对抗SAR-GMTI的方位向间歇采样延时转发干扰方法

Azimuth Intermittent Sampling Time-delay Repeater Jamming Method Against SAR-GMTI

针对常规SAR干扰方法对多通道SAR-GMTI干扰无效的问题,提出对抗SAR-GMTI的方位向间歇采样延时转发干扰方法,并针对中心假目标仍被完全抑制的问题对干扰方法进行多普勒移频改进。该方法利用方位向间歇采样实现多普勒频谱的周期性拓延,从而形成不能被SAR-GMTI对消的多个方位向假目标,并通过快/慢时间延时转发控制假目标的移位。理论分析和仿真实验表明:方位向间歇采样延时转发干扰可在多通道SAR-GMTI成像中形成二维灵活可控的方位向假目标串,同时假目标幅度受正弦调制函数的影响出现增强和削弱现象,多普勒移频改进可充分保留低阶假目标。

Aiming at the problem that traditional SAR jamming method does not work against the multi channel SAR GMTI,an azimuth intermittent sampling time delay repeater jamming method for countering the SAR GMTI was proposed,which was improved with Doppler shift to overcome the problem that the central false target was restrained totally.This method generated seasonal expansion of the Doppler spectrum to produce more false targets which could not be restrained by SAR GMTI,and controlled the false targetsdisplacement through fast/slow time delay repeater.Theoretical analysis and simulation showed that azimuth intermittent sampling repeater jamming could produce controllable multi false targets for multi channel SAR GMTI imaging,but the amplitudes of false targets were enhanced and weakened under the influence of sinusoidal modulation function,and Doppler shift could help retain low order false targets adequately.