强杂波背景下穿墙成像雷达多径虚像抑制  

Multipath Virtual Image Suppression of Through-the-Wall Imaging Radar Under Strong Clutter Background

作　　者：李家强[1,2] 陈德昌 陈金立[1,2] 朱艳萍[1] LI Jiaqiang;CHEN Dechang;CHEN Jinli;ZHU Yanping(School of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044 [2]南京信息工程大学气象灾害预报预警与评估协同创新中心,江苏南京210044

出　　处：《雷达科学与技术》2020年第2期145-150,155,共7页Radar Science and Technology

基　　金：国家自然科学基金(No.61801231)。

摘　　要：在穿墙雷达成像中,侧墙与目标、后墙之间反射产生的多径虚像与杂波严重干扰了目标检测成像。本文首先建立了此类虚像和杂波形成的场景模型,并构建目标和墙体之间的多径传播模型,以此为基础给出选取子孔径的基本准则。然后基于子孔径图像相乘的原理,提出伽马校正的方法,即根据图像对比度的比例关系获得每个子图像指数权值并将加权的子图像进行连乘,从而达到抑制多径虚像与强杂波的效果。最后给出实验仿真和相应的分析,目标信杂比有了明显提高。In through-the-wall radar imaging,the multipath virtual image and clutter can be generated due to the reflection between the side wall,the target and the back wall,which seriously interferes with the target detection and imaging.In this paper,we firstly establish the scene model of such virtual image and clutter and construct the multipath propagation model between the target and the wall.On the basis,we give the basic criteria of selecting sub-apertures.Then,a gamma correction method is proposed based on the principle of sub-apertures image multiplication.That is,each sub-image index weight is obtained according to the proportional relationship of image contrast and the weighted sub-images are multiplied,which achieves the effect of suppressing multipath virtual images and strong clutter.Finally,experimental simulation and corresponding analysis are given,and the target-to-clutter ratio is significantly improved.

关 键 词：穿墙雷达 多径虚像 子孔径 伽马校正 

分 类 号：TN957.51[电子电信—信号与信息处理]