S1000D, containing 25 kinds of data modules, is the standard for editing the Interactive Electronic Technical Manual (IETM).To solve the problems of great workload, low efficiency and difficultly in obtaining data, occurred in editing data modules of S1000D, a method for data mapping between MIL-STD-1388-2B and S1000D was proposed.The process of data mapping was established based on multithread, and single data module mapping thread was emphasized.In this thread, fuzzy comprehensive evaluation was applied for ascertaining the data that correlates to the data in data modules of S1000D mostly in supportability analysis record (SAR) database of 1388-2B.The efficiency of editing data modules and the accuracy of the data in S1000D were improved, which may provide a strong material support for the generation of IETM.

Starting with the connotation of electromagnetic environment in the modern battlefield and taking the electromagnetic signal emerged by radar and radar countermeasure equipment for example, this paper analyzes the characteristics of electromagnetic environment in war and its effect on operations.Aimed at the electromagnetic problems encountered by radar, some reasons are investigated from aspects of mutual interference of equipment and electromagnetic attack on radar.In order to show the complex multiple factors that may restrict the electromagnetic battlefield game, characteristics of such typical radar countermeasures tactics as stand-off jamming, escort jamming, self-screening jamming, disposable launch jamming,and anti radiation are summarized respectively.Moreover, the tactical application method of various jamming types is studied, as well as several effective radar counter-countermeasures, including frequency agility, pulse compression,side lobe suppression, and automatic frequency selection.Finally, the paper points out the critical importance of technology interaction between radar and electronic warfare equipment.

At present, F-22 has been equipped in USAF, and F-35 is about to be equipped.The aviation powers, such as Russia, have been on pressing on with the development of the fifth generation fighter, treading on the heels of US.The research of the sixth generation fighter has begun in US for Air Dominance, and the “air superiority” contest around 2030 has started.Based on the USAF strategic conception,the article analyzes the development motivation, latest research progress,capability needs and associated technology characteristics of the sixth generation fighter of USAF.

The air combat decision making of multiple UAVs in uncertain environment has become an important research subject in UAV combat system.The uncertainty of UAV air combat situation information was analyzed, and the combat dominant function of UAVs was built up based on fuzzy information.The dynamic expansion game was transferred into a static strategy game, and the payoff matrix of the two sides of game was constructed based on the fuzzy information.A Nash equilibrium solution method of mixed strategy game strategy with fuzzy information was proposed by using the fuzzy structure element method together with particle swarm algorithm (PSO).Simulation results show the feasibility and effectiveness of the method.

Traditional infrared detection distance model is mainly used for ground target detection, and the flying height of the carrier aircraft is relatively low.Based on analysis to staring infrared thermal detectors, the near space environment was studied and a background radiation model was established.Based on which, an infrared detection distance model of near space aerocraft was proposed, and the application range of infrared bands was discussed.The results show that:1) in the near space environment, infrared band has better detection results; and 2) in the detection using shortwave, the background radiation has a great effect on the detection results.

The design of Course of Action (COA) is an important part for establishing an efficient network command and control system under network conditions, and is of great significance for efficient operation.To solve the problem of finding the optimum COA in a dynamic battlefield environment, a mathematical model of COA was built up by combining Dynamic Bayesian Networks (DBNs) with Learn Genetic Algorithm (LGA) under the known priori information.The prior knowledge was combined with Conditional Probability Table (CPT) to search the optimum COA through LGA.The simulation results verified the feasibility and effectiveness of the DBN based COA model with prior knowledge and the solution method of the model.

The medium-wave and long-wave infrared polarization imaging systems were set up separately based on medium-wave and long-wave cooled focal plane detectors, which have the characteristic of high sensitivity.Choosing typical targets at some particular scenes, infrared polarization imaging experiments were carried out and some effective experimental data were obtained.The results show that:1) the long-wave infrared polarization imaging is more liable to be disturbed by the water vapor, but is better at the characteristics of mean gray scales and gradient; and 2) the performance of medium-wave infrared polarization imaging on anti-jamming from cloud and detecting camouflage nets is better than that of the long-wave infrared polarization imaging.Considering their characteristics, we can select medium-wave or long-wave infrared polarization imaging system according to the requirement.

To the information fusion estimation in distributed multi-sensor network, a consensus algorithm that can improve the convergence speed is proposed.Firstly, the graph theory, the conventional average consensus algorithm and the weighting matrices are introduced.Then, the cost function is defined by the LMS principle and the estimation error between the local node and its neighbor nodes, and the weighting matrices are updated by the cost function.Thus the fast consensus algorithm can be obtained.The parameter selection is also introduced briefly.Simulation was carried out using several common weighting matrices.The results show that the fast consensus algorithm can improve the convergence speed, especially for the sensor network with low connectivity.

Considering the flexibility of the aircraft in low-altitude airspace, we put forward a flight conflict detection algorithm adaptable to the low-attitude airspace flight based on conflict probability.In the algorithm, the spatial precision and time parameters were taken into account, the indefinite integral of the extended conflict area in the direction of the relative motion of Paielli algorithm, is changed into a definite integral corresponding to the conflict time, which has determined upper and lower limits of integration.The conflict probability is transformed into the integral of the cross volume between the collision area and the joint track error corresponding to a certain moment.The quantization solution of the conflict probability model is realized by Cholesky factorization and matrix rotation, which is more accurate for the prediction of the conflict probability.

According to infrared smokescreens shielding principle, a model of infrared smokescreen transmittance in 3D space was constructed by using the extinction model and expanding model of infrared smokescreen.Considering the limitations of the traditional simulation method for the shielding effect of smoke screen, a method for simulating the transmittance in 3D space was proposed, and simulation was made for the method.The result of research indicated that the images of target observed by the detector is the result of stacking of several layers of transmittance, and the shielding effect is better than that of traditional methods.The method is of great significance for engineering application.

The capture probability of the seeker when midcourse guidance switches to terminal guidance is the core for the design of the combined guidance air-to-air missiles, and is very important for the overall design of the missile.In this paper, the effect of data link error on intercept probability of infrared air-to-air missile after launching was studied.The results show that the data link errors have a great influence on performance of missile capture.The results can be taken as a reference for the design of lock-on-after-launch missile.

A terminal guidance law based on zero-effort miss distance was designed with sliding mode approach for attacking a manuvering target.First of all, according to the motion equations of the missile and target, a system model was established.Secondly, the zero-effort miss distance was selected as a switching surface of sliding mode, and the terminal guidance law of the pitch channel was deduced using exponential reaching law and the fuzzy control method.Finally, trajectory simulation was carried out for a snakelike maneuvering target, which verifyed the feasibility and effectiveness of the designed guidance law.In addition, the simulation results also show that in solving such problems as fluttering with sliding mode guidance law, the method with fuzzy control has better robustness and is more effective than the method using saturation function instead of signum function.

A new north-seeking method was proposed based on navigation attitude angles, and the formulas for calculating the azimuth angle of carrier in one-position and dual-position north-seeking were deduced.The validity of the formulas was proved by simulation.The formulas are simple, and are independent of local latitude and earths rotation angular velocity.

A multi-channel MAC protocol based on burst technology (BT-MAC) was proposed according to the requirement of military aeronautical Ad Hoc network to the time delay and transmission reliability in real-time communication.By using the mechanism of multi-channel, burst technology and asynchronous frequency hopping, the time delay of packets was decreased effectively, and the system was provided with the capability of anti-jamming.Simulation shows that the theoretic analysis result is basically the same with the simulation result, and the time delay performance of BT-MAC is obviously better than that of TDMA.

Integrated Modular Avionics (IMA) is the newest avionic architecture.In this paper, the position and function of high-speed digital transmission and exchange array, and the related critical technologies, are discussed.A scheme for implementation of high-speed digital transmission and exchange array is proposed.The test result shows that the scheme can realize stable and reliable data transmission and exchange.

As to the issue of identification and elimination of the outliers in data measured by airborne system, an improved polynomial extrapolation fitting algorithm is proposed, and the outliers of GPS and AHRS data are identified and corrected in FPGA.Standard deviations of parameters are calculated out according to statistic characteristics of the data, and the polynomial extrapolation fitting algorithm is improved to make it adaptable for identification and elimination of outliers.The results of experiment show that this method can identify and correct the outliers effectively, and can satisfy the requirement for flight test.

Based on the feature that Helmholtz coils can produce a uniform magnetic field, we made triaxial Helmholtz coils to generate magnetic fields with three orthogonal directions for simulating the geomagnetic field intensity by changing the importing electrical current of the three coils.This device could offer geomagnetic field environment for the hardware-in-the-loop simulation of geomagnetic navigation system.A lot of experiments were made to find whether this device is suitable for the need of simulation.These experiments included the tests on repeatability and linearity, and on response speed, uniformity and stability.The input/output model of the device was also established.These experiments proved that the indexes of the device can satisfy the needs of the laboratory.

Considering that the flight control of unmanned combat aerial vehicle (UCAV) is required to have high accuracy, high attacking angle and rapid change of flight state during UCAVs autonomous attacking, we designed a nonlinear backstepping flight controller.Firstly, we established a nonlinear flight model based on six degree-of-freedom aircraft equation.Then, we separated the speed controller design from the attitude controller design based on singular perturbation theory and backstepping control.The problem of ‘differential explosion’ in traditional backstepping was overcome by using simple first order command filter.The tracking error of the controller was proved to converge exponentially to zero according to Lyapunov stability theory.The simulation result proves that the nonlinear controller can track the input reference signal with high accuracy even when it changes dramatically.

The modern stratospheric airship is required to reach the altitude of stratosphere safely and smoothly.The relationship between the airships altitude control and pressure difference control was analyzed.According to the characteristics of stratospheric airships, a feedforward altitude control approach was proposed.The simulation results showed that the feedforward controller had some limitations, and couldnt meet the goals for altitude and pressure control.Thus we put forward a pressure difference controller, and two solutions to resolve the integration problem of altitude and pressure controller.The final simulation results make known that the scheme of restricting the altitude controllers authority can ensure the airship to reach the required altitude safely and stably.

In order to meet the high precision demand for UAV carrier landing and improve the prediction accuracy of carrier motion, the deck motion prediction technique was studied.In order to fit the carrier pitching motion, the shaping filter system of rational form with introduced white noise was used as input.The Kalman filtering theory was used to predict the pitching motion of the aircraft carrier deck.On which basis, and by using the prediction results of the deck heaving motion and roll motion, prediction to the ideal touchdown point vertical motion was realized.The simulation results show that, this method can effectively predict the aircraft carrier deck pitching motion and the ideal touchdown point vertical motion 3 second ahead of time, which is of great significance for improving the safety of the carrier landing.

A new method for constructing infrared models of warships was proposed on the basis of traditional methods for establishing infrared models.The new method is mainly aimed at analyzing geometric relations and rebuilding models.By this method, the models can be constructed rapidly and efficiently.The method was developed further and applied in the simulation of scenes for infrared confrontation and the deduction of battle situation.Based on which, simulation was carried out on warships infrared stealthy effectiveness, route planning and evasive maneuvering, and analysis was made on the infrared simulation effectiveness.The result showed that the model constructing method has high accuracy and fine effectiveness.

So far SDRAM memory expansion is entirely dependent on the upgrade of semiconductor technology, and the speed-up is up to the clock utilization pattern.The speed of DDR3 SDRAM has been increased by a factor of 8, hence the further improvement is extremely difficult.A novel serial access SDDR memory structure and on-chip serial only write bus are presented in this paper, encapsulating the DDR memory into components connected by message, packaging such information of the accessed memory as command, address and data and so forth into message packet and exchanging information through on-chip serial only write bus and component-based DDR memory.SDDR memory reduces the number of pins, has simple connection, high anti-interference ability and reliability, and is easy for expansion and improving the clock rate further.Therefore, it has obvious practical prospects.