基于特征投影矩阵和线性约束的水声阵列信号抗主瓣干扰方法  

Mainlobe Interference Suppression Method for Underwater Acoustic Array Signal Based on Eigen Projection Matrix and Linear Constraint

作　　者：王凯玥 王景景[1] 闻卫军[1] WANG Kaiyue;WANG Jingjing;WEN Weijun(College of Information Science and Technology,Qingdao University of Science and Technology,Qingdao 266061,China)

机构地区：[1]青岛科技大学信息科学技术学院,山东青岛266061

出　　处：《青岛科技大学学报（自然科学版）》2024年第1期138-145,共8页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金项目(U1806201).

摘　　要：提出了基于特征投影矩阵和线性约束的水声阵列信号抗主瓣干扰方法。该方法首先改进重构了干扰噪声的协方差矩阵,消除预处理时期望信号对主瓣干扰特征矢量选择的影响;其次,添加线性约束,保证期望信号方向增益,约束旁瓣干扰子空间置零,同时使得自适应权矢量的模最小,消除噪声抖动;最后求取自适应权矢量进行波束形成。仿真实验结果表明,本工作算法不仅在旁瓣有更深零陷,还能使主波束保形,提高了系统的输出信干噪比。Beamforming is a key technology for underwater acoustic array signal processing.Adaptive beamforming can effectively suppress sidelobe interference and improve the signalto-noise ratio of received signals.However,interference from the main lobe region of underwater acoustic array will lead to the formation of zero trap in the main lobe of conventional adaptive beamforming,which will distort the primary beam and raise the sidelobe level,affecting the communication performance.In particular,when the expected signals are mixed into the sampled data and the interference intensity of the main lobe is large,problems such as peak offset and sidelobe zero-notch disappearance will occur.In this paper,an anti-main lobe interference method based on eigenprojection matrix and linear constraint is proposed for underwater acoustic array signal.Firstly,the covariance matrix of the interference noise is improved and reconstructed to eliminate the influence of the expected signal on the selec tion of the main lobe interference feature vector.Secondly,linear constraints were added to ensure the desired signal directional gain,constrain the sidelobe interference subspace zeroing,minimize the modulus of adaptive weight vector,and eliminate noise jitter.Finally,the adaptive weight vector is obtained for beamforming.The simulation results show that the proposed algorithm not only has deeper zero hole in the sidelobe,but also can keep the main beam conformal and improve the signal to noise ratio of the system.

关 键 词：主瓣干扰 特征投影矩阵 自适应波束形成 线性约束 

分 类 号：TN929.3[电子电信—通信与信息系统]