一种探地雷达回波信号的非平稳特性分析方法.pdf

2011年8月
电子测斌
Au2011
前8
ELECTRONIC TEST
No 8
种探地雷达回波信号的非平稳特性分析方法
张永山,张丹,李剑,张波涛,李闯泽
(1中北大学信息探测与处理技术研究所,山西太原030051;2中北大学理学院,山西太原,030051
摘要:针对传统的傅里叶变换已无法满足非平稳信号的分析,本文提出了探地雷达回波信号的短时傅里叶变换
分析方法,这种方法可有效消除探地雷达回波信号的干扰和杂波。首先介绍了探地雷达系统设计原理及其工作
过程,在此基础上,分析了典型的探地雷达回波信号特征、介绍了短时傅里叶变换原理,短时傅里叶变换持有
的时频局域化特性非常适用于非平稳信号处理分析,最后通过实验验证,证明了该方法的有效性,从而为探地
达信号预处理开辟了一…条有效的途径。
关键词:探地雷达;非平稳信号;短时傅里叶变换
中图分类号:TN914
文就标识码:A
Ground Penetrating Radar signal echo analysis
of non-stationarity
Zhang Yongshan', Zhang Dan, Li Jian, Zhang Botao Li Chuangze
(1 Institute of Signal Capturing &Processing Technology, North University of China, Shanxi Taiyuan, 030051, China;
2 College of Science, North University of China, Shanxi Taiyuan, 030051, China
Abstract: The traditional Fourier trans orm already cannot satisfy the non-stationary signal analysis, so short-time
Fourier transform analysis method of Ground Penetrating Radar echo signal has been proposed in this paper. The
method can effectively eliminate interference and cutter of Ground Penetrating Radar echo signal. Firstly, GPR systems
design principle and working process have been introduced in the paper. Secondly, the typical ground-penetrating radar
echo signal features has been analyzed and the short-time Fourier trans orm principle has been introduced, o Helding
by the short time Fourier transform time-frequency localization properties very uses for processing non-stationary
signal. Finally, experimental results has demonstrated the validity of this method, which opens up an effective way for
GPR preprocessing signals
Keywords: Ground Penetrating Radar(GPR) on-stationary signal; the short time Fourier transform
0引离
无污染、探测结果直观,可以探测地下金属和非金属目标
探地雷达GPR( Ground Penetrating Radan)是一种用于等特点,正在国民经济建设、军队信息化和现代化建设中,
确定地下介质分布的广谐电磁技术,是一种通过发射和接发挥着重要作用
收高频率、宽脉冲电磁波,并根据接收到的电磁波的振幅
探地雷达回波信号是一种非平稳信号组合,包含了多
波形和频率等运动学和动力学特征来分析和推断地下介质种干扰和杂波,回波信号预处理的目的就是去除干扰和杂
结构、地层岩性特征的浅层地球物理探测技术叫。在地下波,本文提出的短时傅里叶变换分析方法很好的达到了预
目标探测的众多手段中,因其具有高效率、高分辨、低成本、处理的效果,通过实测数据证明了该方法的有效性,从而
甲测i过