针对阵列雷达极化滤波器的干扰调制方案

Study of Full-Polarization Interference Modulation on Polarization Filter of Array Radar

极化域自由度不足、功率导向等缺陷使极化滤波器无法同时满足在干扰极化处设置零陷、在目标极化处设置尖峰的任务需求,这是干扰信号破坏滤波器正常工作的基本原理。干扰机可通过控制发射信号极化调制的方式、时序来阻碍雷达获得滤波器必需的、精确的目标、干扰极化参数和稳定相关的干扰和噪声参考数据,进而避免滤波器凹口对准干扰,保证有足够的干扰信号进入雷达接收机。先分析了多种极化滤波器的处理特点,并对多种干扰背景的滤波器输出性能进行了预测,得到了对抗各滤波器的最佳极化调制方案,并使用仿真实验加以验证。

Owing to the lack of polarization freedom and the power-driven,the polarization filter cannot meet the demand of setting notch at the interference and setting peak at the target simultane⁃ously.This disadvantage is considered as the fundamental of corrupting filter.The jammer can pre⁃vent the radar from obtaining the precise target,interference polarization parameters and stable related interference and noise reference data necessary for the filter by controlling the mode and se⁃quence of polarization of the transmit signal polarization modulation,which in turn prevents the filter notch from aligning with the interference and ensures that sufficient interference signal is received by radar receiver.We analyze the processing characteristics of various polarization filters and predict the filter output performance for various interference backgrounds to obtain the best polarization modula⁃tion scheme against each filter.The schemes are verified by simulation experiments.