基于均匀十字阵的幅相误差自校正算法

摘要

针对实际应用中普遍存在的幅相误差扰动问题，结合子空间类波达方向估计算法，基于均匀十字阵列，提出了一种幅相误差的自校正算法。均匀十字阵列可分解为两个相互垂直的均匀线性阵列，利用均匀线阵接收数据协方差矩阵的结构特点对幅相误差进行初步估计，计算出波达方向的初始估计值，通过迭代方法得到更精确的估计值，自校正方法不需要任何参数初始值，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，能够比较准确地估计出信源的波达方向角和阵元的幅相误差值。%Aimed at the widespread disturbance problem of amplitude and phase errors in practical application, combined with DOA estimation algorithm of the subspace class and based on a uniform cross array, a kind of algorithm to correct amplitude and phase errors is proposed. Uniform cross array can decompose into two uniform linear arrays which are mutually perpendicular. Amplitude and phase errors are preliminarily estimated according to the structural features of the uniform circular array covari-ance matrix, and the DOA also is calculated; the more accurate estimation is obtained through the iterative method. Relatively, the self-correction method is easy to achieve in that it requires no initial parameters. The simulation results manifest that the algorithm assumes good effects on error correction and is able to accurately estimate the azimuth and the amplitude and phase error value.