Several typical styles of helicopters encircled sonobuoy arrays are introducedand the sonobuoys position models are establishedwhich provides a scientific theoretical basis for sonobuoy placing.The distribution model of submarines initial position was set up and the method for calculating the distribution radius of the submarines was described.Thenthe submarines maximum velocity was estimated mathematically based on some specific hypothesises.The submarines maximum velocity was defined as twice of its economical speedwhich rationality was demonstrated through the probability theory.In this waythe submarines velocity obeys Rayleigh Distribution.Finallysimulation was made about the effect of the submarines initial position distribution and their economical speed on the antisubmarine searching probability of the encircled sonobuoy arraysand some results were obtained.

To make the commander recognize the complicated electromagnetic environment and make correct decisionthe complexity evaluation of battlefield electromagnetic environment was studied.The common complexity evaluation methods was summarized at first.Thenan evaluation method based on value of a Game was proposed from the perspective of operational application.A model of evaluation was constructed and the solution under the optimal mixed strategy was given.The calculation of the scenario showed thatthis method can evaluate the degree of complexity while the both sides have multiple optional operation modes and make the optimized combat operation selectionthus can improve the decisionmaking and training effect.

In recent yearswith the complete upgrade of different kinds of aviation weapon equipment different academies may have different definitions on the functions of the fire control system.In this paperthe function of the fire control system in air combat is discussed with its future development direction.Firstthe nature of fire control system and its functions are analyzed in detailand the role of it in the airborne system is discussed.Secondthe demand to the fire control system is proposed considering the operational requirementsand the effect of the system on improving the operational effectiveness is presented.Finallythe conclusion is proposed that the integration of command and control and the intelligent fire control system should be developed jointly to meet the demand of future combat.

The antijamming performance of Infrared Imaging Seekers (IRIS) is determined by inherent characteristics and antijamming technologies of the seekers.Firstlya set of evaluation index system was given after analyzing the above two aspects.Thenthe antijamming evaluation model of IRIS was established based on Support Vector Machine (SVM) method.The digital simulation indicates the practicability of the index system and the evaluation method.

Fire assignment is a classical hard NP problem.To solve the problem rapidly and efficientlya nonlinear integer programming model was built up and a new quantuminspired estimation of distribution algorithm (QEDA) is providedwhich combined the merit of global search of the estimation of distribution algorithm (EDA) and the merit of local search of the quantum evolution algorithm (QEA).A reasonable encoding method was used and an adaptive quantum rotated operator was designed for fire distribution to improve the iteration efficiency and search capability.Simulation results proved the effectiveness of the algorithm and showed that it can improve the rapidity and accurateness effectively for fire assignment.

Since the Computer Generated Force (CGF) can not take full advantage of battlefield information to optimize CGF submarine search strategy in the cooperative antisubmarine combatthe information fusion technology was introduced into the antisubmarine warfare simulation based on the effective interaction of the information between CGF.The basic confidence assignment of the evidence information was obtained using Back Propagation (BP) artificial neural networkand the information from antisubmarine CGF was synthesized by using the improved DS evidence theory.And thus the antisubmarine CGF mobile strategy was improved.Simulation results show that the introduction of artificial neural network and information fusion technology in antisubmarine CGF submarine search process can improve the antisubmarine efficiency.

In antisubmarine warfareit is difficult to choose the sonobuoys search depth for obtaining the optimum detection effectiveness because of the unknown depth of submarine and complex underwater acoustic environmental.Thereforeit is necessary to gain the sonobuoys optimized search depth using game theory and simulation of underwater acoustic environmental effect.The optimized depth can guarantee the maximum detection capability for the sonobuoy even when the submarine is at a depth difficult to be detected.

A new direct design method was used based on closed loop inputoutput measured data for fault estimationand controllers were designed without setting up a state space model for the fault and system.An inputoutput relationship of the closed loop system was used to parameterize a least square problem for fault estimation.When imposing the lower and upper bounds constrain conditions on the faultsthe fast gradient method was applied to solve it.On basis of the fault estimationsa concept of the subspace predictive control was introduced to consider how to design the controller when the control inputs have the affine forms.The mutually iterative steepest descent method was used to obtain some affine terms and gain termsaccording to the separable principle.Finally the effectiveness of the method was demonstrated by an example of helicopter in hovering state.

In order to correct the unrealistic color of the images captured by the highresolution image acquisition system in real timean improved adaptive and automatic white balance algorithm was proposed.The color temperature estimation in the YCbCr color space was completed by this algorithm，and a regulation module was added to improve the calculation precision of channel gain continuously.Compared with some other automatic white balance algorithmsit could obtain better color correction performance.The circuit design was optimized according to the characteristic of FPGA.The experiment results show that the algorithm consumes less hardware resourcesis fast in image processing and can meet the realtime requirement of highresolution image acquisition system.

A practical tracking system should be equipped with scale adaptation mechanism.To solve the problem of the traditional methods which could not keep up with the scale changing timely and accuratelythe particle filter and an improved Mean Shift method were introduced to locate the centroid of the target.Thenthe correlation coefficient was adopted to map the object and its candidate in the LogPolar Transformation domain to fit the target scale.Experimental results demonstrated that the composite algorithm can select a proper size of tracking window adaptively.Compared with the traditional methodit has a better robustness.

To correctly sort MIMO radar signalsa new reconnaissance method is presentedwhich can make multiple reconnaissance planes collect radar signals in multiple positions at the same timeand multiple independent observations can be obtained.The blind source separation algorithm of complex maximization of nonGaussianity (CMN) is utilized to sort MIMO radar signals.Simulation results show that a separation performance of -10 dB can be achieved with SNR as 6 dB for several typical orthogonal waveforms such as phasecoded and frequency division liner frequency modulation waveforms without considering the amplitude fluctuation.The relative analysis of separated waveforms also demonstrates the validity of the method.

The traditional pixellevel change detection algorithms have the disadvantage of high requirements for radiometric correction accuracy and threshold selectionwhich may limit their applications.An analysis was made to the multiscale segmentation methodand an objectlevel algorithm was proposed based on it.The fused image of the remote sensing images at different time phases was segmented by using objectoriented method in coarse and fine scales respectively to capture object areas of different sizes.Discrepancy image was obtained after analyzing of characteristics vectorsand the intensity of the changed information was defined.Thenthe decisionlevel fusion was implemented using the measurement results of the coarse and fine scales based on multivalued logic theory.Experiments indicate thatcompared with traditional pixellevel change detection algorithmsthe algorithm is less influenced by radiometric discrepancyhas higher detection accuracyand can evaluate the changed intensity accurately.

The current research on motion of pendulous gyroscope is mainly limited in minute azimuth anglewhich cant satisfy the requirement of quick omnibearing north seeking.Unlike the traditional methodwe made analysis on motion characteristics of pendulous gyroscope in large azimuth angleestablished the motion model based on the Euler dynamical equationsand simplified it reasonably according to the actual conditions.Qualitative analysis of movement stability was made based on the Liapunov stability theoryand the condition where there is only one stable balance point was gained.Simulations show that when the azimuth angle is largethe movement of pendulous gyroscope around its equilibrium point is not a sine curvewhich is different from the case in minute azimuth angle;and the swing period varies with pendulum deflection and torque of suspending string.These conclusions can provide a theoretical basis for quick omnibearing north seeking with a large azimuth.

A calibration system used to test polarization navigation sensors was designed in the laboratory based on the polarization law of the natural lightwhich has been fabricated into a prototype.The controlling programs of the integrating sphere and highprecision turn table were developed using VC++6.0.The experiment results indicate the rationality and feasibility of the calibration systemwhich can satisfy the requirements under the condition of laboratory.

An infrared blackbody radiator is a pivotal part of test and calibration equipment for an infrared system.To meet the requirements of minitypelight weight and highprecision for portable field test equipment of the infrared imagerwe designed the structurecontrol circuit as well as the software of blackbody radiator.The blackbody radiator componentsmall and highly efficientwas composed of redcopper radiant areathermoelectric cooler and thermal sink.The temperature acquisition precision of 0.0122 ℃ was realized by using the bridge for measuring temperature driven by the constant current.The conversion precision of 0.01 ℃ between the acquired voltage and the real temperature was achieved by using the indexing function of platinum resistance and the Newton iteration method.Test result shows that the emissivitytemperature control precision and the size of the IR blackbody radiator can meet the requirementand the infrared blackbody radiator has successful application effect.

In order to create an flight visualization simulation system in manintheloopan aircraft motion/dynamic and aerodynamic/gravity model was established to calculate flight parameters and expression of rotation quaternion in real timeand simulating module was designed based on Matlab/Simulink conditions.A 3D virtual reality space based on VRML was built up by Vrealm Builder for simulating visualization.Operating deviceflight control module and 3D virtual space were integrated into a complete simulating system by Simulink 3D Animation Blockset.Results of simulation indicate that the system can realize the flight visualization simulation with high fidelity of scene viewsupply accurate and realtime flight parameter outputand implement flight under the control instruction.The system has good maneuverabilityversatility and scalability.

In order to identify the radar emitter rapidly and reduce the processing stepsa new method based on selfdistilled pulse sequence pattern was proposed.The Pulse Sequence Pattern (PSP) was directly distilled from the full of pulse dataand then was used for matching and identification.This method does not need a process of feature extraction and the deinterleaving of the radar signal as the conventional method thus the processing is simplified and time for the processing is reduced.The simulation results show that the method has high recognition rate.

Passive coaxial spherical cavity is introduced by using a general matrix.In view of the thermallens effect in the cavity of solidstate laserthe closure conditions of thermal lens optical cavity was obtained by using symbolic operation of Matlab.The automatic closed thermal stable cavity model was establishedcombining the closure condition with the thermal lens effect model of optical cavity.The mirror curvature radius was changed adaptively by controlling the deformable mirror with the increase of pumping powerthus could make the output of resonant cavity of solidstate laser stable.

The FLASH memorizer is an important part of the embedded systemswhich has found wide application in engineering.It is very convenient for the users to use the FLASH memorizer by developing the FLASH file systemsuch as copyingdeleting and creating.The TFFS configuration of FLASH under VxWorks operation system is discussed in detail，and how to realize the file system on FLASH memorizer is presented by taking W78M32VP chip as an example for working out the practical problem that the file system can be not formatted.

To study the damage to composite material of lowslowand small target caused by laser irradiationa model of threedimensional transient temperature fields of the irradiated surface was investigated by using a finite element methodand numerical simulation was performed on temperature fields of nylon materials irradiated by a laser beam.The distribution of temperature field and ablation field at different time was obtained.The effect of irradiation time on material damage and ablation process was also analyzed.Furthermorethe influence of the beam distribution and spot radius to temperature fields was discussed.

A method for passive optical athermalization design of middle wavelength infrared optical system with multiple lenses is introducedand an athermalized middle wavelength infrared dualFOV optical system was designed.The optical system contains a zoom objective system and a secondary imaging systemand adopts the technology of passive athermalization optical design.The zoom function is achieved by moving a set of optical components (2 elements) axially.A passive athermalization optical design is presented by using crystal materials Si and Geand two aspherical surfaces.The results show that the infrared zoom optical system in the 4.5~5.1 μm wavelength possesses a compact structure100% cold shield efficiencyand better image quality in the temperature range from -60 ℃ to +70 ℃thereby the correctness and feasibility of the design method are proved.

The distributed interactive modeling process requires a lot of staff participationthereby causes waste of resources and inefficiency for largescale simulation system.To solve the problem we proposed a semanticoriented distributed interactive modeling method.This method improves the current federation development process of High Level Architecture (HLA)and introduces the concept of ontology and semantic mapping in it.The federation development process is divided into three subprocedures as domain ontology constructionsemantic mapping and code generation.A concrete example demonstrates the feasibility and effectiveness of the method.

The problem of multisensor information fusion was studied in timefrequency domainand a new optimal criteria weighted by scalars was proposed.Wavelet transform was introduced in multiscale signal filtering.The state vector and observed value were decomposed into multiscale signalsand the multiscale signals (including approximate component and details) were updated.The local sensor estimation was fused via an optimal algorithm weighted by scalarsand timedomain state estimation was obtained through inverse transformation of wavelet.The method proposed can:1)complete multiscale filtering for the whole multisensor system;2)implement information fusion from the time domainand improve the estimation accuracy greatly;and 3)distribute fusion weights by scalarsthus only the computation of scalar weights is required and the calculation cost is reduced obviously.The simulation shows the effectiveness of the algorithm.

Operational effectiveness is the ultimate expression of system effectiveness under countermeasure conditionand the analysis and evaluation of operational effectiveness is the tallest level of missile system assessment.Considering the necessity of airtoair missile range testand the demand of operational training and function improvement for airtoair missile in the futurethe contents and methods of operational effectiveness evaluation for airtoair missile are discussed.The design objectivesystem architecturemodel constitution and work procedure of the operational effectiveness evaluation system are presented.The operational effectiveness of airtoair missiles under different countermeasure conditions is given through simulation.