information among combat unitsthus to achieve synchronous operations.Data link can provide intelligence information exchange among multipleplatformsand is the connecting bond of sensor grid for networkcentric warwhose application determines the level and ability of information warfare in a significant sense.In this paperthe application of data link technology in airborne electrooptical pod was studiedand a design proposal meeting actual demands was put forward.

For airborne pulse Doppler (PD) radarthe blind Doppler zone (BDZ) is inevitable. To solve the problem of tracking maneuvering targets in BDZa joint tracking algorithm of radar and Electronic Support Measure (ESM) based on extended Kalman particle filter (IMMEPF) was presentedwhich combined the advantages of interactive multiple model (EMM)particle filter (PF) and extended Kalman filter (EKF)and adopted multimodel structure to match the targets movement model. Particle filter was capable of handling the nonlinearnonGaussian problemand EKF was used to generate particle.The particle distribution was closer to a posterior probability density distribution due to its consideration of current measurementswhich overcame the particle degradation phenomenonthus improving the estimation accuracy. Simulation results showed that the given algorithm could significantly improve the tracking accuracy of targets hidden in BDZ.

Based on analysis to the characteristics of electrooptical systemthe application of electrooptical system in stealth aircrafts of foreign countries is introduced.The influences of different windows on stealth performance of the electrooptical systems are analyzedand the results of RCS simulations are given.