警戒雷达抗干扰设计与实现
[Abstract]:As an important part of radar information network, alert radar plays an important role in target detection and information supply. However, with the development of military electronic equipment and civil electromagnetic equipment, the electromagnetic environment of radar work is becoming more and more complex. Radar system is faced with various kinds of passive jamming and active jamming threats, and its accurate detection of targets is also facing a severe challenge. The basic way to solve the above problem is to improve the anti-jamming capability of warning radar. Based on the AD sampling and timing interface board and the general signal processing board based on DSP and FPGA, the anti-jamming algorithm modes for active jamming and passive interference are designed respectively in this paper. The anti-active jamming mode is mainly based on the low-repetition frequency conventional ranging mode, and the anti-active jamming algorithm is added on this basis, and the anti-passive jamming mode mainly aims at the ground object clutter in the passive jamming, designs the high-repetition frequency pulse Doppler mode. In this paper, the types and characteristics of active jamming are analyzed, and the algorithm principle of adaptive sidelobe cancellation and sidelobe hiding and its improved scheme are described. This paper introduces the realization flow of anti-active jamming mode software and the assignment of DSP tasks, and introduces the processing flow and processing timing of anti-jamming algorithm respectively. Finally, the suppression performance of suppression noise jamming and dense false target jamming before and after the improvement of anti-jamming algorithm are analyzed and compared in detail through the measured data. In this paper, the statistical and spectral characteristics of ground clutter are studied, and the principle of suppressing clutter through FIR filter banks is discussed. At the same time, the ambiguity of range and velocity in high repetition mode and its solution are analyzed. This paper introduces the software realization, task allocation and processing time sequence of high repetition frequency pulse Doppler mode, and provides an optimized scheme for filtering operation of FIR filter banks. Finally, the performance of clutter suppression and the feasibility of distance deblurring algorithm are analyzed based on the measured data.
【学位授予单位】:西安电子科技大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TN974;TN959.11
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