基于均匀圆阵的互耦误差校正算法研究

Mutual coupling error correction algorithm based on the uniform circular array

阵元之间的互耦效应严重影响了DOA的估计性能。基于均匀圆阵,提出了一种互耦条件下的波达方向估计和互耦误差自校正算法。利用带状循环矩阵的特性对均匀圆阵的互耦误差建立数学模型,再利用MUSIC算法和迭代法对互耦误差矩阵和波达方向同时进行估计,自校正方法无需任何辅助阵元即可实现两类参数的估计。仿真实验表明,算法很好地解决了均匀圆阵的互耦问题,能够比较准确地估计出波达方向角和互耦误差值。

Mutual coupling effect had a serious impact on the performance of DOA estimation between the array elements. Based on the uniform circular array, a DOA estimation and mutual coupling error self-correction algorithm was proposed under the condition of mutual coupling effect. The mathematical model of mutual coupling error was built which used the banded circulant matrix. Then, the mutual coupling matrix and DOA was estimated which used the MUSIC algorithm and iterative methods at the same time. Self-correction method did not require any auxiliary array element , and can implement two types of parameters esti-mates. Simulation result shows that the algorithm has a good solution to the problem of uniform circular array mutual coupling, and can estimate the DOA and mutual coupling error accurately.