穿墙雷达中多目标的幅度修正BP算法  

Amplitude-modified BP Imaging Algorithm of Multiple Objects for UWB Through-wall Radar

作　　者：张华美[1] 

机构地区：[1]南京邮电大学电子科学与工程学院,南京210003

出　　处：《信息化研究》2015年第3期28-31,共4页INFORMATIZATION RESEARCH

摘　　要：穿墙成像中,超宽带雷达利用后向投影(BP)算法对多目标进行检测时,由于电磁波传播的衰减效应,易发生漏检现象。为了降低漏检率,本文分析了电磁波信号穿墙时的传播损耗、墙体对折射波的吸收作用及球面波本身的衰减效应,在BP成像算法中对这三种损耗引起的衰减分别进行幅度补偿,补偿结果令人满意。本文比较了三种补偿的效果差异,并考虑了单层墙体和两层墙体两种情况。时域有限差分(FDTD)法的仿真结果表明,幅度补偿对多目标的成像起到了积极作用。When the ultra-wideband radar detects multiple targets using back-projection(BP)algorithm in through-wall imaging,because of attenuation effect induced by transmission of the electromagnetic waves,non detectable phenomena is often occurred.To reduce the undetected rate,the electromagnetic wave's transmission loss,the wall's absorbing effect to the refection wave and the spherical wave's loss itself are analyzed.According to three losses the amplitude compensation is educed in BP algorithm,the effect is satisfactory.The difference on effect is compared,and a single wall and the double walls are both considered.The simulation results by the finite difference time domain method show that the amplitude compensation plays a positive role on the multiple targets imaging.

关 键 词：穿墙成像 幅度补偿 后向投影算法 时域有限差分 

分 类 号：TN958[电子电信—信号与信息处理]