基于多普勒扩展补偿的FDA-MIMO雷达运动目标检测  

FDA-MIMO Radar Moving Target Detection Based on Doppler Spread Compensation

作　　者：张顺生[1] 刘美慧 王文钦 ZHANG Shunsheng;LIU Meihui;WANG Wenqin(Research Institute of Electronic Science and Technology,University of Science and Technology of China,Chengdu 611731,China;School of Information and Communication Engineering,University of Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学电子科学技术研究院,成都611731 [2]电子科技大学信息与通信工程学院,成都611731

出　　处：《雷达学报（中英文）》2022年第4期666-675,共10页Journal of Radars

基　　金：国家自然科学基金(62171092)。

摘　　要：频控阵-多输入多输出(FDA-MIMO)雷达在检测运动目标时,由于发射阵元间的频率偏移与目标的速度耦合,因此在慢时间维出现严重的多普勒扩展,进一步造成各接收通道的信号能量无法相干累积,极大降低了系统的检测性能。针对此问题,该文提出一种基于多普勒扩展补偿的FDA-MIMO雷达运动目标检测算法。首先建立了FDA-MIMO雷达运动目标的回波模型,分析了频偏带来的多普勒扩展问题;然后在给出最大似然接收机模型的基础上,提出一种基于插值滤波的重采样算法来补偿FDA-MIMO雷达在检测运动目标时引起的多普勒扩展。仿真结果表明:该文所提算法在抑制多普勒扩展的同时,能够补偿子目标回波在距离维的跨单元走动,实现信号能量的相参累积。When Frequency Diverse Array and Multiple-Input Multiple-Output(FDA-MIMO)radar detects moving targets,the frequency offset between transmitting arrays is coupled with the target velocity,resulting in severe Doppler spread in the slow time dimension.Further,the signal energy of each receiving channel cannot be coherently accumulated,thereby greatly reducing the detection performance of the system.To address this problem,a method of FDA-MIMO radar moving target detection based on Doppler spread compensation is proposed.Firstly,the moving target echo model of FDA-MIMO radar is established,and the Doppler spread caused by the frequency offset is analyzed.After establishing the maximum likelihood receiver model,a resampling method based on an interpolation filter is proposed to compensate for the Doppler spread caused by FDA-MIMO radar during the detection of moving targets.Simulation results reveal that the proposed method can suppress the Doppler spread,compensate for the cross-cell migration of subtarget echo in the range dimension,and realize the coherent accumulation of signal energy.

关 键 词：FDA-MIMO雷达 运动目标检测 重采样 插值滤波 多普勒扩展 

分 类 号：TN958[电子电信—信号与信息处理]