一种基于协方差矩阵重构和EMP的宽带波束形成算法

在宽带波束形成中，若干扰信号从主瓣方向进入，会引起主瓣畸变、旁瓣电平抬高，从而使波束性能严重恶化。为了解决波束形成中的这些问题，研究了一种基于协方差矩阵重构和特征投影预处理（EMP）的宽带波束形成算法。该算法首先通过EMP算法求取阻塞矩阵，对接收信号进行干扰相消预处理阻塞掉主瓣干扰；然后通过相干信号子空间（CSM）方法、协方差矩阵重构求取合理的协方差矩阵；最后进行波束形成。在主瓣干扰、旁瓣干扰同时存在的情况下，该算法能够自适应地阻塞主瓣干扰、抑制旁瓣干扰，解决了存在主瓣干扰情况下宽带波束形成的波形畸变问题。计算机仿真验证了该算法有效性。

Broadband beamforming algorithm based on covariance matrix reconstruction and EMP

Mainlobe interference can cause the distortion of the mainlobe and the increase of the sidelobe level in broadband beamforming. This paper developed a broadband beamforming algorithm based on EMP (eigen-projection processing) algorithm and covariance matrix reconstruction. This algorithm constructed a blocking matrix, preprocessed the echo signal. , then obtained an appropriate covariance matrix, finally formed beam. This algorithm could block the mainlobe interference and suppressed the sidelobe interference and solved the problem of waveform distortion in the presence of mainlobe interference and sidelobe interference. Simulation verify the effectiveness of the algorithm.