LFM雷达对抗移频干扰方法研究

The Research on LFM Radar Countering Frequency-Shift Jamming Methods

针对现有移频干扰对抗方法,分析得出基于回波匹配输出中心频率鉴别干扰适用范围有限、调频斜率捷变LFM(Slope Varying LFM,SV-LFM)波形能够一定程度抑制干扰,但需设计合理捷变方式的结论.同时,以LFM脉冲多普勒雷达抗自卫式移频干扰为背景,提出联合相参积累和二维分数阶傅里叶变换(Two Dimensional Fractional Fourier Transform,2D-FRFT)干扰鉴别方法,根据回波信号在两种处理方式下的峰值差异,对比门限鉴别目标真伪.仿真结果表明分析结论正确,所提方法可行有效.

By studying the existing methods for countering frequency-shift jamming,this paper comes to the conclusion that the applicability of jamming discrimination method based on echo matching output center-frequency is limited and slope varying LFM(SV-LFM),a radar transmitting waveform,can suppress the jamming to some extent,if the agile way is designed reasonable.Meanwhile,a jamming discrimination method jointing coherent integration and two dimensional fractional Fourier transform(2D-FRFT)is proposed on the background of LFM pulse Doppler radar countering self-screening frequency-shift jamming.According to the peak value difference of echo signal under the two processing modes,true and false targets are identified by comparing with a setting threshold.Simulation results show that the conclusion is correct and the proposed method works effectively.