非合作连续波雷达中存在强直达波和多径杂波的运动目标检测方法

研究了利用非合作商用调频照射信号的收发分置连续波无源雷达系统运动目标的检测技术.针对该系统中强直达波及多径杂波对动目标检测的干扰,提出了一种直达波和多径到达时间为整数采样迟延的杂波抑制方法和利用分数内插提高杂波对消性能的算法.在杂波对消的基础上,通过对回波信号作长时间相干匹配滤波实现对微弱运动目标的检测.基于实测数据及实时系统的处理结果验证了方法的有效性.

Detection of Moving Targets in Commercial Illuminator Based Radar System with Strong Direct Signal and Multipath Clutters Presented

Clutter cancellation algorithm for passive coherent detection of weak moving tar gets in a non-cooperative bistatic radar system using commercial FM illuminatin g is provided.The algorithm presented a method for canceling clutter with arriva l time located exactly at integral sampled intervals,and a method exploiting fra ctional delay interpolation for better rejection of the interference from strong direct signal and multipath reflected clutters.After direct signal and multipat h clutter cancellation,the moving targets can be easily detected and tracked usi ng cascade long-term coherent match filtering of received sign al.The efficacy of the method is demonstrated by offline processing real collect ed data sets as well as real-time processing via a mobile experimental system.