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.
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.
@article{CRPHYS_2010__11_1_77_0, author = {G. Soriano and P. Spiga and M. Saillard}, title = {Low-grazing angles scattering of electromagnetic waves from one-dimensional natural surfaces: {Rigorous} and approximate theories}, journal = {Comptes Rendus. Physique}, pages = {77--86}, publisher = {Elsevier}, volume = {11}, number = {1}, year = {2010}, doi = {10.1016/j.crhy.2009.12.005}, language = {en}, }
TY - JOUR AU - G. Soriano AU - P. Spiga AU - M. Saillard TI - Low-grazing angles scattering of electromagnetic waves from one-dimensional natural surfaces: Rigorous and approximate theories JO - Comptes Rendus. Physique PY - 2010 SP - 77 EP - 86 VL - 11 IS - 1 PB - Elsevier DO - 10.1016/j.crhy.2009.12.005 LA - en ID - CRPHYS_2010__11_1_77_0 ER -
%0 Journal Article %A G. Soriano %A P. Spiga %A M. Saillard %T Low-grazing angles scattering of electromagnetic waves from one-dimensional natural surfaces: Rigorous and approximate theories %J Comptes Rendus. Physique %D 2010 %P 77-86 %V 11 %N 1 %I Elsevier %R 10.1016/j.crhy.2009.12.005 %G en %F CRPHYS_2010__11_1_77_0
G. Soriano; P. Spiga; M. Saillard. Low-grazing angles scattering of electromagnetic waves from one-dimensional natural surfaces: Rigorous and approximate theories. Comptes Rendus. Physique, Volume 11 (2010) no. 1, pp. 77-86. doi : 10.1016/j.crhy.2009.12.005. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2009.12.005/
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