互耦情况下柱面共形阵的波达方向估计

DOA estimation for cylindrical conformal array under mutual coupling

针对柱面共形阵存在互耦时的波达方向估计问题,提出一种测角同时校正误差的新算法.首先将互耦误差矩阵进行分块;然后利用子阵是均匀圆阵的特殊结构,得出子阵内部和子阵之间的互耦均具有循环带状Toeplitz特性;最后构造重构矩阵解耦角度和互耦系数,从而进行级联估计.该算法无需进行迭代计算,不存在局部收敛问题,也不需要额外的辅助信源、辅助阵元以及任何互耦误差的先验信息,简单易实现.仿真结果表明,所提算法测角精度高,误差校正效果好.

Aiming at direction of arrival(DOA)estimation when there is mutual coupling in cylindrical conformal arrays,this paper proposes a new algorithm for both measuring angles and correcting errors.Firstly,the paper partitions the mutual coupling error matrix into blocks,and then uses the special structure in which the sub-matrices are uniform circular arrays to produce the result that the mutual coupling within and between the sub-matrices is characterized by cyclic strip Toeplitz.Finally,the paper structures the reconstruction moment to decouple angles and mutual coupling coefficients so as to make cascading estimates.The algorithm does not need iterative computation and does not have local convergence.No additional auxiliary sources,auxiliary array elements or any prior information of mutual coupling errors are required.It is simple and easy to implement.Simulation results show that the proposed algorithm has high angle measurement accuracy and good error correction effect.