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Proceedings Paper

Scattering from multilayered random rough surfaces using the Steepest Descent Fast Multipole Method (SDFMM) and the multiple interaction model
Author(s): Magda El-Shenawee
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Paper Abstract

Scattering of electromagnetic waves from multilayered random rough surfaces is crucial for subsurface sensing applications. A multiple interaction method of moments (MoM) model is used in this work to analyze scattering from two-dimensional multilayered random rough ground (3-D scattering problem) especially when the underground layer is deeply buried under the air/ground interface. The presented model removes a barrier and enables the application of the Steepest Descent Fast Multipole Method (SDFMM) to certain 3-D non-quasi-planar structures. The conventional SDFMM has been used to analyze electromagnetic wave scattering from quasi-planar structures where the scatterer's height is a fraction of a free-space wavelength. The presented model is based on multiple interactions mechanism between the air/ground interface and the buried underground layer. The basic idea of the proposed multiple scattering model is to decompose the non-quasi-planar multilayered ground into two quasi-planar scatterers where the conventional SDFMM can be applied separately to each one. The interactions between the sub-quasi-planar scatterers are calculated using the electromagnetic vector potentials near-field expressions. This model is tested and validated with the MoM on a variety of geometries. The results show that the strongest signature of the buried scatterer is mainly due to the first multiple interaction mechanism (ground-object-ground) while the contributions from repeating this mechanism become insignificant even for lossless and/or slightly lossy underground.

Paper Details

Date Published: 13 August 2002
PDF: 12 pages
Proc. SPIE 4742, Detection and Remediation Technologies for Mines and Minelike Targets VII, (13 August 2002); doi: 10.1117/12.479075
Show Author Affiliations
Magda El-Shenawee, Univ. of Arkansas (United States)

Published in SPIE Proceedings Vol. 4742:
Detection and Remediation Technologies for Mines and Minelike Targets VII
J. Thomas Broach; Russell S Harmon; Gerald J. Dobeck, Editor(s)

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