SKA Telescope Configuration and Compressed - Jean

Proposition de stage au CEA - 2013/2014
• Directeurs de stage :
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Jean-Luc Starck
Laboratoire CosmoStat (http://www.cosmostat.org)
Service d’Astrophysique, CEA Saclay, 91191 Gif-sur-Yvette
E-mail: [email protected]
Tel : 01 69 08 57 64
http://jstarck.free.fr
Filipe Abdalla (co-directeur)
Department of Physics & Astronomy,
UCL, London WC1E 6BT
E-mail: [email protected]
• Lieu du stage : Service d’Astrophysique, CEA Saclay
• Durée souhaitée : minimum 3 mois
• Stage débouchant sur une thèse: Eventuellement
• Thèmes scientifiques:
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Image restoration and Compressed Sensing
Deconvolution
Shape measurement
Projet SKA
Cosmology, weak lensing
Résumé du sujet proposé:
SKA Telescope Configuration and Compressed Sensing
1. Contexte scientifique du stage
The SKA (Square Kilometre Array, http://www.skatelescope.org) will be the largest
radio interferometer instrument in 2020 and will allow us to build radio-images with
very high resolution quality and high sensitivity. The resolution of this telescope will
depend on the wavelength but most critically on the configuration, which is not yet
fully determined. The goal of this project is to compare the image quality that one can
achieve with several configuration types which would cost as much to build and
provides feedback to the international project as to what is the best configuration.
2. Programme de recherche
Recent papers have established the link between radio imaging and the compressed
sensing theory. New algorithms based on the proximal theory have shown to
outperform significantly the traditional techniques. With better methods, we can afford
to build hardware which takes less data and is hence cheaper, but that achieve the
same performance. This work will consists in evaluation how well these new methods
performs in different array configurations.
3. Moyens techniques/informatiques
Le stage nécessitera l'apprentissage de techniques de traitement du signal
(déconvolution, problèmes inverse, parcimonie, théorie proximale, etc), la conception
et le développement de code (en IDL et C++), et l'application de ce code a des
données astronomiques.
Le développement se fera sur machine MAC/OS X.