基于协方差矩阵重构的稳健宽线性波束形成算法  

A Robust Widely Linear Beamforming Algorithm Based on Covariance Matrix Reconstruction

作　　者：刘江波 沈仁强 谭世川 LIU Jiangbo;SHEN Renqiang;TAN Shichuan(Science and Technology on Electronic Information Control Laboratory,Chengdu 610036,China)

机构地区：[1]电子信息控制重点实验室,成都610036

出　　处：《电子信息对抗技术》2021年第3期39-44,共6页Electronic Information Warfare Technology

摘　　要：对于非圆信号,现有的宽线性波束形成算法要么计算复杂度太高,要么在高信噪比的条件下性能恶化。为了解决该问题,提出一种新的稳健宽线性波束形成算法。首先,给出计算非圆系数空间谱的新方法;然后,通过非圆系数空间谱和Capon空间谱来重构扩展的干扰加噪声协方差矩阵,以达到剔除样本协方差矩阵中期望信号成份的目的。接着,利用迭代稳健Capon波束形成技术估计期望信号的扩展导向矢量。所提算法仅需期望信号所在角度区域和天线阵列结构这两个先验知识。最后,仿真实验结果表明所提算法比现有算法的性能更优。For non-circular signals,the existing widely linear beamformers either have high com-putational complexities or suffer from performance degradation at high signal-to-noise ratio.In order to cope with this problem,a new robust widely linear beamforming algorithm is proposed.A new method to calculate the spatial spectrum of the non-circularity coefficient is firstly devel-oped.Then,the augmented interference-plus-noise covariance matrix is reconstructed by using the Capon spatial spectrum and the non-circularity coefficient’s spatial spectrum.Subsequently,iterative robust Capon beamforming technique is adopted to estimate the desired signal’s extend steering vector.Only the prior knowledge of the antenna array geometry and the angular sector in which the desired signal is located are utilized in the proposed approach.Compared with the ex-isting representative widely linear beamforming methods,numerical simulations are provided to confirm that the proposed algorithm can achieve a better performance.

关 键 词：非圆信号 宽线性波束形成 协方差矩阵重构 导向矢量估计 

分 类 号：TN911.72[电子电信—通信与信息系统]