Robust distributed calibration of radio interferometers with direction dependent distortions

Virginie Ollier 1, 2 El Korso 3 André Ferrari 4 Remy Boyer 1, 5 Pascal Larzabal 2
1 L2S - Laboratoire des signaux et systèmes
2 SATIE - Systèmes et Applications des Technologies de l'Information et de l'Energie
3 LEME - Laboratoire Energétique Mécanique Electromagnétisme
4 LAGRANGE - Joseph Louis LAGRANGE
5 CRIStAL - Centre de Recherche en Informatique, Signal et Automatique de Lille (CRIStAL) - UMR 9189
Abstract : In radio astronomy, accurate calibration is of crucial importance for the new generation of radio inter-ferometers. More specifically, because of the potential presence of outliers which affect the measured data, robustness needs to be ensured. On the other hand, calibration is improved by taking advantage of these new instruments and exploiting the known structure of parameters of interest across frequency. Therefore, we propose in this paper an iterative robust multi-frequency calibration algorithm based on a distributed and consensus optimization scheme which aims to estimate the complex gains of the receivers and the directional perturbations caused by the ionosphere. Numerical simulations reveal that the proposed distributed calibration technique outperforms the conventional non-robust algorithm and per-channel calibration.
Keywords : radio astronomy multi-frequency Calibration robustness
Type de document :
Article dans une revue
Signal Processing, Elsevier, 2018, 153, pp.348-354. 〈10.1016/j.sigpro.2018.07.024 〉
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https://hal-centralesupelec.archives-ouvertes.fr/hal-01851032
Contributeur : Remy Boyer <>
Soumis le : samedi 28 juillet 2018 - 20:29:28
Dernière modification le : jeudi 7 février 2019 - 14:28:10
Document(s) archivé(s) le : lundi 29 octobre 2018 - 12:25:58

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CENTRALESUPELEC | SUP_LSS | SUP_SIGNAUX | ENS-CACHAN | OCA | INSTITUT-TELECOM | SATIE | UNIV-CERGY | LAGRANGE | CRISTAL | IFSTTAR | INRIA | UNICE | UNIV-LILLE | L2S | UNIV-PARIS-SACLAY | UNIV-COTEDAZUR | UNIV-HESAM

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Virginie Ollier, El Korso, André Ferrari, Remy Boyer, Pascal Larzabal. Robust distributed calibration of radio interferometers with direction dependent distortions. Signal Processing, Elsevier, 2018, 153, pp.348-354. 〈10.1016/j.sigpro.2018.07.024 〉. 〈hal-01851032〉

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