一种基于协方差矩阵锥化的多维域干扰抑制方法  

A Multi-dimensional Jamming Suppression Method Based on Covariance Matrix Taper

作　　者：蔡霖培 解晋 CAI Linpei;XIE Jin(The 54th Research Institute of CETC,Shijiazhuang 050081,China;Unit 61711 of PLA,Kashgar 844000,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]解放军61711部队,新疆喀什844000

出　　处：《舰船电子对抗》2024年第6期27-32,共6页Shipboard Electronic Countermeasure

摘　　要：当干扰机相对雷达阵列天线高速移动时,干扰呈现非平稳特性,使用传统抗干扰算法对其抑制会出现零陷与干扰失配现象,进而导致抗干扰失效。针对此问题,提出一种基于协方差矩阵锥化(CMT)的多维域干扰抑制方法,能在极化、空、时多维域实现精确的信干分离。首先,通过在极化、空间多维域添加服从Laplace分布的虚拟干扰簇来模拟动态干扰波达方向(DOA)扰动的变化。然后,构造锥化矩阵并对原始协方差矩阵锥化,进而结合最小方差无失真响应(MVDR)波束形成器实现零陷展宽。模拟实验从抗干扰零陷、输出性能、匹配滤波结果3方面验证了所提方法在干扰DOA扰动下的可行性。此外,所提方法对来自主瓣的干扰同样能够有效抑制。When the jammer moves at a high speed relative to the radar array antenna,the interference exhibits non-stationary characteristics.If traditional anti-jamming algorithms are used to suppress the jamming,zero traps and jamming mismatch will occur,which will lead to the failure of anti-jamming.To solve this problem,a multi-dimensional jamming suppression method based on covariance matrix taper(CMT)is proposed,which can achieve accurate signal interference separation in multi-dimension of polarization,space and time.Firstly,by adding virtual interference clusters that follow the Laplace distribution in the dimensions of polarization and spatial,the changes in the direction of arrival(DOA)disturbance of dynamic interference waves are simulated.Then,this paper constructs a tapering matrix and tapers the original covariance matrix,and combines it with the minimum variance distortionless response(MVDR)beamformer to achieve zero trap broadening.The simulation experiment verifies the feasibility of the proposed method under jamming DOA disturbance from three aspects:anti-jamming zero traps,output performance,matched filtering results.In addition,the proposed method can also effectively suppress the jamming from the main lobe.

关 键 词：非平稳性 抗干扰 多维域干扰 零陷展宽 

分 类 号：TN973[电子电信—信号与信息处理]