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Proceedings Paper

Directional decomposition and generalized-screen approximation for the scattering of electromagnetic waves in isotropic frequency dependent media
Author(s): Jerome H. Le Rousseau; Maarten V. de Hoop; Gary R. Olhoeft
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Paper Abstract

The electromagnetic wavefield is decomposed into up- and downgoing constituents, which allows the introduction of the one-way wave operator. Transverse scattering is taken into account by a pseudodifferential operator, the vertical slowness operator. The actual computation of the one-way wave propagator is made feasible by the introduction of the so- called generalized-screen approximation of the vertical slowness symbol. The medium is defined in terms of a background medium and a perturbation. Such a contrast formulation induces a polyhomogeneous series expansion of the vertical slowness symbol in both the magnitude and the smoothness of the medium perturbation; the addition of higher- order terms of the series expansion increases the accuracy of the one-way generalized-screen propagator. The medium parameters, dielectric permittivity and magnetic permeability, are described by Cole-Cole distributions to allow a realistic description of frequency dependent medium properties. These results are then cast into a family of fast numerical algorithms. We analyze the accuracy of the generalized-screen method in complex structures using synthetic models that exhibit significant multiple scattering. The generalized- screen method shows accuracy for wide-angle propagation as well as for the prediction of multi-pathing.

Paper Details

Date Published: 27 April 2000
PDF: 6 pages
Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); doi: 10.1117/12.383527
Show Author Affiliations
Jerome H. Le Rousseau, Colorado School of Mines (United States)
Maarten V. de Hoop, Colorado School of Mines (United States)
Gary R. Olhoeft, Colorado School of Mines (United States)

Published in SPIE Proceedings Vol. 4084:
Eighth International Conference on Ground Penetrating Radar
David A. Noon; Glen F. Stickley; Dennis Longstaff, Editor(s)

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