基于均匀圆阵的幅相误差自校正算法

Amplitude and Phase Error Auto-Calibration Algorithm Based on Uniform Circular Array

针对实际应用中普遍存在的阵列幅相误差扰动问题,结合子空间类波达方向估计算法,以均匀圆阵为基础,提出了一种幅相误差的自校正算法。先利用均匀圆阵协方差矩阵的结构特点对幅相误差进行初步估计,再通过迭代方法得到更精确的估计值,自校正方法无需任何参数初始值,实现比较简单。仿真实验验证了算法具有良好的误差校正效果,能够比较准确的估计出波达方向角和幅相误差值。

In order to solve problem caused by disturbance of amplitude and phase errors in practical application, by combining with direction of arrival （DOA） estimation algorithm of the subspace class, an amplitude and phase errors calibration algorithm based on uniform circular array is proposed. Firstly amplitude and phase errors are pre- liminarily estimated according to the structural features of covariance matrix of the uniform circular array; secondly more accurate estimation is obtained through iterative method. The auto-calibration method is easy for implementa- tion and not need initialization parameters. Simulation results verified that, by using this algorithm, good error cali- bration effect can be achieved, and angle of DOA and amplitude and phase error value can be estimated accurately.