基于信号特征值相关性去除穿墙雷达直达波  

Removing Direct Wave of Through-Wall Radar Based onCorrelation of Signal Eigencalues

作　　者：李邦宇[1] 许会[1] 姚丽[1] 

机构地区：[1]沈阳工业大学信息科学与工程学院,辽宁沈阳110870

出　　处：《计算机仿真》2012年第11期75-78,共4页Computer Simulation

基　　金：辽宁省教育厅创新团队项目(2009T074);沈阳市科技计划项目(F10-213-1-00)

摘　　要：穿墙雷达是一种用来探测被障碍物遮挡目标的新型雷达,障碍物对于穿墙雷达成像影响较大,回波中的目标信号往往淹没在直达波信号中。目前所提出的算法不能够完全去除直达波信号,或者在去除直达波信号的同时削弱了目标信号的幅度,影响目标信号的识别。针对超宽带步进变频穿墙雷达中去除直达波的问题,提出采用奇异值分解的方法提取回波信号中的目标信号分量和直达波信号分量,并去除直达波信号,最后采用HFSS仿真软件进行建模仿真。仿真结果表明,奇值分解方法能够有效去除直达波信号,并且能够保留目标信号的绝大部分信息,优于对消法。改进方法是处理相干信号的一种比较有效的手段,可用于强干扰噪声环境下的噪声去除。Through-wall radar is a new type radar for detecting target blocked by obstacles. Obstacles affect the imaging of through-wall radar badly, and target signals in echo signals are often submerged in the direct waves. The current algorithms can not remove the direct wave signals fully, or reduce the magnitudes of the target signals at the same time of removing the direct wave signals, which influences the recognition for target signals. The problem of re- moving the direct wave for UWB stepped frequency radar was discussed in this paper. A singular value decomposition method was proposed for extracting the target echo signal components and the direct wave signal components and then removing the direct wave. Finally, HFSS simulation software was used for modeling and simulating, and collecting data in the simulation results. From the simulation results, we can see that the direct wave signals can be removed ef- fectively using this method, and in the process of removing direct wave signals, most of the target components of sig- nals are preserved. This method is superior to Interference Canceling method. The singular value decomposition meth- od is more effective to deal with coherent signals, and can be used to remove noises in the environment of strong inter- ferences.

关 键 词：超宽带 步进变频穿墙雷达 目标检测 直达波去除 奇异值分解 

分 类 号：TN958.94[电子电信—信号与信息处理]