南京大学学报（自然科学版）2016，Vol.52Issue(6)：1146-1153,8.DOI:10.13232/j.cnki.jnju.2016.06.020
基于子空间投影SVD的MIMO穿墙雷达杂波抑制方法
An SVD method for clutter mitigation in MIMO Through-the-Wall Radar Imaging based on subspace proj ection
摘要
Abstract
Imaging and detection of the targets behind the wall are usually interfered by strong wall reflections in Through-the-Wall Radar Imaging(TWRI).The targets near the wall may even be drowned completely.Therefore, mitigating the wall clutter is of great significance for identifying the target clearly in radar imaging.Traditional methods for wall-clutter mitigation in single input and single output system(SISO)usually make use of interference canceling and spatial filtering,which are based on the invariance of the spatial characteristics of wall.The spatial filter is applied along the array aperture to remove zero-frequency and low-frequency components,which correspond to the wall electromagnetic responses.However,they are not applicable to multiple inputs and multiple outputs systems(MIMO).To remove the clutter for UWB MIMO TWR,this paper presents an effective SVDmethod based on subspace proj ection.As an Eigen-structure technique,SVD is applied to the received signal matrix to extract the target signatures.The signal space is decomposed into three subspaces:the clutter subspace,the target subspace,and the noise subspace.The clutter subspace mainly includes wall reflections,which is much stronger than target signal and noise.The clutter subspace and the target subspace can be isolated from the signal matrix according to the dominant singular components(SCs).And then,orthogonal subspace proj ection are used to mitigate wall components and make target signals prominent.Finally,MATLAB simulation software is used for modeling and simulating. From the experimental results,we can see that the proposed method is effective in removing wall reflections, suppressing clutter,and highlighting the target.This method is superior to interference canceling method. Furthermore,this SVDmethod can also remove random noises and suppress false imaging in multi-obj ect detecting, improving image quality and reliability.关键词
MIMO 穿墙雷达/墙体杂波抑制/子空间投影/奇异值分解Key words
MIMO Through-the-Wall Radar(TWR)/wall clutter mitigation/subspace proj ection/singular value de-composition(SVD)分类
信息技术与安全科学引用本文复制引用
倪裕豪,倪国新,孙晓闻,柏业超..基于子空间投影SVD的MIMO穿墙雷达杂波抑制方法[J].南京大学学报（自然科学版）,2016,52(6):1146-1153,8.基金项目
毫米波国家重点实验室开放课题(K201514) （K201514）
