Imagerie Radar à Synthèse dOuverture interférométrique et polarimétrique. Application au suivi des glaciers alpins.

Abstract : In this PhD thesis, two main axes have been investigated.
The first methodological part of this thesis proposes a particular focus on speckle filtering of POL-InSAR multivariate data and its implication on parameter estimation.

The objective of speckle filtering is to retrieve the radiometric and spatial scene information from the observed speckled SAR measurement.
Three main directions for gaining in stationarity/ergodicity have been investigated: signal adaptive neighbourhoods, non-adaptive/adaptive estimators and compensation of deterministic components in the interferometric phase signal.
This thesis proposes a novel strategy for filtering multivariate SAR images, namely the use of adaptive neighbourhoods obtained by multivariate region growing techniques.
According to this algorithm, named IDAN, all the available intensity images of the polarimetric or/and interferometric components are fused in the region growing process to ensure the validity of the stationarity/ergodicity assumptions.
A novel method for estimating local frequencies in SAR interferograms is proposed.
These algorithms have been tested both on several high resolution airborne data sets, and on low resolution spaceborne tandem ERS SAR images.

The second part of this thesis is dedicated to Alpine glacier monitoring by SAR remote sensing.
This part tackles the problem of processing multivariate SAR data over the Chamonix Mont-Blanc test site.
The first application presented consists in measuring the 3D displacement field of an Alpine glacier by D-InSAR.
The analysis of several tandem ERS interferograms between July 1995 and April 1996 shows that it is possible to measure temperate glacier surface velocity fields from October to April in 1-day C-band interferograms with approximately 20-meter ground sampling.
The second application is represented by the first POL-InSAR analysis of multiband high resolution airborne SAR data acquired by the ESAR system in October 2006
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Gabriel Vasile. Imagerie Radar à Synthèse dOuverture interférométrique et polarimétrique. Application au suivi des glaciers alpins.. Traitement du signal et de l'image [eess.SP]. Université de Savoie; Université Polytechnique de Bucarest, 2007. Français. ⟨tel-00252141⟩

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