基于时-空-时级联的DTTB无源雷达非平稳杂波及同频干扰抑制方法  

Suppression Methods of Non-stationary Clutter and Co-channel Interference for DTTB Passive Radar Based on Time-space-time Cascade

作　　者：赵国华 薛阳 蔡武 朱玉权 ZHAO Guo-hua;XUE Yang;CAI Wu;ZHU Yu-quan(Naval Radar and Sonar Repairing Factory,Qingdao 266100,China;The 8th Research Academy of CSSC,Yangzhou 225101,China)

机构地区：[1]海军青岛雷达声纳修理厂,山东青岛266100 [2]中国船舶集团有限公司第八研究院,江苏扬州225101

出　　处：《舰船电子对抗》2023年第3期42-47,共6页Shipboard Electronic Countermeasure

摘　　要：在无源雷达系统中,特别是地面数字电视广播(DTTB)雷达中,监测信号不仅包含直达波和多径杂波,同时还存在来自其它同频基站的直达波和多径干扰信号。当实际探测环境非平稳和干扰样本无法获取时,常规时域滤波方法无法有效抑制杂波及同频干扰。针对该问题,提出一种基于时-空-时级联的DTTB无源雷达非平稳杂波及同频干扰抑制方法。首先利用递归最小二乘方法(RLS)去除主基站的直达波和多径杂波;然后利用低副瓣自适应波束形成方法获取干扰样本,从而实现非平稳同频干扰的抑制;最后,理论分析与仿真实验验证了该方法对于干扰的抑制性能。In passive radar systems,especially in the digital television terrestrial broadcasting(DTTB)radar,the surveillance signals not only include direct waves and multipath clutters,but also include the direct waves and multipath interference signals from other base stations with the same frequency.When the actual detection environment is non-stationary and the interference sample can't be obtained,conventional time-domain filtering methods can't effectively suppress the clutters and co-channel interference.Aiming at this problem,a method of non-stationary clutters and co-channel interference suppression for DTTB passive radar based on time-space-time cascade is proposed.Firstly,the recursive least squares(RLS)method is used to remove the direct waves and multipath clutters of the main base station;then the interference samples is obtained by the low sidelobe adaptive beamforming method,and thus the suppression of non-stationary co-channel interference is realized;finally,the interference suppression performance of the proposed method is verified through theoretical analysis and simulation experiments.

关 键 词：无源雷达 非平稳杂波 地面数字电视广播 递归最小二乘方法 

分 类 号：TN971.1[电子电信—信号与信息处理]