基于特征值斜投影的主瓣干扰抑制方法  

Main Lobe Interference Suppression Method Based on Eigenvalue Oblique Projection

作　　者：孟昊宇 杨小鹏[1,2] 高升 于智超 MENG Haoyu;YANG Xiaopeng;GAO Sheng;YU Zhichao(Radar Research Lab,School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401120,China)

机构地区：[1]北京理工大学信息与电子学院雷达技术研究所,北京100081 [2]北京理工大学重庆创新中心,重庆401120

出　　处：《信号处理》2022年第2期439-444,共6页Journal of Signal Processing

基　　金：国家自然基金项目(61860206012);重庆市自然基金项目(cstc2020jcyj-msxmX0768)。

摘　　要：主瓣干扰将导致传统自适应波束形成算法的主瓣畸变、峰值偏移、旁瓣电平抬升,致使相控阵系统抗干扰性能严重恶化。另外,当接收快拍中存在目标信号时,会导致自适应波束形成在目标信号方向生成零陷,降低接收目标信号增益。针对这些问题,本文提出一种基于特征值斜投影的主瓣干扰抑制方法。首先通过构建特征值斜投影预处理矩阵滤除主瓣干扰,然后通过对角加载降低协方差矩阵失配的影响。所提算法能有效抑制主瓣干扰和接收信号中目标信号的影响。仿真验证了所提算法主瓣干扰抑制的有效性和鲁棒性。The main lobe interference will cause the main lobe distortion,peak offset and sidelobe level rise of the traditional adaptive beamforming algorithm,which will seriously deteriorate the anti-jamming performance of phased array system.In addition,when there is a desired signal in the received snapshot,adaptive beamforming will generate a null in the direction of the desired signal and reduce the gain of the received desired signal.To solve these problems,a main lobe interference suppression method based on eigenvalue oblique projection is proposed in this paper.Firstly,the eigenvalue oblique projection preprocessing matrix was constructed to filter the main lobe interference,then the influence of covariance matrix mismatch was reduced by diagonal loading.The proposed algorithm can effectively suppress the main lobe interference and the influence of the desired signal in the received signal.Simulation results demonstrate the effectiveness and robustness of the proposed algorithm for main lobe interference suppression.

关 键 词：主瓣干扰抑制 自适应波束形成 特征值斜投影 

分 类 号：TN958.92[电子电信—信号与信息处理]