Laser guidance radar anti-high-repetition-frequency jamming technology based on random repetition-frequency signal
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摘要: 为了能有效对抗高重频干扰，在分析高重频干扰破坏激光制导雷达信号处理机理的基础上，采用了随机重频照射激光波形，并利用激光目标指示器、目标和探测器的先验距离、速度特征，提出了基于自适应交叠波门的高重频干扰信号排查和鉴别方法，有效控制了重频干扰对目标捕获环节的影响，形成一套从波形设计到信号处理、目标捕获的端到端的抗高重频干扰解决方案，并进行了理论分析和实验验证。结果表明，在不同干扰场景下，有效捕获目标的时间均低于0.2 s，捕获时间在亚秒量级，与无干扰背景下目标典型捕获时间相当。此技术可有效对抗数十赫兹到250 kHz的固定/随机重频干扰，有利于提高制导武器对抗重频干扰的能力。Abstract: In order to effectively counteract high-repetition-frequency jamming, a solution based on the analysis of the destructive mechanism of high-repetition-frequency jamming on laser guided radar signal processing was developed. The solution involves the use of randomly modulated laser waveforms and incorporates prior knowledge of the distance and velocity characteristics of the laser target indicator, target, and detector. A high-repetition-frequency jamming signal identification and discrimination method was designed based on adaptive overlapping wave gates, effectively controlling the impact of repetition-frequency jamming on the target acquisition process. It provided an end-to-end solution for combating high-frequency jamming, from waveform design to signal processing to effective target capture. The proposed solution was theoretically analyzed and experimentally verified. The results show that in different interference scenarios, the effective capture time is consistently below 0.2 s. The effective capture time is in the sub-second range, comparable to the typical capture time under no jamming background. This technology can effectively counteract fixed/random frequency jamming ranging from tens of Hertz to 250 kHz, enhancing the capability of guided weapons to counter high-repetition-frequency jamming.
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图 7 受到200 kHz高重频干扰的目标回波
Figure 7. Target echo under 200 kHz high-repetition-frequency jamming
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图 8 从200 kHz高重频干扰中提取的目标回波
Figure 8. Target echo extracted from 200 kHz high-repetition-frequency jamming
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图 9 不同固定/随机频率干扰下目标平均捕获时间
Figure 9. Average target acquisition time under different fixed/random frequency jamming
表 1 干扰场景参数设置
Table 1 Jamming scenario parameters configuration
jamming types transmitted signal jamming frequency/kHz experiment fixed frequency random frequency distributed between 20 Hz~30 Hz 0.02, 0.5, 10, 100, 200, 250 10000 trials per frequency 
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