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Recherche de discriminants polarimétriques dans la diffraction par des objets situés à proximité de l'interface plan entre deux milieux diélectriques à pertes.

Abstract : The polarimetric behaviour of the field diffracted by a target in front of the air-soil interface was investigated for an incident field varying from perpendicular to grazing incidence. The backscattered field for a monostatic alignment was analysed by the geometrical theory of diffraction (GTD) or etalon method. Here, a refined ray model was implemented. A special emphasis was attributed to the transition zones, where near such shadow boundaries, the reflected space rays disappear and transform into creeping rays on the target, which are strongly attenuated on the shadow size. The investigations proved that the elements of the Sinclair matrix [S] and the corresponding polarisation states undergo a rapid variation on the Poincaré sphere. The significant locations on the Poincaré sphere can be exploited to extract information about the geometrical parameters or geophysical properties of the soil.
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https://tel.archives-ouvertes.fr/tel-00012029
Contributor : Joelle Drouet <>
Submitted on : Friday, March 24, 2006 - 2:28:41 PM
Last modification on : Friday, January 8, 2021 - 3:41:25 AM
Long-term archiving on: : Saturday, April 3, 2010 - 10:04:35 PM

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  • HAL Id : tel-00012029, version 1

Citation

Nicolas Marquart. Recherche de discriminants polarimétriques dans la diffraction par des objets situés à proximité de l'interface plan entre deux milieux diélectriques à pertes.. Traitement du signal et de l'image [eess.SP]. Université Rennes 1, 2006. Français. ⟨tel-00012029⟩

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