一种互耦和相干源条件下的DOA估计方法

A Method for DOA Estimation in the Presence of Mutual Coupling and Coherent Signals

空间平滑算法是一种常用的解相干处理方法,而阵元间互耦的存在会导致空间平滑算法失效,从而无法准确估计相干源DOA。针对这个问题,文中提出了一种新的DOA估计方法。该方法基于信号子空间和噪声子空间的正交性原理,利用入射信号源中的独立信号源可以有效估计出互耦矩阵,再通过估计的互耦矩阵对接收数据协方差矩阵进行互耦补偿,克服了互耦对空间平滑算法的影响,从而保证了相干源DOA能准确估计。计算机仿真实验表明了该方法的有效性。

Spatial smoothing algorithm is a common decorrelation method. However, its performance can be greatly degraded by the mutual coupling between array elements, thus the DOAs of coherent signals can not be estimated precisely. Aiming at this problem, a new method for DOA estimation is proposed in this paper. Based on the orthogonal character of signal and noise subspace, this method can estimate the mutual coupling matrix effectively with independent signals. Then the mutual coupling can be compensated and its negative effect on spatial smoothing can be overcome. So that the DOAs of coherent signals can be estimated precisely. Computer simulations are conducted to show that this method is effective.