探地雷达数值模拟中广义完全匹配层吸收边界条件的模拟分析  

Forward Modeling of GPML Absorbing Boundary Conditions in GPR Simulation

作　　者：杨天春[1] 李好 张辉[1] 

机构地区：[1]湖南科技大学土木工程学院,湘潭411201 [2]中煤科工集团重庆研究院,重庆400037

出　　处：《计算物理》2014年第2期200-206,共7页Chinese Journal of Computational Physics

基　　金：湖南省自然科学基金(12JJ3035);湖南省科技计划(2011SK3195)资助项目

摘　　要：探讨探地雷达正演模拟中,应用广义完全匹配层(GPML)吸收边界条件时的模拟效果.利用时域有限差分(FDTD)法将麦克斯韦方程离散化,再采用Mur超吸收边界条件和GPML吸收边界条件吸收向外的电磁波,模拟充水岩溶的雷达图像;同时,采用GPML吸收边界条件模拟多个圆柱体异常模型和倾斜界面异常模型的探地雷达剖面图像.对模拟结果的分析可知,GPML吸收边界条件可有效地吸收向外的电磁波,其吸收效果优于Mur超吸收边界条件,在探地雷达的应用中可推广应用.Modeling of generalized perfectly matched layer （GPML） absorbing boundary conditions in ground penetrating radar （GPR） simulation is discussed. Maxwell＇ s equations are discretized by finite-difference time domain （FDTD） method, and M ur super absorbing boundary conditions and GPML absorbing boundary conditions are adopted to simulate GPR sections of a water-filled karst. GPR images of a multi-cylinder model and an inclined interface model are obtained by FDTD method with GPML absorbing boundary conditions. It shows that as an absorbing boundary condition GPML absorbs outgoing wave effectively. Its absorbing effect is better than that of Mur super absorbing boundary conditions. It can be applied to GPR simulations.

关 键 词：探地雷达 时域有限差分法 广义完全匹配层 正演模拟 

分 类 号：P631[天文地球—地质矿产勘探]