【摘要】 针对强信号邻近时弱信号的波达方向(DOA)难以准确估计问题,提出了一种基于伪协方差矩阵的强弱邻近信号DOA估计方法。通过重新排序大特征值来构造伪数据相关矩阵,然后对新的相关矩阵进行匹配波束形成,最后与MUSIC谱叠加形成伪空间谱。理论分析与仿真实验表明,所提方法在增强弱信号的同时能够有效抑制强信号,显著提高了分辨强弱信号的能力。更多还原

【Abstract】 Aiming at the problem that the direction of arrival(DOA)of weak signals can’t be estimated accurately when the strong signals are adjacent,this paper puts forward a DOA estimation method based on pseudo covariance matrix when the strong signals and weak signals are adjacent.The pseudo data correlative matrix is constructed by rearranging the large eigenvalues,then the matching beam forming is performed to new correlative matrix,finally pseudo spatial spectrum is formed by superposing with the multiple signal classification(MUSIC)spectrum in this paper.The theoretical analysis and the simulation results show:the proposed method not only enhances the weak signal,but also suppress the strong signal effectively,and improve the capability to distinguish strong signal and weak signal greatly.更多还原