基于分块子空间投影的无源雷达干扰抑制方法

Block subspace projection-based interference suppression in passive radars

为了解决GPS辐射源雷达各通道干扰抑制不彻底和计算量较大的难题,提出了基于分块子空间投影的干扰抑制方法,并对其性能进行分析.将回波通道的接收信号均匀分块后并行处理.首先,将信号投影到干扰子空间的正交补子空间内,完成多径干扰抑制;然后,给出强目标回波旁瓣干扰存在的判断准则;最后,将信号投影到强目标子空间的正交补子空间内,完成强目标回波旁瓣干扰抑制.仿真结果表明:与已有的子空间投影法相比,该方法干扰抑制更彻底、计算量更低、更适合实际应用.

Aimed at global position system（GPS） based passive radar systems,a blocking subspace projection method was presented to remove the disturbance residuals and reduce the computational cost.In both the reference and echo channels,the received signals were divided into several consecutive blocks,and processed in parallel.Firstly,the signals received in the echo channel were projected onto the orthogonal complement subspace of the disturbance subspace.Secondly,the existing criterion of the masking effect caused by the side-lobe of strong target echo was introduced.Finally,the signals were projected onto the subspace which was orthogonal to all of strong target subspace.This method has the advantages of interference suppression quality and computational simplicity in each block.The effectiveness of the algorithm was demonstrated by the simulation.