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In radio astronomy, accurate calibration is of crucial importance for the newgeneration of radio interferometers. More specifically, because of thepotential presence of outliers which affect the measured data, robustness needsto be ensured. On the other hand, calibration is improved by taking advantageof these new instruments and exploiting the known structure of parameters ofinterest across frequency. Therefore, we propose in this paper an iterativerobust multi-frequency calibration algorithm based on a distributed andconsensus optimization scheme which aims to estimate the complex gains of thereceivers and the directional perturbations caused by the ionosphere. Numericalsimulations reveal that the proposed distributed calibration techniqueoutperforms the conventional non-robust algorithm and per-channel calibration.

Robust distributed calibration of radio interferometers with direction dependent distortions