Robust calibration of radio interferometers in multi-frequency scenario

Abstract : This paper investigates calibration of sensor arrays in the radio astronomy context. Current and future radio telescopes require com-putationally efficient algorithms to overcome the new technical challenges as large collecting area, wide field of view and huge data volume. Specifically, we study the calibration of radio interferometry stations with significant direction dependent distortions. We propose an iterative robust calibration algorithm based on a relaxed maximum likelihood estimator for a specific context: i) observations are affected by the presence of outliers and ii) parameters of interest have a specific structure depending on frequency. Variation of parameters across frequency is addressed through a distributed procedure, which is consistent with the new radio synthesis arrays where the full observing bandwidth is divided into multiple frequency channels. Numerical simulations reveal that the proposed robust distributed calibration estimator outperforms the conventional non-robust algorithm and/or the mono-frequency case.
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Communication dans un congrès
2018 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Apr 2018, Calgary, Canada. 〈10.1109/icassp.2018.8461382 〉
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https://hal-centralesupelec.archives-ouvertes.fr/hal-01851033
Contributeur : Remy Boyer <>
Soumis le : samedi 28 juillet 2018 - 20:33:15
Dernière modification le : mercredi 21 novembre 2018 - 12:21:20
Document(s) archivé(s) le : lundi 29 octobre 2018 - 12:22:50

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V Ollier, M N El Korso, A Ferrari, Remy Boyer, P Larzabal. Robust calibration of radio interferometers in multi-frequency scenario. 2018 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Apr 2018, Calgary, Canada. 〈10.1109/icassp.2018.8461382 〉. 〈hal-01851033〉

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