基于回波互相关的拖引干扰抑制方法

Approach of Gate Pull-off Jamming Suppression Based on ECC

针对DRFM拖引干扰机诱偏火控雷达的距离波门问题，提出一种基于回波互相关的拖引干扰抑制方法。其主要步骤包括：对典型的匀速拖引干扰和匀加速拖引干扰进行数学建模，对包含目标回波和拖引干扰的雷达回波进行回波互相关，对雷达回波的互相关函数依次低通滤波和逆回波互相关。仿真结果表明：无论在匀速拖引干扰或匀加速拖引干扰环境下，该方法都能较好地抑制拖引干扰。当信噪比大于0 dB时，该算法干扰抑制深度比IPMF算法高3～5 dB，比ICC算法高8～10 dB，更加有效地抑制了拖引干扰，从而使火控雷达的距离波门始终套住目标回波，增加了武器的有效打击力。

According to the range gate of fire control radar controlled by the DRFM pull-off jammer, an approach of gate pull-off jamming suppression based on the echo cross-correlation （ECC） is proposed. The main steps are as follows. Firstly, mathematics modeling of gate pull-off jamming with constant velocity and acceleration （GPOJCV and GPOJCA） are investigated. Secondly, the cross-correlation function of radar echo is got by ECC, which contain target echo and GPOJCV （or GPOJCA）. Thirdly, after the low-pass filtering, the inverse echo cross-correlation （IECC） of radar echo is obtained. Simulation results show that both in the GPOJCV and GPOJCA environment, the approach can suppress jamming well; When the signal-to-noise ratio （SNR） is greater than 0 dB, the signal-to-jamming ratio improving factor （SJR IF） of this algorithm has about 3~5 dB higher than IPMF, and about 8~10 dB higher than ICC, which suppresses gate pull-off jamming to the most. So the target echo is always in the range gate of fire control radar. Finally, it increase the effective force of arms.