多径条件下均匀线阵DOA估计及互耦误差自校正

A DOA Estimation and Mutual Coupling Self-calibration Algorithm for Uniform Linear Array in the Presence of Multipath

针对多径信道环境下存在互耦误差的均匀线阵,提出了一种联合波达方向估计及互耦误差自校正算法。在不改变阵列互耦误差的条件下,首先利用虚拟阵列平移预处理方法,将相干信源协方差矩阵恢复到满秩。进而利用互耦误差的对称Toeplitz特性,基于子空间原理构造一代阶函数,采用秩损的方法得到互耦误差条件下的DOA估计及阵列互耦误差。数值仿真结果表明,该算法具有良好的DOA估计性能与互耦误差自校正性能。

To solve mutual coupling of uniform linear array（ULA） in the presence of muhipath channel, a joint Direction of Arrival（DOA）estimation and mutual coupling calibration algorithm is proposed. Firsfly~ coherent source covariance matrix is restored to full rank via the preprocessing method of virtual array moving without changing the mutual coupling. Then a cost function is constructed based on subspace theory and is minimized by rank loss method to estimate the DOA of the signals and mutual coupling error using the＇ Toeplitz structure of the covariance matrix for ULA. Simulation results show that the algorithm has effective performance for DOA estima- tion and mutual coupling self- calibration.