多通道SAR-GMTI二维间歇采样延时转发干扰

摘要

为充分降低合成孔径雷达地面动目标显示(synthetic aperture radar-ground moving target indication,SAR-GMTI)对地面重要运动目标的威胁,本文在SAR间歇采样转发干扰技术基础上,针对多通道SAR-GMTI提出了二维间歇采样慢时间延时转发干扰方法.该方法利用二维间歇采样实现干扰信号的二维频谱周期性拓展,从而生成无法被SAR-GMTI完全对消的假目标群,并进一步提出采用慢时间延时转发来实现对假目标群方位向位移的控制.在此基础上,针对SAR-GMTI的对消特性给出了多组延时转发干扰应用模型.理论分析和仿真实验表明:该方法可对多通道SAR-GMTI产生二维假目标群,且假目标幅度受正弦调制函数的影响出现增强和削弱,多组延时转发干扰方法可以实现增强区与削弱区互补,从而形成分布更密集、覆盖范围更广的二维多假目标干扰效果.%To help the ground important moving targets reduce the threat from synthetic aperture radarground moving target indication (SAR-GMTI) adequately,based on the intermittent sampling jamming technology to SAR,the two-dimensional (2-D) intermittent sampling slow time-delay repeater jamming method aiming at countering multi-channel SAR-GMTI is proposed.This method leads to the seasonal expansion of 2-D frequency spectrum of the jamming signal through 2-D intermittent sampling,which directly generates the group of false targets that cannot be restrained by SAR-GMTI totally.And using slow time-delay repeater is further put forward to control the false targets' azimuth position.Based on this,the multiple-unit time-delay repeater jamming application model is given to deal with the cancelling character of SAR-GMTI.Theoretical analysis and simulation show that this jamming method can produce 2 D multiple false targets for multi-channel SAR-GMTI,and the amplitudes of false targets are influenced by the sinusoidal modulation function,bringing out enhanced and weakened areas.The multiple-unit azimuth time-delay repeater jamming can make the enhanced and weakened areas complement each other to produce more compact and wide 2-D group of false targets.