非均匀空间采样下的表层穿透雷达逆时偏移成像算法  

SURFACE PENETRATING RADAR OF NON-UNIFORM SPATIAL SAMPLING AND REVERSE TIME MIGRATION IMAGING ALGORITHM

作　　者：雷文太[1] 黄春琳[1] 粟毅[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《工程地球物理学报》2006年第3期161-166,共6页Chinese Journal of Engineering Geophysics

基　　金：国家863高技术计划项目(项目编号:2001AA132020)资助

摘　　要：提出了一种冲激脉冲表层穿透雷达(ImpSPR:Impulse Surface Penetrating Radar)非均匀空间采样下的逆时偏移(NUSS-RTM:Non uniform Spatial Sampling Reverse Time Migration)成像算法。ImpSPR对表层下区域进行探测时,当空间采样非均匀分布时,基于快速傅里叶变换的距离偏移(RM:Range Migra-tion)成像算法和衍射层析成像算法不再是一种有效的方法。需要进行坐标轴拉伸变换或采用非均匀傅里叶变换进行成像处理,算法流程复杂。本文以波动方程RTM处理为基础,运用泰勒级数展开得到了波场关于空间维方向导数的二阶精度差分格式,导出了NUSS-RTM成像算法并给出了具体的差分网格实现形式。通过对ImpSPR实测数据的处理,结果表明NUSS-RTM成像算法可有效地应用于ImpSPR非均匀采样或均匀采样下的高分辨成像。With a non- uniform spatial sampling, reverse time migration imaging algorithm is presented in this paper. In ImpSPR＇s application, range migration imaging algorithm and diffraction tomography imaging algorithm both based on FFT are all invalid in case of non - uniform spatial sampling scanning. Either coordinates scaling transformation or non - uniform FFT is needed to modify the above imaging algorithms and thus causes complex imaging procedure. Based on scale wave equation and second order accuracy finite difference operator of spatial partial derivative, a NUSS- RTM imaging algorithm is educed in this paper. It＇s finite difference grid form and migration realization is also given subsequently. Through processing experimental data obtained by a SPR system - RadarEye, NUSS - RTM imaging gorithm validates its capability at the aspect of ImpSPR＇s high resolution imaging application.

关 键 词：冲激脉冲表层穿透雷达 逆时偏移 非均匀采样 

分 类 号：P631[天文地球—地质矿产勘探] TN957[天文地球—地质学]