系统工程与电子技术 ›› 2022, Vol. 44 ›› Issue (4): 1210-1219.doi: 10.12305/j.issn.1001-506X.2022.04.18

• 传感器与信号处理 • 上一篇    下一篇

基于相位编码波形捷变和CFAR技术的抗同频干扰

夏栋, 张凯旋*, 丁友宝, 李宝鹏   

  1. 海军航空大学青岛校区, 山东 青岛 266041
  • 收稿日期:2021-01-04 出版日期:2022-04-01 发布日期:2022-04-01
  • 通讯作者: 张凯旋
  • 作者简介:夏栋(1983—), 男, 讲师, 博士, 主要研究方向为机载雷达信号处理|张凯旋(1993—), 男, 讲师, 硕士, 主要研究方向为雷达抗干扰技术|丁友宝(1972—), 男, 副教授, 硕士, 主要研究方向为预警探测技术|李宝鹏(1986—), 男, 讲师, 硕士, 主要研究方向为雷达信号处理

Co-channel interference resistance based on agile wave form of phase encode and CFAR technology

Dong XIA, Kaixuan ZHANG*, Youbao DING, Baopeng LI   

  1. Qingdao Campus, Naval Aviation University, Qingdao 266041, China
  • Received:2021-01-04 Online:2022-04-01 Published:2022-04-01
  • Contact: Kaixuan ZHANG

摘要:

同频干扰具有压制干扰和欺骗干扰的特点, 是一种较难对抗的雷达干扰方式, 而灵活的波形设计是抗同频干扰的一种新途径。本文对同频干扰的机理和信号特性进行了分析和总结, 而后研究了两级相位编码信号变波形脉压失配后输出信号的特点。在此基础上提出了利用相位编码变波形联合恒虚警(constant false-alarm rate, CFAR)技术抗同频干扰的方法, 通过合理设置相位编码波形和匹配压缩滤波器, 使同频干扰信号处于脉压失配状态, 再通过CFAR处理滤除干扰信号。仿真结果表明, 合理设置相位编码波形并配合CFAR检测处理, 能够有效地从同频干扰中提取出有用的目标回波信号, 并且对强同频干扰具有较好的适应性。

关键词: 同频干扰, 相位编码, 恒虚警, 波形设计

Abstract:

Co-channel interference has the characteristics of suppressing interference and deceiving interference, which is an interference difficult to resist. Waveform design is a new way to resist co-channel interference. This paper analyzes and summarizes the mechanism and signal characteristics of the same frequency interference, and studies the characteristics of the output signal after the two-stage phase encoding variable waveform pulse compressing mismatch. On this base, a method of using phase encoding variable waveform combined with constant false-alarm rate (CFAR) to resist the co-channel interference is proposed. By setting the phase encoding waveform and matching compression filter reasonably, the interference is in a state of mismatch, and then the interference is filtered through the CFAR. The simulation results show that the two-stage phase encoding has a reasonable setting of waveform and cooperating with CFAR detection processing, which can effectively extract the useful target echo signal from the interference, and is excellent in applicability to strong co-channel interference.

Key words: co-channel interference, phase encode, constant false-alarm rate (CFAR), wave form design

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