基于干扰不确定集重构的相干稳健自适应波束形成方法  

Robust adaptive beamforming for coherent interferences based on uncertainty⁃set reconstruction

作　　者：陈鹏[1] 王威 杨益新[2] 马远良[2] Chen Peng;Wang wei;Yang Yixin;Ma yuanliang(School of Information Engineering,Chang'an University,Xi'an,710064,China;School of Marine Science and Technology,Northwestern Polytechnical University,Xi'an,710072,China)

机构地区：[1]长安大学信息工程学院,西安710064 [2]西北工业大学航海学院,西安710072

出　　处：《南京大学学报（自然科学版）》2021年第5期857-863,共7页Journal of Nanjing University（Natural Science）

基　　金：中国博士后科学基金(2019M660049XB);国家自然科学基金(61871059,61901057);长安大学中央高校基本科研业务费专项资金(300102240302)。

摘　　要：近年来,基于协方差矩阵重构的自适应波束形成技术一定程度上避免了期望信号出现“自消”的现象,然而当相干干扰与导向矢量误差同时存在时,现有的重构类波束形成器对干扰的抑制能力较差.针对该问题,提出一种基于干扰不确定集的空域扇区重构自适应波束形成算法,该算法适用于任意阵型.首先使用迭代自适应估计的方法拟合解相干的样本协方差矩阵,再使用传统的空域扇区重构方式,将估计的空间谱在干扰导向矢量不确定集上进行积分,重构干扰加噪声协方差矩阵,最后通过同样的方式重构期望信号协方差矩阵,并将其最大特征值对应的特征向量作为期望信号导向矢量的估计.数值仿真与实验结果表明,所提算法可以在存在导向矢量误差时有效地抑制相干干扰.The recently developed adaptive beamforming based on covariance matrix reconstruction technique can avoid the phenomenon of desired signal“self cancellation”to some extent.However,when steering vector(SV)mismatches and coherent signals both exist,the interference suppression capability of existing reconstruction⁃based beamformers may be severely degraded.To takle this issue,a spatial sector⁃reconstruction⁃based adaptive beamforming algorithm using interference uncertainty set is presented in this paper,and this algorithm is effective for all types of array geometry.Firstly,this beamforming algorithm obtains a de⁃correlated Sample Covariance Matrix(SCM)using the iteratively adaptive esitimation algorithm.By using the traditional spatial⁃sector⁃reconstruction method,the proposed algorithm reconstructs the Interference⁃plus⁃Noise Covariance Matrix(INCM)by integrating Capon spatial spectrum over the interference SV uncertainty set.Finally,the Desired Signal Covariance Matrix(DSCM)is reconstructed in a similar manner of INCM reconstruction,and the SV of the desired signal is estimated as the eigenvector corresponding to the largest eigenvalue of the DSCM.Numerical simulations and experimental results show that the proposed algorithm can effectively suppress coherent interferences in the presence of SV error.

关 键 词：自适应波束形成 导向矢量误差 相干干扰 不确定集重构 

分 类 号：TB56[交通运输工程—水声工程]