DRFM间歇采样转发式干扰辨识算法研究

Research on DRFM Repeater Jamming Recognition

基于数字射频存储器(DRFM:Digital Radio Frequency Memory)的间歇采样转发式干扰与雷达发射信号相参,可以获得部分脉压增益,同时具有压制与欺骗两种干扰效果,对现代雷达极具威胁。干扰辨识是进行有效干扰抑制的前提。本文提出一种滑动截断匹配滤波(STMF:Sliding-Truncation Matched Filter)方法,通过对匹配滤波器的参考窗宽度和延时进行二维搜索,输出脉压后的二维幅度分布;然后,基于该幅度分布对干扰切片宽度和转发周期进行估计;并通过分析切片宽度与转发周期之间的关系,实现典型转发式干扰的辨识。仿真结果显示该方法在干噪比(INR:Interference to Noise Ratio)大于5 dB时,正确辨识率不低于90%。

Digital radio frequency memory （DRFM） repeater jamming is coherent with the radar transmitting signal, thus can obtain partial pulse compression gain. The jamming can achieve effects of both deception and suppression, which makes it a big threaten to modern radar. Jamming recognition is the precondition of jamming suppression. Hence a jamming recognition method based on sliding-truncation matched filter （STMF） was proposed in this paper. With two dimensional search of time delay and window width of the matched filter, the amplitude distribution can be obtained. With this ampli- tude distribution, the jamming chip width and interleaving times can be estimated and then the jamming type can be recog- nized. The simulation results shows that when the interference to noise ratio is larger than 5 dB, recognition rate better than 90% with this method.