对线性调频步进频雷达相参干扰方法研究

Research on coherent jamming method for LFM stepped frequency radar

线性调频步进频雷达通过脉冲压缩和相参合成的双重信号处理可以获得高距离分辨力,而基于DRFM体制的传统微秒级延时叠加间歇采样干扰形成的假目标间距较大,无法进入雷达检测波门。在间歇采样单次转发干扰的基础上,提出一种基于FPGA时钟周期的纳秒级延时叠加+频率调制的干扰时序设计,可以在真实目标附近形成米级间距分布的多个假目标,达到对真目标有效压制干扰的效果。

LFM stepped frequency radar can obtain high range resolution through dual signal processing of pulse compression and coherent synthesis.The traditional microsecond delay superimposed intermittent sampling jamming based on DRFM system has large false target spacing and cannot enter the radar detection gate.Based on the intermittent sampling single forwarding interference,an interference timing design of nanosecond delay su⁃perposition+frequency modulation based on FPGA clock cycle is proposed,which can form multiple false tar⁃gets with meter spacing distribution near the real target,so as to effectively suppress the interference to the real target.