Diffusion Des Ondes Électromagnétiques Par Des Surfaces Rugueuses
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Dans le cadre de la télédétection hyperfréquence active, un des objectifs est l'analyse de l'écho radar recueilli après son interaction avec la surface de la terre, afin de remonter aux paramètres physiques et géométriques de la scène observée. Pour mieux appréhender ce problème inverse, une bonne connaissance du problème direct reste indispensable. Ce livre traite de l'étude de la diffraction d'une onde électromagnétique par une surface rugueuse aléatoire, séparant deux milieux homogènes. Une méthode exacte, donnant les intensités cohérentes et incohérentes d'une surface rugueuse 1D ou 2D aléatoire, éclairée par une onde plane, a été développée. Cette méthode est basée sur la résolution des équations de Maxwell dans un système de coordonnées non orthogonales, lié à la surface. Les surfaces considérées sont des réalisations d'un processus spatial aléatoire gaussien et isotrope. La génération des profils diffractants est assurée par filtrage linéaire. Les paramètres statistiques des profils sont estimés à partir de fichiers numériques de sols agricoles nus. Nous avons investi la méthode numériquement et comparé nos résultats à la littérature ainsi qu'à des données expérimentales.
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