一种基于阵列虚拟平移的互耦自校正算法

A Self-calibration Algorithm for Mutual Coupling Based on Array Virtually Moving

阵元间的互耦和相干信源对阵列的DOA(Direction-Of-Arrival)估计性能产生了严重影响。针对这一问题,在应用子空间原理的基础上,利用均匀线阵互耦矩阵的带状循环特性及对称Toeplitz性,并结合阵列虚拟平移,提出了一种阵元互耦条件下的相干信源的波达方向估计新算法。该算法无需阵元的互耦参数信息,就可准确地估计出相干信源的DOA,估计性能优良,而且只需一维搜索,计算量较小。计算机仿真结果验证了该算法的有效性。

The presence of mutual coupling between elements and coherent signals severely degrade the performance of DOA estimation. To solve it, a robust subspace-based DOA estimation algorithm that bases on the special structure of coupling matrix in the presence of array coupling is proposed for ULA （Uniform Linear Array） in this paper. The new algorithm provides a favorable DOA estimation and estimated performance without any knowledge of the array coupling. Because of only referring to the one-dimensional search, our algorithm has fewer calculating burdens. Finally, Representative computer simulation results are given to demonstrate the effectiveness and behavior of the proposed method.