Forward Simulation of Ground Penetrating Radar Based on the Element-Free Galerkin Method
详细信息
- 责任者：Feng Deshan (School of Geosciences and Info-Physics ; Central South University ; Changsha 410083 ; China) ; Wang Honghua
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(1)
- 关键词：地质雷达 ; geological radar ; 正演模拟 ; forward modelling
- 页码：p.298-308
- 图表：illus., 1 table, 35 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
Forward simulation of Ground Penetrating Radar(GPR) is conducted by the element-free Galerkin method(EFGM) which has advantages such as simple preprocessing,high precision and solution of the high-order continuous derivatives,so it only requires nodes without elements and adopts the moving least-squares(MLS) fitting field function.The wave equation that the GPR forward simulation needs to satisfy is derived starting with the Maxwell equation,and then the constructing method of the MLS shape function is presented in detail.To address the complicated processing of the imposed boundary conditions,a penalty factor is employed to process the imposed boundary condition because the EFGM cannot meet the interpolation condition.Meanwhile,to eliminate ultra-intense reflection from the truncated boundary when the EFGM is employed in the GPR forward simulation,the truncated boundary condition is used to transmit the reflected waves from the truncated boundary,so as to restrain these reflected waves.A Matlab program for GPR forward simulation based on the EFGM is compiled and used in the forward simulation for the typical GPR geoelectric model.A comparison of the resultant profile from the simulation with the FEM forward-simulation profile based on linear interpolation shows that the EFGM simulation has better continuity and smoothness,and the consistency of the simulation results indicates the correctness and effectiveness of the EFGM used for GPR forward computation.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |