基于極化分集技術(shù)的雷達(dá)抗干擾與優(yōu)化檢測(cè)研究
[Abstract]:Radars in modern warfare are confronted with the problems of low altitude, ultra-low altitude penetration, noise and clutter detection. With the development of radar technology, polarization information of scattered echoes can be used to improve the performance of radar systems by new polarization radar systems. It can utilize horizontal and vertical polarization (or left-handed and right-handed circular polarization) without fully exploring the ability of polarization information processing. The newly developed polarization radar can emit pulses of arbitrary polarization. In this paper, the anti-jamming and adaptive optimization detection algorithm based on polarization diversity technology is studied for the existing problems in radar anti-jamming and detection. The main research contents include: For low-altitude, ultra-low-altitude penetration of low-altitude mirror angular glint interference, symmetrical polarization diversity cancellation algorithm is studied to suppress interference; Polarization and waveform adaptive optimization detection algorithm is studied in uniform, partially uniform noise environment and non-uniform clutter environment. An efficient Taguchi optimization algorithm is introduced to solve the parameter optimization problem in this algorithm. Firstly, the suppression of low-altitude mirror angular glint interference caused by low-altitude and ultra-low-altitude penetration is studied. The formula of angular scintillation line deviation including phase, amplitude and polarization parameters is obtained by using two-point source scintillation model; then the relationship between angular scintillation line deviation function and polarization parameters is studied, and the extremum points are obtained by Taguchi optimization algorithm with high efficiency, and then the symmetrical polarization diversity design is carried out near the extremum points to ensure each polarization parameter. The simulation results show that the proposed symmetrical polarization diversity cancellation algorithm is more effective than other methods in suppressing the low-altitude mirror angular glint interference. Then, we study the in-equalization algorithm. The problem of optimal detection of GLRT and AMF detectors in uniform noise environment is studied. By studying the monotonicity of detection performance of two detectors with a certain parameter, this paper applies the equivalent decomposition of parameters containing polarization information to improve detection efficiency while the detection performance remains unchanged. This polarization decomposition method makes multiplication of the algorithm. The number of operations increases linearly with the increase of the square of the parameters, which can greatly improve the detection efficiency. It is also found that this parameter is closely related to the waveform and polarization information. Therefore, two waveform design schemes are proposed, and a joint optimization detection algorithm based on two detectors adaptive polarization and waveform design is proposed. The optimization detection problem is transformed into a multi-parameter joint optimization problem, and then Taguchi optimization algorithm is applied to solve the optimization problem. Simulation results show that the detection performance and efficiency of the proposed algorithm in uniform noise environment are greatly improved compared with other algorithms. Thirdly, this paper studies ASD, Rao Test and Rao Test in partially uniform noise environment. The monotonicity of detector detection probability is studied. Then a polarization optimization detection algorithm is proposed to improve the detection performance of Wald Test detector. Finally, the polarization decomposition algorithm and the adaptive polarization and waveform design joint optimization detection algorithm are applied to ASD, Rao Test and Wa simultaneously. The simulation results show that the proposed algorithm is effective in improving the detection performance. Finally, the joint optimization detection algorithm of adaptive polarization and waveform design in inhomogeneous clutter environment is studied. Firstly, a signal detection model including inhomogeneous clutter is introduced, and then a needle is cited. Logarithmic GLRT detectors with very stable nonuniform clutter are suitable for target detection in nonuniform clutter environments because their decision ability depends only on primary data and does not depend on secondary data, target or clutter prior data. The proposed algorithm is applied to the logarithmic GLRT detector to improve the performance of target detection. Simulation results show that the performance of the proposed algorithm is greatly improved compared with other algorithms.
【學(xué)位授予單位】:哈爾濱工程大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2014
【分類號(hào)】:TN974
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