基于相位编码波形捷变和CFAR技术的抗同频干扰  

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

作　　者：夏栋 张凯旋 丁友宝 李宝鹏 XIA Dong;ZHANG Kaixuan;DING Youbao;LI Baopeng(Qingdao Campus, Naval Aviation University, Qingdao 266041, China)

机构地区：[1]海军航空大学青岛校区,山东青岛266041

出　　处：《系统工程与电子技术》2022年第4期1210-1219,共10页Systems Engineering and Electronics

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。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.

关 键 词：同频干扰 相位编码 恒虚警 波形设计 

分 类 号：TN973[电子电信—信号与信息处理]