Non-linear redundancy calibration

Visweshwar Ram Marthi* and Jayaram Chengalur
National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Ganeshkhind, Pune 411007, India

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A steepest descent based algorithm to obtain the gains of the antennas and the model visibilities of the observed sky, exploiting a redundant array geometry, is described, as relevant to the upgrade of the Ooty Radio Telescope. Simulations establish that the estimator is statistically ecient.

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Keywords : methods: numerical – methods: statistical – techniques: interferometric