The unsplit convolutional perfectly matched layer absorption performance analysis of evanescent wave in GPR FDTD forward modeling

doi:10.6038/cjg20161232

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	The unsplit convolutional perfectly matched layer absorption performance analysis of evanescent wave in GPR FDTD forward modeling
	Feng De-Shan 1,3; Yang Liang-Yong 1,2; Wang Xun 1,3
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2016-12-01
卷号	59 期号:12 页码:4733-4746
关键词	Ground Penetrating Radar Convolutional perfectly matched layer Uniaxial perfectly matched layer Evanescent wave Finite difference time domain method
DOI	10.6038/cjg20161232
文献子类	Article
英文摘要	This article introduces the principle of CPML boundary conditions, and deduces its FDTD formula for GPR forward modeling, and then compares and analyzes the absorption properties of evanescent wave in Berenger PML, UPML, CPML. The numerical experiment of key parameters K and a in PML were performed so as to determine its range and selection principles. Then, using the two-dimensional TM wave as an example, we studied the mechanism of evanescent wave generation and the influence factors of absorption properties. Wavefield snapshot of uniform medium, reflection error at detection point and global reflection error comparison shows that the three kinds of PML have fabulous absorption capacity to travelling wave, but quite different to evanescent wave, especially in the low-frequency. Because the parameter a was introduced, the absorption of evanescent wave in CPML is exceptionally excellent; however, the global error is the largest caused by discretization. Finally, we used the FDTD program with UPML and CPML boundary conditions to carry out 2D GPR forward modeling using profile method and wide-angle method on rectangular geoelectric model and 3D uniform medium model. From the experiment, we observed that there is a huge influence of evanescent wave on both the radar forward modeling profile and wavefield snapshot. Furthermore, taking the absorption performance of evanescent wave by UPML and CPML into consideration, we can determine that CPML can effectively reduce the reflection error in truncation boundary, and obtain a satisfying accuracy. Considering the absorption performance of evanescent wave, the global error, programming difficulty and other factors, in the GPR forward modeling, we highly recommend the use of CPML boundary condition in GPR studies.
WOS关键词	ABSORBING BOUNDARY-CONDITIONS ; GROUND-PENETRATING RADAR ; FREQUENCY-SHIFTED PML ; HIGH-ORDER FDTD ; NUMERICAL-SIMULATION ; ADI-FDTD ; RECURSIVE INTEGRATION ; DISPERSIVE MEDIA ; CFS-PML ; EQUATIONS
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000389683800032
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53179]
专题	地质与地球物理研究所_其他部门
作者单位	1.Cent S Univ, Sch Geosci & Infophys, Changsha 410083, Hunan, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Minist Educ, Key Lab Metallogen Predict Nonferrous Met, Changsha 410083, Hunan, Peoples R China
推荐引用方式 GB/T 7714	Feng De-Shan,Yang Liang-Yong,Wang Xun. The unsplit convolutional perfectly matched layer absorption performance analysis of evanescent wave in GPR FDTD forward modeling[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2016,59(12):4733-4746.
APA	Feng De-Shan,Yang Liang-Yong,&Wang Xun.(2016).The unsplit convolutional perfectly matched layer absorption performance analysis of evanescent wave in GPR FDTD forward modeling.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,59(12),4733-4746.
MLA	Feng De-Shan,et al."The unsplit convolutional perfectly matched layer absorption performance analysis of evanescent wave in GPR FDTD forward modeling".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 59.12(2016):4733-4746.