Snowpack permittivity profile retrieval from tomographic SAR data

Badreddine Rekioua; Matthieu Davy; Laurent Ferro-Famil; Stefano Tebaldini

doi:10.1016/j.crhy.2015.12.016

Snowpack permittivity profile retrieval from tomographic SAR data

Présenté par : M. Denis Gratias

Badreddine Rekioua ^1,² ; Matthieu Davy ² ; Laurent Ferro-Famil ³ ; Stefano Tebaldini ²

¹ IETR UMR CNRS 6164, Université de Rennes-1, 35000 Rennes, France
² Ecole militaire polytechnique de Bordj El Bahri, 16111, Alger, Algeria
³ Dipartimento di Electronica, Informazione e Bioingegneria, Politecnico di Milano, 20133 Milano, Italy

Comptes Rendus. Physique, Volume 18 (2017) no. 1, pp. 57-65.

Résumé

This work deals with 3D structure characterization and permittivity profile retrieval of snowpacks by tomographic SAR data processing. The acquisition system is a very high resolution ground based SAR system, developed and operated by the SAPHIR team, of IETR, University of Rennes-1 (France). It consists mainly of a vector network analyser and a multi-static antenna system, moving along two orthogonal directions, so as to obtain a two-dimensional synthetic array. Data were acquired during the AlpSAR campaign carried by the European Space Agency and led by ENVEO. In this study, tomographic imaging is performed using Time Domain Back Projection and consists in coherently combining the different recorded backscatter contributions. The assumption of free-space propagation during the focusing process is discussed and illustrated by focusing experimental data. An iterative method for estimating true refractive indices of the snow layers is presented. The antenna pattern is also compensated for. The obtained tomograms after refractive index correction are compared to the stratigraphy of the observed snowpack.

Reçu le : 2015-08-24
Accepté le : 2015-12-01
Publié le : 2016-02-19

DOI : 10.1016/j.crhy.2015.12.016

Mots clés : Snowpack, Snow permittivity, SAR, SAR tomography, GB-SAR, Time domain back projection

Affiliations des auteurs :

Badreddine Rekioua ^{1, 2} ; Matthieu Davy ² ; Laurent Ferro-Famil ³ ; Stefano Tebaldini ²

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     author = {Badreddine Rekioua and Matthieu Davy and Laurent Ferro-Famil and Stefano Tebaldini},
     title = {Snowpack permittivity profile retrieval from tomographic {SAR} data},
     journal = {Comptes Rendus. Physique},
     pages = {57--65},
     publisher = {Elsevier},
     volume = {18},
     number = {1},
     year = {2017},
     doi = {10.1016/j.crhy.2015.12.016},
     language = {en},
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%A Matthieu Davy
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Badreddine Rekioua; Matthieu Davy; Laurent Ferro-Famil; Stefano Tebaldini. Snowpack permittivity profile retrieval from tomographic SAR data. Comptes Rendus. Physique, Volume 18 (2017) no. 1, pp. 57-65. doi : 10.1016/j.crhy.2015.12.016. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2015.12.016/

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