摘要
探地雷达分辨率限制着探地雷达对目标的识别能力。本文通过对探地雷达回波波形分析,提出利用回波频谱信息提高探地雷达垂直分辨率。首先通过构建电磁波在分层媒质中的传输模型,得到探地雷达对四层介质的频谱传输函数;接着通过计算不同目标厚度模型对应的回波频谱,来拟合真实回波频谱,从而根据拟合误差曲线提取目标厚度。此方法避免了传统反褶积法求取反射系数不唯一、误差大的缺陷。通过对仿真数据和实验数据的处理,证实了本文所提方法起到了提高垂直分辨率的效果。
The resolution of ground penetrating radar restricts its recognition power. According to the analysis of thin layer reflection wave, this paper presents a method using spectrum information to improve the vertical resolution of GPR. At first, the transmission model of electromagnetic wave in layered media is studied, and then the spectrum transmission function of GPR in four layers is built. The spectrum of the echo wave is fitted through computing the echo spectrums for different thickness layers. According to the fitting error curve, the thickness of the target layer can be picked up. This method avoids the shortcomings of traditional deconvolution method. Through processing the simulation data and experiment data, the effectiveness of this method in improving the vertical resolution of GPR is proved.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2010年第7期1448-1453,共6页
Chinese Journal of Scientific Instrument
基金
国家科技支撑计划(2008BADA8B02)
国家自然科学基金(批准号40976114)资助项目
关键词
探地雷达
垂直分辨率
频谱
拟合
ground penetrating radar
vertical resolution
spectrum
fitting
