Integrated Module Avionics(IMA) is the development direction of the avionic systemand its technical standards have great significance on guiding the development of avionic systems onboard new types of military and civil aircrafts.Some concepts and technologies of it have been used in the avionic systems of RafaleF-22F-35A380 and B787.In this paperthe technical standards of Allied Standard Avionics Architecture Council (ASAAC) on system architecturesystem softwarecommunication/network, common functional module and packaging, and the relevant standard of ARINC are discussed.

Covariance intersection algorithm is a conservative distributed fusion estimation method obtained by optimizing certain objective functionwithout needing to compute the correlation among local estimation errorswhich provids a new idea for image fusion enhancement.Firstlythe 1D covariance intersection algorithm was introduced;then this method was extended to 2D signal and image fusion for the first timeand an image fusion method based on covariance intersection was put forward.Finallythe fused image was compared with the existing fusion methodsand the results showed that fusion effect of it was superior to that of wavelet methodempirical mode decomposition methodand non-negative matrix factorization method.

To study resource management of integrated radio frequency system onboard advanced fighters for “single-to-multiple” jamminga systematic scheme of radar/jamming based on active phased array antenna was analyzedand a model for threat level evaluation was built up by means of multi-attribute decision-making.The jamming task requirement model was established based on the given threat thresholdand time division multiplexing mode was used for jamming multiple targets.An adaptive dynamic resource allocation method was proposed.Two criterions of jamming resource management were proposedthe minimum mean deviation of threat-level and the minimum deviation of highest threat-level.Combined with the algorithm of radar resource managementthe method can be used to realize the integrated management of radar and jamming resources as well.Computer simulation indicated that the adaptive method of resource management could optimize the dynamic allocation of jamming resources.

Aiming at problems existed in air-to-air missile attacking highly maneuvering target with variable structure guidance lawsuch as the divergence of line-of-sight angular rate and indetermination of variable structures parametersa new 3-dimensional guidance law was designed based on varying exponential reaching lawwhich could adjust the variable structure parameters on line by using multi-input multi-output RBF neural network (RBFNN).The simulation results show that the new guidance law can effectively reduce the buffeting and improve the guidance accuracy.It has strong adaptive capability and robustnessand can meet the tactical requirements for air-to-air missiles.

Task assignment method plays a key role in manned /unmanned aerial vehicle formation cooperative air combat.Firstlya task decomposition method with constraint of timing sequential was presented.Thenthe task assignment model was established based on the improved Contract Net Protocol (CNP).The task assignment efficiency was enhanced by adopting the acquaintance model.The timing sequence task was processed by adopting the task validity parameter and blackboard mechanism.Finallysimulation was carried out based on the CNP task assignment modelthe result shows the well performance of the task assignment methodwhich can fulfill the requirement of cooperative air combat.

To the patrol searching problem of antisubmarine patrol aircraft using radara radar searching probability model was presentedwhich considered the scanning width of radar searchingthe submarine exposure rate and detection avoidance rate.Based on thisthrough analyzing the patrol line station and relative movement of antisubmarine patrol aircrafta general patrol searching detection probability model was built up by adopting area equivalent method.Finallythe influence of searching timelength and station position of patrol line on radar detection probability was analyzed by simulation.The results showed that:1) the area equivalent model can better solve the patrol searching probability calculation problem of antisubmarine patrol aircraftand 2) the radar detection probability increases with the searching timebut it tends to a special valueand the maximum detection probability is not high.

Application of image in long-range precision strike of naval gun to seacoast fire support was discussedin which a new technical idea of using multi-source images from satelliteunmanned aerial vehicleTV-reconnaissance bomb and imaging terminal guidance shell for long-range precision strike to seacoast fire support was presented.Applications and development tendency of image in target strategic reconnaissancelocating and trackingdirected attack and damage assessment were analyzedand some key technical problems needing to be solved in image processing were pointed outwhich is useful for the development of large caliber naval gun weapon system.

The issue of unmanned combat air vehicles (UCAV) to attack ground targets with laser guidance missile was studied. Considering the multiple constraints and high real-time requirement in air-to-ground weapon delivery trajectory planningwe proposed a general framework of autonomous attack trajectory planning systemestablished the Acceptable Launching Area (LAR) model for the missileand proposed a strategy to generate 3D weapon delivery trajectories based on an improved A-star algorithm. This algorithm combined the optimal constraints and UCAV motion constraints to find the appropriate successor nodewhich can greatly decrease the complexity of the algorithm. We chose an appropriate step to eliminate height change within each stepwhich helped to separate horizontal plane and the vertical plane of the trajectoryand then revised the vertical trajectory height based on normal acceleration. Simulation results prove that this strategy can quickly generate a 3D weapon delivery trajectory which can lead the vehicle to the target LAR and satisfy the constraints for launching a missile.

In order to implement high-precision and rapid passive locating of airborne IRSTand considering the limit of ordinary inter-flight data link to large-capacity image transmissiona method for passive locating of airborne IRST was proposed based on laser link.The principle of locatingthe process of establishing airborne laser linkthe infrared image registration and fusionand the infrared target detecting and recognition were analyzed.Unscented Kalman Filter (UKF) was studied and was used to estimate the state parameters of the target taking the effect of observation equations nonlinearity and noise into consideration.The simulation result showed that the method can improve the evaluation accuracy of distance and velocityand can also improve the locating precision with increased airborne IRST sampling frequency.

Air/ground target classification is a key step for ground target filtering in airborne early warning radarwhich can improve the quality of target track effectively.On the basis of exploiting target track information and ground road informationa method for air/ground target classification based on similarity of track and road was proposed.Firsta fast arithmetic matching target filtering plot to a section of road was givenwhich could choose the roads used to classify air targets and ground targets subsequently.Thento the roads with windingaverage distance and correlation coefficient between target track and road were calculated out.Finallytarget classification was completed according to threshold decision and sliding window processing.The simulation results show that the method can implement air target and ground target classification accurately for different types of target track distribution.

Performance improvement of function regression based on Support Vector Mmachines (SVM) by automatically tuning multiple parameters of regressors was considered.This was done by minimizing some estimation of the generalization error of SVM using gradient descent and Genetic Algorithm (GA) over the set of parameters.Performance of the proposed method was illustrated by extensive experimental results.

An effective scanning method realized by controlling the scanning angle was proposed aiming at the drawbacks in stable scanning phase of Terminal-Sensitivity Projectile(TSP) as low efficiency and false alarm.Firstlya model was established for the scanning phase of TSPand analysis was made to the scanning trajectory as well as the disadvantages of traditional scanning method.Subsequentlya search algorithm with a controlled angle was proposed and its principle was then detailed.Finallysimulation demonstrated that the proposed approach can significantly improve the combat effectiveness of the TSP.

Based on the application requirements of small airplane avionic systemwe designed a logical framework of the systemand put forward the top-level Functional Flow Block Diagram (FFBD) of flight display and integrated processed computer by analyzing the framework of small integrated cockpit avionic system.Three critical technologies were proposedincluding real-time multi-channel data acquisitionredundancy path realization and data loading.Then the specific realization method was given.This system was implemented on VxWorks embedded real-time operating systemand has been applied in an integrated avionics project for a certain type of aircraft.

The narcissus is an important parameter for evaluating the imaging quality of the cooled infrared optical system.The cause of narcissus for infrared optical system was analyzed.The method for controlling and analyzing narcissus in optical design software was discussed.A method of inverse path tracing rays was proposed for analyzing the magnitude of narcissus of each surface in the optical system.A cooled optical system working in the LWIR was designedwhich focal length is 120 mm.The method of inverse path tracing rays was used to analyze the magnitude of narcissus of each surface of the optical systemwhich was in accordance with the YNI and I/Ibar parameters given by the optical design softwareand the results calculated by the empirical formula.And the method of inverse path tracing rays for calculating narcissus is more direct.

In view of the complex test environment and characteristics of measurement datathrough a deep analysis of the causes of abnormal dataa method for eliminating abnormal data based on two-sided test of measurement result data by use of polynomial fitting was presented.When the test result met the repairing conditionweighted repairing was conducted for the eliminated data.Real data test showed that this method can effectively overcome the influence of data mutation and paragraph stephas better model stability and higher abnormal data eliminating ratewhich can meet the actual requirement of experimental task and is of high practical value in engineering.

The images generated by large-FOV optical equipment usually have geometric distortion.It is difficult to implement real-time correction of the geometric distortion for images with high resolution and serious distortion on hardware platforms.After analyzing the problems of the existing serial and parallel algorithmswe proposed a structure of buffer in which both odd and even pixels in the odd and even lines of the images were buffered separately.Bilinear interpolation algorithm was used together with the proposed structure for implement geometric correction and gray grade correction of the images.The experiments results showed that the proposed structure may realize gray interpolation algorithm easily with less resourcesand implement real-time distortion correction with a shorter delay.

In ISAR imagingthe phase error caused by nonuniform rotation is relevant to the radial position of scatterersso it is difficult for us to use traditional phase focusing algorithms to complete the phase compensationin which the uniform phase correction function is applied.In order to solve the problemwe put forward a phase compensation method based on adaptive Gaussian Chirplet decomposition (AGCD) fast algorithm.In this methodthe linear frequency modulation (LFM) signal parameters of two stronger scatterers in random range bin are obtained via AGCD algorithmand then the multiple prominent point processing (PPP) model is implemented to eliminate the phase error caused by translational motion and nonuniform rotation.This method has the advantages of low computation cost and high accuracyand it doesnt require the scatterer be well isolated.The numerical simulation proves its good efficiency.

The maximum communication distance of main CSMA/CA protocol in present 802.11 communication protocol is only 300 m;and the system performance declines dramatically with the increase of distance over 300 m.The cause for this problem was analyzedand a method of changing ACKtimeout in accordance with the variation of distance was providedwhich improved the performance of CSMA/CA protocol in long distance communication.Simulation was carried out with OPNET softwareand the results showed that in long distance communicationsystem throughput is improved and connected delay is reduced.

The Head-Up Display(HUD) with a image source of CRT generally has high requirements to the performanceefficiencyvolume and weight of the High-Voltage Power Supply (HVPS).Having the advantages of small sizelight weight and high efficiency etcthe PWM type HVPS has found a wide application.The principle and unit circuit of the HVPS was introduced.The contravariant mode was used in the circuit.The 27 VDC was changed into the needed high voltage through processing of power conversionvoltage boosting and transformationand dual voltage rectifying.Stabilizing of the voltage was realized by using the pulse width modulator SG1525A.

Considering the security issues in database joint owners authority management and in modification of databasewe put forward a database watermarking algorithm based on secret sharing technology.In the algorithmthe relational databases used secret sharing technology to embed the watermark in the databaseand n times of interpolation were implemented to the database watermarking using Lagrange interpolation formulathus to realize database watermark embedding and recoveryand the database owner could be jointly responsible for the security of the database and robustness.Simulation experiments showed that the proposed algorithm can reduce the redundancy of database enhance security safety of database watermarkand has certain robustness to watermark detection when some of the data in the database are deleted.

A three-axis stabilized orthographic barrel was designed for aerial survey.This barrel carried an high-definition (HD) digital camera and a micro-TVand realized orthographic observation and photograph with inertial stability by using angular speed closed-loop control mode and inertial pointing position closed-loop control mode.Different from traditional gyro installation in bearing ringthis barrel used independent MEMS GPS integrated navigation system to realize disturbance isolation and orthographic direction.The desired angle position and angle speed compensation equation when the integrated navigation system was installed on the barrel shell were derivedand the design principlemethod and model of control modules were presented.The testing results showed that the stabled line of sight is perpendicular to the groundthe orthographic error can be controlled within 3°which can guarantee the longitudinal and transverse overlapping ratereduce the appearing of aerial photograph hole.

Considering to the problems of long test timehigh cost and low efficiency for the double-step-down-stress degradation test for high-reliabilitylong-life productswe presented an optimal design method based on Monte-Carlo simulation for double-step-down-stress accelerated degradation test(DSDS-ADT).Simulation was made for the acceleration test with Monte-Carlo method.Taking the number of inspections on each unitthe number of test units and inspection frequency as variablesand the total experimental cost as a constraintthe asymptotic variance estimation of 100 pth percentile of the lifetime distribution of the product as goal functionwe established the optimal designed model of DSDS-ADT based on Monte-Carlo simulation.Simulation results verify the feasibility and the validity of this methodand provided a theoretic support for optimal design of accelerated test in life prediction of electronic equipment.