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Electromagnetic scattering of underground object using nonuniform mesh FDTD and PML
Author(s) -
Yu Wenhua,
Mittra Raj
Publication year - 1999
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(19990420)21:2<151::aid-mop18>3.0.co;2-q
Subject(s) - finite difference time domain method , perfectly matched layer , microwave , truncation (statistics) , scattering , electromagnetic radiation , optics , computational electromagnetics , physics , computer science , acoustics , electromagnetic field , telecommunications , machine learning , quantum mechanics
In this paper, we present a finite‐difference time‐domain (FDTD) algorithm for modeling buried objects using very low frequencies, e.g., those in the ELF range. It is shown how long‐wavelength electromagnetic signals, guided by the earth–ionosphere waveguide and serving as illuminating sources, are scattered by underground structures, and that that scattered fields may be measured above the earth surface, and subsequently analyzed to yield the location of the underground objects. The problem of large computational domains is made manageable via the use of the nonuniform FDTD, and the mesh truncation aspect is addressed by using the perfectly matched layer (PML) concept. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 21: 151–156, 1999.