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Analyse Temps-Fréquence appliquée à l'imagerie SAR polarimétrique.

Abstract : SAR imaging considers target as a set of scatterers, ponctual, isotropic and non-dispersive. This assumption becomes obsolet for new applications radar using a large band and a large angular spreading. The aim is to study the non-stationary behavior by using the basic tool : the timefrequency analysis. The usual time-frequency transforms allow to build hyperimages (images in 4 dimensions) describing the energy versus emitted frequency and observation angle. This information source is lain to radar cross-section (RCS). Another information source in radar imaging is polarimetry.The goal is to joint use these two information sources to characterize scatterers. By applying continuous wavelet and polarimetric coherent decompositions on the Sinclair matrix, some polarimetric hyperimages are built. These hyperimages allow to describe the polarimetric behavior versus the observation angle and the emitted frequency.In some case, they globally describe the backscattering mecanism by its nature, its relative orientation in the horizontal plan, its absolute orientation in the vertical plan. Moreover, they highlight a new phenomenum : the polarimetric non-stationary. This woul be caused by the fact the radar does not see the same geometry during the processing. From polarimetric hyperimages, a new phenomenological classification is proposed
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Submitted on : Monday, May 3, 2010 - 5:48:50 PM
Last modification on : Wednesday, April 27, 2022 - 3:55:22 AM
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  • HAL Id : tel-00480262, version 1


Mickaël Duquenoy. Analyse Temps-Fréquence appliquée à l'imagerie SAR polarimétrique.. Traitement du signal et de l'image [eess.SP]. Université Rennes 1, 2009. Français. ⟨tel-00480262⟩



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