基于复迭代滤波的连续波调频雷达同频非相参调频干扰抑制方法  

Interference Suppression Approach for FMCW Radar Based on Complex Iterative Filtering

作　　者：陈齐乐 杨瑾[1] 乔彩霞 张睿恒 CHEN Qile;YANG Jin;QAO Caixia;ZHANG Ruiheng(Science and Technology on Electromechanical Dynamic Control Laboratory,Beijing Institute of Technology,Beijing 100081,China;Beijing Remote Sensing Equipment Research Institute,Beijing 100143,China;Beijing Institute of Radio Metrology and Testing,Beijing 100081,China)

机构地区：[1]北京理工大学机电动态控制重点实验室,北京100081 [2]北遥感设备研究所,北京100143 [3]北京无线电计量测试研究所,北京100081

出　　处：《兵工学报》2024年第12期4589-4596,共8页Acta Armamentarii

基　　金：科技创新2030“脑科学与类脑研究”重大项目(2022ZD0209600);国家自然科学基金项目(62201058);中国博士后科学基金项目(2021M700399)。

摘　　要：针对连续波调频(Frequency Modulation Continuous Wave,FMCW)雷达易被同频非相参调频信号干扰的问题,设计基于复迭代滤波(Complex Iterative Filtering,CIF)的干扰抑制方法。根据FMCW雷达目标回波差频信号为多个单音信号叠加以及干扰差频信号为覆盖雷达通带的调频信号的特点,采用所提的CIF方法将FMCW雷达输出差频信号分解在本征模态函数(Intrinsic Mode Function,IMF)域,并通过各IMF恒虚警检测获得干扰信号能量分布位置,设计干扰能量剔除及目标回波差频信号幅相重构方法实现干扰抑制。通过仿真和实测数据验证了抗干扰方法的有效性。实验结果表明,在低于-20 dB信干噪比条件下,所提方法能够有效抑制同频非相参调频信号的干扰。An interference suppression approach based on complex iterative filtering(CIF)is designed to address the issue of frequency modulation continuous wave(FMCW)radar being susceptible to FM interference which has the same bandwidth with the radar.Based on the fact that the beat signal of target echo is a superposition of multiple single tone signal but the beat signal of interference is an FM signal covering the bandwidth of radar receiver,the CIF algorithm proposed in this paper is used to decompose the beat signal of radar into the intrinsic mode functions(IMFs)domain,and the energy distribution position of interference signal is obtained by the constant false alarm detection of each IMF.Furthermore,a method for eliminating the interference energy and reconstructing the amplitude and phase of target echo is designed.The proposed interference suppression approach is verified by the simulation and measured data.The results show that the proposed approach has a suppression effect of the signals with co-frequency and noncoherent frequency modulation at signal-to-interference-plus-noise-ratio of less than 20 dB.

关 键 词：连续波调频 同频干扰 干扰抑制 复迭代滤波 本征模态函数 

分 类 号：TN957.51[电子电信—信号与信息处理]