Scattering from multilayered random rough surfaces using the Steepest Descent Fast Multipole Method (SDFMM) and the multiple interaction model

Magda El-Shenawee

doi:10.1117/12.479075

13 August 2002 Scattering from multilayered random rough surfaces using the Steepest Descent Fast Multipole Method (SDFMM) and the multiple interaction model

Magda El-Shenawee

Author Affiliations +

Proceedings Volume 4742, Detection and Remediation Technologies for Mines and Minelike Targets VII; (2002) https://doi.org/10.1117/12.479075
Event: AeroSense 2002, 2002, Orlando, FL, United States

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.

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Magda El-Shenawee "Scattering from multilayered random rough surfaces using the Steepest Descent Fast Multipole Method (SDFMM) and the multiple interaction model", Proc. SPIE 4742, Detection and Remediation Technologies for Mines and Minelike Targets VII, (13 August 2002); https://doi.org/10.1117/12.479075

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KEYWORDS

Multiple scattering

Magnetism

Scattering

Interfaces

Multilayers

3D modeling

Electromagnetic scattering

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