阵列互耦条件下相干信源DOA估计算法研究

Research into DOA Estimation Algorithm of Coherent Signal Source under The Condition of Array Mutual Coupling

针对阵列互耦条件下相干信源到达方向(DOA)估计的问题,利用均匀线阵互耦矩阵的带状循环特性及对称Toeplitz性,提出了一种基于改进的空间平滑算法的信源DOA估计算法。该算法无需阵元的互耦参数信息,只需一维谱峰搜索,避免了通常多参数联合估计的多维非线性搜索及迭代运算;由于采用改进的空间平滑算法,所以该算法具有很好的统计估计性能。计算机仿真结果验证了该算法的正确性和有效性。

Aiming at the problem of direction of arrival（DOA） estimation of coherent signal sources under the condition of array mutual coupling,this paper presents a kind of DOA estimation algorithm of signal sources based on the improved spatial smoothing algorithm by using the strip circulation characteristic and symmetrical Toeplitz characteristic of the mutual coupling matrix of uniform line array.The proposed algorithm need not know the information of coupling parameters of array elements but one-dimensional spectrum peak search,which avoids the multi-dimensional nonlinear search and iterative operation of the common multi-parameter joint estimation.Because of using the improved spatial smoothing algorithm,the algorithm has perfect statistical estimation performance.The correctness and effectiveness of the proposed algorithm are verified through the computer simulation results.