一种基于时域差分的穿墙雷达BP成像算法  

A Back-projection Algorithm to Through-the-Wall Radar Imaging Based on Time-domain Difference

作　　者：王涵宁[1] 陆必应[1] 周智敏[1] 宋千[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《现代雷达》2012年第1期44-48,共5页Modern Radar

摘　　要：利用步进频连续波雷达对墙后运动的人体目标进行探测,对墙体杂波抑制和人体目标成像展开了研究。首先,利用人体目标慢速运动的特征,采用时域差分的方法抑制墙体杂波,使人体目标回波得以凸显;然后,分析了墙体折射对目标回波时延的影响,在此基础上对传统的后向投影成像算法进行了改进,使其适用于墙后区域的目标成像;最后,对该算法进行了推广,在一定程度上实现了对人体目标的跟踪。实测数据的处理结果表明,该算法能够在系统离墙12.6 m的情况下有效地消除墙体回波的影响,清晰地显现出在墙后运动的人体目标。A stepped-frequency-continuous-wave （SFCW） radar is applied to through-the-wall （TTW） detection in this paper. Based on the field data, the wall-clutter suppression and interior target imaging are analyzed. First, the wall-clutter suppression al- gorithm based on time-domain difference is proposed by using the characteristic of slow-moving target, and the target-echo is there- fore emerged. According to the influence of wall refraction on target-echo＇s time delay, the traditional back-projection （BP） algo-rithm is modified for TTW imaging. Finally, the algorithm is generalized for target tracking. Experimental results show that, this algorithm is able to suppress wall-clutter and image the human target moving behind the wall effectively when the radar system is 12.6 m away from the wall.

关 键 词：进频连续波雷达 穿墙探测 时域差分 

分 类 号：TN957.52[电子电信—信号与信息处理]