基于空时滤波的多通道SAR抗欺骗干扰算法  

A Deception Jamming Detection and Suppression Method for Multichannel SAR Based on Space⁃Time Filtering

作　　者：王跃飞 董祺 毛新华[1] WANG Yuefei;DONG Qi;MAO Xinhua(Key Laboratory of Radar Imaging and Microwave Photonics,Ministry of Education,Nanjing University of Aeronautics and Astronau-tics,Nanjing 211106,China;Beijing Institute of Control and Electronics Technology,Beijing 100049,China)

机构地区：[1]南京航空航天大学雷达成像与微波光子技术教育部重点实验室,江苏南京211106 [2]北京控制与电子技术研究所,北京100049

出　　处：《雷达科学与技术》2023年第2期165-174,共10页Radar Science and Technology

基　　金：国家自然科学基金(No.62071225)。

摘　　要：干扰机通过“截获⁃调制⁃转发”的方式对雷达实施欺骗干扰,导致成像图中形成难以分辨的假目标,严重影响目标识别。针对直达波欺骗干扰难分辨和去除的问题,本文基于多通道合成孔径雷达(Synthetic Aperture Radar,SAR)信号与干扰模型,提出了一种SAR欺骗干扰的检测与抑制方法。首先通过分置相位中心天线(Displaced Phase Center Antenna,DPCA)方法对消静止场景目标,分离出干扰信号;然后采用沿航迹干涉(Along⁃Track Interferometry,ATI)方法估计出干扰信号的空间位置;利用获取的干扰信号先验信息,基于干扰信号与目标信号在空时二维分布差异,采用基于零点约束的最小二乘误差方向图合成的空域滤波方法联合多普勒滤波抑制干扰。仿真实验表明,本文方法能有效检测和抑制欺骗干扰,同时不损失真实场景信息。The jammer implements deceptive jamming on the radar by means of“interception⁃modulation⁃forward⁃ing”,resulting in the false targets which are difficult to distinguish in the imaging.Aiming at the issue of detection and suppression of the direct⁃wave deceptive jamming modulated and forwarded by the jammer,an anti⁃jamming approach discriminating and suppressing false targets is proposed in this paper,which is based on the model of jamming and tar⁃get signal of synthetic aperture radar(SAR).This approach utilizes displaced phase⁃center antenna(DPCA)process⁃ing to make the stationary target signal disappear and display the false targets,then adopts the along⁃track interferometry(ATI)method to estimate the direction of the jammer.In addition,the least square error pattern synthesis with nulls is also introduced to suppress deceptive jamming in Doppler and spatial domain based on the obtained prior information of jamming signal.Finally,the simulation results demonstrate the correctness of the proposed deceptive jamming estima⁃tion and suppression algorithm.

关 键 词：合成孔径雷达 直达波欺骗干扰 分置相位中心 干涉处理 空时滤波 

分 类 号：TN957.5[电子电信—信号与信息处理]