一种新的互耦条件下宽带信号DOA估计算法  

A Novel DOA Estimation Methed for Wideband Signals in the Presence of Mutual Coupling

作　　者：张进[1] 刘伟[1] ZHANG Jin LIU Wei(Electronic Engineering Institute, Hefei 230027, Chin)

机构地区：[1]电子工程学院,合肥230027

出　　处：《微波学报》2017年第3期28-31,共4页Journal of Microwaves

基　　金：国家自然科学基金(61671453);安徽省自然科学基金(1408085MF128)

摘　　要：基于一致聚焦和Khatri-Rao子空间的思想,提出了一种新的互耦条件下宽带信号DOA估计算法。首先,通过在阵列两端设置辅助阵元来补偿各个频率处的互耦效应;接着,对补偿后的协方差矩阵进行一致聚焦操作,并重排成一个高维矩阵;最后,通过搜索Khatri-Rao子空间谱估计出宽带信号的DOA。算法适用于互耦未知的场合,对宽带信号频率谱是否平坦没有要求,且在互耦自由度较小时能够分辨多于阵元数的宽带信号。计算机仿真结果证明了算法的有效性。Based on the idea of consistent focusing and Khatri-Rao subspace, a new wideband DOA estimation method for wideband signals is proposed in the presence of unknown mutual coupling. Firstly, the effect of mutual coupling at each frequency can be compensated by setting several auxiliary elements on each side of the array. Then, by applying consistent focusing operation on the compensated covariance matrices, a higher dimensional matrix is thus formed by rearranging the fo- cused covariance matrices. Finally, the DOAs of wideband signals can be estimated by searching the Khatri-Rao subspace spectrum. The proposed method can be suitable to the scenario that the mutual coupling is unknown, and does not require that the frequency spectrum of wideband signals is flat. Moreover, it can resolve more signals than the number of array ele- ments when the freedom degree of mutual coupling is small. Simulations results demonstrate the effectiveness of the proposed method.

关 键 词：DOA估计 宽带信号 互耦 一致聚焦 Khatri-Rao子空间 

分 类 号：TN911.23[电子电信—通信与信息系统]