无源雷达探测中的直达波提取方法

摘要

直达波作为无源雷达探测系统中的参考信号,在传输过程中受到多径杂波和噪声的干扰,从而对系统的探测性能产生影响.利用参考通道接收到的混合信号中直达波的能量最大这一现实,提出用主分量分析的方法对混合信号进行降维处理,通过保留主分量,舍弃次分量,达到了提取直达波的目的.仿真结果表明:该方法可以有效的从噪声干扰和多径干扰中提取直达波,提纯效果较好,且操作简便易行.%The direct-path-wave as the reference signal is affected by multi-path interference signals and noise in the passive radar detection system, and further influence the performance of the detection system. By adopting the reality of the direct-path-wave has the highest energy. A method of principal component analysis is proposed, which can reduce dimension of the mixed signals, retain the principal components, abandon the minor components, achieve the extraction of direct-path-wave aim. The simulation results show that the method can extract the direct-path-wave efficiently from the multi-path interference signals and noise,has the better extraction effect,and the method is simple.