Abstract:In air combat tactics and efficacy researching, it is often first to define the expected aircraft's maneuvers, then the dynamics parameters related to the maneuvers need to be determined. Aimed at this problem, the paper discusses the air combat maneuver modeling which has accurate dynamics property and also suits the need of air combat research. The simplified dynamic model is set up, in which the imports are aircraft's load vectors and engine's state or aircraft's velocity are taken as the imports of maneuverable action, these imports have close connection with air combat maneuver description and well transform the intension of pilot into the maneuver's control input. The simulation results show that the model is high in simulation precision，simple, practical and suitable for air combat tactics simulation.

Abstract:Coordinated attack is the upmost cooperative style of the cooperative aerial combat, fire control of weapon launch is the foundation of coordinated attack. Command targeting method of weapon launch with friend fighter information sustain is proposed for the requirement of coordinated weapon launch. Firstly, a vector model of coordinated targeting is established, and targeting command computing method as well as targeting control method is given based on the space location and gesture locating information. Then, a targeting precision analysis model is established based on the precision of target information, fighter space location, and information delay as well as the targeting posture, and the application requirement is given. Finally the simulation result shows that the targeting information and fighter location precision have a direct influence on the coordinated attack effect, and the enhancement in the performance of fighters is the key factor to improve the efficiency of coordinated attack.

Abstract:Aimed at the existing problems in the traditional track initiation algorithm applied in the near space hypersonic target track initiation, a feasible multi-rules fast track initiation method is proposed. On the basis of analyzing the motion characteristic of near space hypersonic target, first the noise interference is reduced by the height constraint and speed constraint and the possible track is set up. Then, by using the velocity constraints and acceleration constraints the candidate track is established, and finally through the angle constraint V track is eliminated and the true path is determined. The Monte Carlo simulation results show that the use of the method can initiate near space hypersonic target tracks in the clutter environment, and has a high correct track initiation probability, low false track initiation probability and short average track initiation time. The method has a good prospect in engineering application.

Abstract:Under the background of condition-based maintenance in the arming maintenance, in allusion to problem of the less equipment data swatch, the fault prognostic method based on least squares support vector machine is studied. The idea of artificial fish swarm algorithm is used to replace the function of the employed bees in the artificial bee colony , therefrom AFS-ABC algorithm is advanced and then used to optimize the parameter of LS-SVM. The LS-SVM is trained by the front forty voltage data sequence swatches of the power supply module in avionics subsystem, and tested by the rear fifteen data sequence swatches. The simulation is done by using the MATLAB LS-SVM toolbox. The result of the simulation shows that the use of this method can prognosticate the arming fault and preferably enhance the capability of LS-SVM.

Abstract:According to the route planning of air-to-ground attack of a fighter, this paper proposes a model of programming the air-to-ground airline based on PSO. Because the traditional arithmetic is low in constringency precision, based on the algorithm parameters and iterative expressions, the traditional algorithm is improved. Through constructing a variety of constrain conditions during attacking and fighting, such as antiaircraft fire, landform, technique and tactic performance of fighters etc., VC++.NET is used to conduct the algorithm simulation and the optimal airline is shown in MATLAB. The result suggests that the optimal route programmed by the modified PSO has a better performance of avoiding the threat, which satisfies the requirement of constrain technique and tactic performance and shorter voyage of fighters. And furthermore, the planning is better and higher in efficiency and precision.

Abstract:As to the detecting area, the single station detecting far range and low range model is proposed, and the detecting space of the network radar is studied based on that. As to the locating capability, a 3-D space time-difference-of-arrival (TDOA) position system is introduced, and the geometric dilution of precision of the system is analyzed. Taking the jamming aircraft as the typical target of passive radar, the detecting and the locating ability of the passive radar is simulated and analyzed separately by quantitative method. The referred methods above and the conclusions are meaningful to ascertaining the future requirement and the deployment and the application of the passive radar system.

Abstract:A new anti-missile campaign scheme evaluation method based on phase weight and probability potential is proposed. Firstly, on the basis of analyzing existing evaluation methods, the scheme phase dynamic evaluation idea is brought up and the phase weight measurement formula is designed. Moreover, the campaign scheme evaluation index system and index measurements are constructed; and combined with relative certain probability potential, relative optimism probability potential, relative pessimism probability potential and generalized potential, the detail steps of new method are designed. Finally, the performance of the new method and its detail steps are verified and analyzed, the result shows that the new method not only can solve the anti-missile campaign scheme evaluation problem, but also can help commander to make an optimization decision with preference information.

Abstract:In order to solve the problem of long range detection and discrimination of the anti-tactical ballistic missile (TBM), this paper proposes an operational concept that the targets will be detected based on the coordination the near space platform with radar. The Characteristics of the near space and the attenuation of IR transmission by space atmosphere are analyzed qualitatively. Taking the platform altitude, telluric curvature, atmosphere IR transmission characteristic and so on into account, the near space atmospheric transmittance model of IR transfer is set up. On the basis of above, the IR model of Midcourse TBM Based on Near Space Detection is designed. Finally, the model is simulated mathematically with MATLAB. The simulation results verify the effectiveness of near space atmospheric transmittance model and simultaneously indicate that the IR detecting ability of the TBM is very strong for the near space platform in given altitude.

Abstract:A location algorithm for near space radar networks based on angle information is researched in this paper, firstly, the relationship equations of target and radar stations are translated into linear equations based on geometric relationship, and the least-square solution including noise is found. And then the location issue is transformed into unconstrained extremum problem by the way of maximum likelihood estimation, taking the least-square solution as an initial value, the more accurate positioning solution is worked out using DFP algorithm, and the detailed process is given at the same time. Finally, the expression of geometric dilution precision (GDOP) is deduced, and simulation analysis for the performance of the algorithm and the location accuracy is presented, all of this proves that the algorithm is effective.

Abstract:When the hitting range of TBM is greater than a certain degree，the earth's rotation will have a huge impact on the error of trajectory prediction，The kinds of factors that give rise to errors are so many that it's hard to analyze the errors intuitively. In order to analyze the influence of the earth's rotation on the process of trajectory prediction，a random point is selected as the datum point after the rocket engine is shut down in this paper，the coordinate and the velocity vector of this point are obtained. Based on the coordinate system established，the process of the trajectory prediction is decomposed through coordinate transforming and the parameter calculation of midcourse，the trajectory prediction models are established based on the datum point，these models are practical and easy to be realized in engineering. Three-dimensional coordinates of TBM at random time can be predicted through these models after it is detected. We use the data of the trajectory whose hitting range is greater than 1000 kilometers to simulate and to analyze the error of trajectory prediction. The result proves that the earth's rotation will have an impact on the trajectory prediction.

Abstract:In order to resolve the shortcoming of the federated Kalman filter, the combination of the standard Kalman filter method and the confidence weighted method is applied in the integrated navigation system. In the method the advantages of Adaptive-Network-based Fuzzy Inference System: non-linear; fast and real-time; adaptive learning are used to compute the confidence of filters' output data, then get the weighting factor of subsystems, and then fuse with these weighting factors to compute the comprehensive outputs. The simulation result shows that the new algorithm prevents the divergence of data effectively and the precision of navigation is improved.

Abstract:It is necessary to build a mathematical model about dynamic scattering section of warhead fragments which fits in with complex encounter condition between missile and airplane, in the designing phase of missiles. According to the corresponding relation "Static state→Dynamic state 1→Dynamic state 2" between the dynamic scattering section and static scattering section of warhead fragments, and the encounter parameter between missile and airplane target, a method for calculating the dynamic scattering speed and density of the warhead fragments is studied by searching the keys according to the way of "Dynamic state2→Dynamic state 1→Static state" with computer. The multi-value problem of warhead fragments dynamic scattering section is lucubrated, and a new method of multi-value solution of dynamic scattering section of warhead fragments is advanced, which fits in with complex conditions such as big static state scattering angle range of fragments, the fragments static state scattering direction slope forward or back. A new opinion about multi-value problem that the maximum amount of keys is four is educed. The correctness of the new opinion is verified through simulation examples.

Abstract:Early damage is the main factor that causes the metal structures fracture suddenly. Aimed at the condition that most of the non-destructive testing methods can only be used to detect the macro-defect formed already, but cannot be used to detect yet to microscopic defects, the metal magnetic memory testing technology can only be used to qualitatively determine the location of the zone of stress concentration but can't be used to perform quantitative evaluation of the stress concentration zone, a method of combining simulation and experiment together is adopted to the research on the metal magnetic memory quantitative detection technology. A three dimensional force of Magnetic coupling model is established to simulate the three dimensional magnetic field distribution of the microscopic defects and research on the relationship between the stress, microstructure defect size, scan path of magnetic and magnetic memory signals. A metal magnetic memory testing system is constructed and the study of the relationship between the scan path and magnetic memory signals is performed. The experimental results and simulation conclusions are basically the same, and the use of the metal magnetic memory test technology can realize quantitative detection of the early microscopic defects.

Abstract:In the application of airborne single-observer passive wireless radio frequency injection location, both the observation vector and coefficient matrix are noisy, the application of the typical least square (LS) algorithm will make the location estimation biased. Furthermore, such general batch processing algorithm is rather complicated and needs large amount of computation which fails to comply with the real-time requirement of passive location. Therefore, a recursive total least squares (RTLS) algorithm is proposed. At first, airborne passive bearing location model is build.Based on the above an augmented matrix made up of coefficient matrix and observation vector is introduced, then the recursive equations of the augmented inverse correlation matrix and the most right singular vector are obtained according to the properties of matrix decomposition. Simulation results show that convergence rate and location accuracy of RTLS algorithm are better than those of RLS algorithm and TWDRLS algorithm, and the real time estimation of TLS algorithm is achieved, which can meet the requirement of location.

Abstract:The passive sensors can only obtain angle information, and cannot obtain the location information of the target. Therefore, the target tracking of a single passive sensor is difficult to meet observability conditions. The thesis focuses on the expansion of the measurement of the single passive sensors Gaussian-Hermitian filtering, and establishes the multiple passive sensors Gaussian-Hermitian filtering model. A larger model error will be caused by the strong motorization due to that the Singer model is only applicable to the target motion within the range of the uniform and uniformly acceleration. Besides, normal truncated model is a better practical model which is essentially the nonzero mean time model, and can more truly reflect changes of motorized range and intensity of the target. The thesis based on normal truncated model proposes the dual passive sensors Gauss-Hermitian maneuvering target tracking algorithm of the angle measurement, and the simulation results show that the method is capable of stably tracking the maneuvering target.

Abstract:Towards the complex channel environment and the inter-carriers interference (ICI) caused by Doppler frequency offset, a time domain adaptive algorithm based on normalized least mean square (TD-NLMS) is proposed to eliminate the interference caused by the carrier frequency offset (CFO) in aeronautical mobile communication OFDM system. In this algorithm, the CFO in time domain is estimated and compensated, and then the residual CFO is eliminated with TD-NLMS method. The simulation results show that in the aeronautical mobile channel environment, the use of the proposed algorithm can not only compensate the phase rotation, but also reduce the bit error rate to improve the accuracy and eliminate the CFO compared with that of the least square (LS) algorithm.

Abstract:In a landing system, each airplane's asking signal contributes to the interference seen by the other airplanes when it is ranging through asking-replying. In a given condition of limited available power, a reliable and effective power control strategy is needed. According to whether the ground station transmits instructions of power control, this research is made up of two parts. With no communication power control method, the equation of transmitting power is deduced and the shortage of the method is analyzed. The research places emphasis on the analysis of power control of fixed step and based on Nash game in the situation that the ground station needs to transmit instructions. Every method above has been simulated and the advantages and disadvantages are expatiated respectively through comparison. The method based on Nash game has a faster constringency and transmitting power stays at a lower level than fixed step, which means that the use of the method based on Nash game reduces the transmitting power and saves energy. So the method can meet the demands of high dynamic body like airplane. This scheme may provide a reference for the choice of power control strategy.

Abstract:For improving real-time accurate strike capability and the low delay transmission in high traffic-load of new data link in the modern battlefield, the MAC layer adopts an improved algorithm named Priority Statistic based on Multichannel Access Method（PSMC ）with Ad Hoc network as a basis. In the protocol the mode of comparing the priority threshold value with the channel occupancy statistics is adopted to determine whether to transmit the data or not. Also mini-slot and cell are adopted to protect data transmission reliability. Simulation results show that PSMC protocol can ensure that successful sending of data be maintained at the level of very low delay and satisfy the QoS of every Priority, especially provide real-time, safe guarantee for the high-priority. Compared to classic protocol of ALOHA, Slotted ALOHA, the results show that PSMC can carry heavy traffic load and ensure high throughput. Even in the case of overloading, it also can go on working with throttling back traffic.

Abstract:Speaker recognition is a kind of biological authentication technology which distinguishes speakers' identity by matching the voice distilled beforehand. However, the noise circumstance is an obstacle disturbing this technology walking up to practicality. Concerning the shortcoming of poor speaker recognition performance in noisy environments and combining the advantages of wavelet transform, a method of combining the wavelet transform technology with the traditional characteristic parameter extraction mode is proposed. In this method, the speech signal is decomposed by the wavelet, and then wavelet coefficients are processed by threshold. Only the data above the threshold are retained. The traditional characteristic parameters of little correlation are extracted to use as the input vector of the speaker recognition system. The simulation results indicate that the use of the method can better identify the speaker. A higher recognition rate can be obtained through the wavelet transform first and then the extraction of characteristic parameters. The application of this method greatly improves the performance of the speaker recognition system

Abstract:It is very important to make a scientific optimum decision on the repairable spare parts inventory allocation for complex equipment, and seek the best balance between spare parts cost and availability in maintenance. Thus, the focus of this paper is on the analysis of multi-echelon spare parts inventory system, the goal of it is to build a multi-echelon spare parts inventory model, evaluate the related parameters and inventory index, and develop ant colony optimization algorithm (ACO) in order to identify stocking policies to minimize system-wide spare parts support cost subject to the average waiting time per demanded part at each of the locations. The experiment gives insights into the relative improvement achievement achieved by applying lateral transshipments.