基于交替迭代的混合信号DoA与ULA互耦误差估计算法

An Algorithm for Estimating DoAs of Mixed Signals and Mutual Coupling Error of ULA Based on Alternative Iteration

针对互耦条件下均匀线阵(Uniform Linear Array,ULA),该文基于交替迭代提出一种适用于混合信号模型的波达方向(Direction of Arrival,DoA)与互耦误差估计算法。算法首先利用ULA互耦矩阵的带状Toeplitz结构,提出一种基于门限的非相干信源DoA估计方法,进而实现互耦误差初步估计;在此基础上,以交互迭代方式实现混合信号DoA估计及互耦误差更新。算法最多只需二次交互迭代,就可实现收敛。计算机仿真结果表明:该算法在较少接收快拍数及低信噪比情况下,均具有良好的DoA及互耦误差估计性能。

Based on alternative iteration,an algorithm is proposed to estimate the DoAs of mixed signals and mutual coupling error for Uniform Linear Array（ULA）.In the algorithm,utilizing the Toeplitz structure of the mutual coupling matrix of the ULA,a threshold-based method is presented and used to estimate initially the DoAs of the incoherent signals in mixed signals,and then the corresponding mutual coupling error is achieved.On the basis of this,the DoAs of the mixed signals is estimated and the mutual coupling error is updated in an alternative iteration mode.The overall algorithm can achieve the convergence with at most two times alternative iterations.The computer simulation indicates that the algorithm has good performance of DoA and mutual coupling error estimation even with less receive shotsnaps and in lower SNR region.