改进的幅相重构算法抗主瓣干扰研究

Modified amplitude-phase reconstruction algorithm for mainlobe jamming suppression

主瓣干扰一直是雷达抗干扰技术难以解决的问题。实验发现常规幅相重构算法对非恒模干扰的抑制效果不好。针对主波束方向的压制性强干扰,采用滑窗改进的幅相重构算法进行抑制。即使干扰不完全具备恒模特征,也可以通过细化采样窗长估计此采样窗口内所有采样点的干扰幅度,然后每次滑动窗口估计下一个采样点的幅度信息,并且利用接收信号的单位向量逐点估计相位信息,及时解析重构干扰信号,最后从雷达接收的和信号中将重构得到的干扰消去,从而达到抑制主瓣干扰的目的。仿真实验获得较理想的干扰相消效果,此方法对雷达抗干扰能力的提升具有重要的意义。

Main lobe interference is always a difficult problem of radar anti-jamming technology to solve.Found that conventional amplitude-phase reconstruction algorithm for non-constant mode interference suppression has not worked.Modified amplitude-phase reconstruction algorithm with sliding window can be used to suppress main beam direction of strong interference in this paper.Even if interference without completely constant mode features,it was effect to estimate the amplitude of all sampling points within a sampling window through refinement sampling window length,then estimated amplitude information of next sampling point with each window sliding,and estimated phase information using unit vector of received signal by points,timely restore analytical jamming,finally eliminated reconstruction of jamming form received signal,so as to suppress mainlobe jamming.Simulation can obtain ideal interference cancellation effects,and this method for improving radar anti-jamming capability is of great significance.