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Comptes Rendus Physique
Volume 11, n° 1
pages 77-86 (janvier 2010)
Doi : 10.1016/j.crhy.2009.12.005
Low-grazing angles scattering of electromagnetic waves from one-dimensional natural surfaces: Rigorous and approximate theories
Théories rigoureuses et approchées pour la diffraction des ondes électromagnétiques par des surfaces unidimensionnelles aux angles rasants
 

G. Soriano a, , P. Spiga b , M. Saillard c
a Institut Fresnel, CNRS/Université Aix-Marseille, Domaine Universitaire de Saint-Jérôme, avenue Escadrille Normandie-Niémen, 13397 Marseille cedex 20, France 
b Pellenc Selective Technologies, 125, rue François Gernelle, BP 124, 84124 Perthuis cedex 4, France 
c LSEET CNRS/Université du Sud-Toulon Var, BP 20132, 83957 La Garde cedex, France 

Corresponding author.
Abstract

We present a rigorous model, based on a specific boundary integral formalism for the wave scattering from rough, one-dimensional, dielectric or conducting surfaces at low-grazing incidence and scattering angles. Even though this so-called Grazing Method of Moment is, from a numerical cost point of view, independent of the incidence, it remains very numerically demanding. We thus propose an extrapolation technique for faster monostatic diagram computation, based on the theoretical behavior of the scattering amplitude at low-grazing angles. This technique is compared to the GMoM and to some approximate models, for surfaces with Gaussian spectrum as well as for sea surface.

The full text of this article is available in PDF format.
Résumé

Nous présentons un modèle rigoureux, fondé sur un formalisme intégral de frontière spécifique, pour la diffraction des ondes par des surfaces rugueuses unidimensionnelles, diélectriques ou conductrices, aux angles rasants. Même si cette méthode, appelée GMoM, est, en termes de coût numérique, indépendante de l’incidence, elle reste numériquement très exigeante. Nous proposons donc une technique d’extrapolation pour le calcul rapide des diagrammes monostatiques, fondée sur le comportement théorique de l’amplitude de diffraction aux angles rasants. Cette technique est comparée à la GMoM et à des modèles approchés, pour des surfaces à spectre gaussien ainsi que pour la surface de la mer.

The full text of this article is available in PDF format.

Keywords : Remote sensing, Low-grazing angles, Natural surfaces

Mots-clés : Télédétection, Angles rasants, Surfaces naturelles




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