基于探地雷达的有耗介质脱空薄层厚度估计方法  

Thickness Determination Method for Thin Void-layer of Lossy Medium Using Ground Penetrating Radar

作　　者：段昌淼[1] 吴仁彪[1] 刘家学[1] 

机构地区：[1]中国民航大学天津市智能信号与图像处理重点实验室,天津300300

出　　处：《信号处理》2011年第10期1581-1585,共5页Journal of Signal Processing

基　　金：国家自然科学基金资助项目(No.60879019);民航总局科技基金资助项目(No.MHDR0701)

摘　　要：探地雷达在机场道面脱空检测中可以取得较好效果,但还不能准确估计有耗介质中的脱空厚度。针对此问题,本文通过分析脱空薄层复合反射回波的振幅响应和有耗介质中的电磁波传播模型,将常规薄层调谐厚度方法推广到有耗介质,提出了一种新的薄层厚度估计方法。首先推导有耗介质中脱空薄层反射回波的主频振幅随厚度变化的振幅响应,然后基于最小二乘曲线拟合方法修正主频振幅响应,减小接收信号未建模误差和参数估计误差对脱空厚度估计精度的影响。仿真结果表明,基于本文方法所取得的估计精度明显高于基于未修正的主频振幅响应方法。Ground Penetrating Radar（GPR） can achieve good result in the void detection of airfield runways,but it is still impossible to correctly estimate the void thickness in lossy medium.To solve this problem,based on the amplitude response of complex echoes reflected from thin void layer and the electromagnetic（EM） wave propagation model in lossy medium,this paper extends conventional turning thickness method to lossy medium and proposes a novel thin-layer thickness determination method.Firstly,the amplitude response between amplitude corresponding to predominant frequency and void thickness was deduced.Then the predominant frequency amplitude response was modified by least-square curve fitting method,which can reduce the effects of unmolded error and parameter estimation error to estimation accuracy of void thickness.Simulation results demonstrate that the estimation accuracy of proposed method is obviously higher than that obtained by unmodified method.

关 键 词：探地雷达 脱空检测 薄层 电磁波传播模型 有耗介质 

分 类 号：TN959.71[电子电信—信号与信息处理]