线性调频信号变波形抗同频干扰研究  

Research on Anti-co-frequency Interference of LFM Signal Variable Waveform

作　　者：夏栋 朱海华 张静[2] XIA Dong;ZHU Hai-hua;ZHANG Jing(Qingdao Campus,Naval Aviation University,Qingdao 266041,China;Unit 91033 of PLA,Qingdao 266000,China)

机构地区：[1]海军航空大学青岛校区,山东青岛266041 [2]中国人民解放军91033部队,山东青岛266000

出　　处：《中国电子科学研究院学报》2020年第7期642-648,684,共8页Journal of China Academy of Electronics and Information Technology

摘　　要：同频干扰会严重影响雷达对目标的探测性能。为了消除同频干扰的对雷达的影响,研究了线性调频信号变波形抗同频干扰问题,介绍了同频干扰机理及危害,针对线性调频信号进行了信号通过匹配滤波器仿真,建立信号与滤波器失匹配模型,对信号与滤波器失匹配的结果进行分析,并将失匹配信号进行恒虚警检测,对恒虚警检测输出结果进行分析,得出线性调频信号变波形抗同频干扰的结果。最终仿真结果表明,线性调频信号在适当的变化波形下,可以有较好的抗同频干扰效果。Co-frequency interference will seriously affect radar detection performance to target.In order to eliminate impact of co-frequency interference on radar,the problem of anti-co-frequency interference of the chirp signal variable waveform is studied,and the co-frequency interference mechanism and harm are introduced.For the chirp signal,the signal is simulated by the matched filter to establish the signal and filter mismatch model,and mismatch results between signal and filter are analyzed,and then a constant false alarm detection is performed on the mismatched signal,which analyzes the output of the constant false alarm detection to obtain the linear frequency modulation signal variable waveform to resist the same frequency interference result.Final simulation results show that the chirp signal can have a better anti-interference effect under the appropriate changing waveform.

关 键 词：线性调频 同频干扰 脉冲压缩 匹配滤波 

分 类 号：TN973.3[电子电信—信号与信息处理]