基于干扰加噪声协方差矩阵重建的稳健自适应波束形成算法研究  

Research on robust adaptive beamforming algorithm based on interference⁃plus⁃noise covariance matrix reconstruction

作　　者：桂子杭 黎杨 李琼[1] GUI Zihang;LI Yang;LI Qiong(School of Electrical and Information Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]武汉工程大学电气信息学院,湖北武汉430205

出　　处：《现代电子技术》2022年第23期71-75,共5页Modern Electronics Technique

摘　　要：针对自适应波束形成中的期望信号“自消”问题,就近年来提出的期望信号预减除类方法展开研究。该类方法首先使用波达方向(DOA)估计技术得到期望信号的波达方向;然后从协方差矩阵中估计干扰加噪声协方差矩阵,来消除采样信号期望信号分量对算法的影响,避免产生期望信号“自消”问题,进一步修正假定的期望信号导向矢量来估计真实导向矢量;最后计算得到权矢量。理论分析给出了4种代表性方法的原理和算法的复杂度,并通过数值仿真验证,仿真结果表明,当存在阵列扰动的情况下,协方差适配重建方法在低信噪比(SNR)下获得更佳的性能。当存在指向误差的情况下,子空间重建方法在很大的输入信噪比范围内受的影响最小。文中总结了这些方法的综合性能优缺点,对于该类方法实际应用有一定指导意义。The desired signal pre⁃abatement methods proposed in recent years have been studied in allusion to the desired signal self⁃nulling in adaptive beamforming.In this kind of methods,the direction of arrival(DOA)estimation technique is used to obtain the DOA of the desired signal,and then the interference⁃plus⁃noise covariance matrix(INCM)is estimated in the covariance matrix to eliminate the influence of the desired signal component of the sampling signal on the algorithm,avoid the generation of the desired signal self⁃nulling,further modify the steering vector of the assumed desired signal to estimate the real steering vector,and the weight vector is obtained by calculation finally.The principles of four representative methods and the complexity of the algorithm are given in the theoretical analysis.In addition,numerical simulation was conducted.The simulation results show that,in the presence of array perturbation,the covariance adaptive reconstruction method presents better performance in low signal⁃to⁃noise ratio(SNR);in the presence of pointing errors,the subspace reconstruction method is affected minimally over a wide range of input SNR.The advantages and disadvantages of comprehensive performance of these methods are summarized,which has certain guiding significance for the practical application of such methods.

关 键 词：自适应波束形成 信干噪比 均匀直线阵列 干扰加噪声协方差矩阵 导向矢量 空间谱 Capon波束形成 

分 类 号：TN911.7-34[电子电信—通信与信息系统]