Parallel Calibration for Sensor Array Radio Interferometers
Abstract
In order to meet the theoretically achievable imaging performance, calibration of modern radio interferometers is a mandatory challenge, especially at low frequencies. In this perspective, we propose a novel parallel iterative multi-wavelength calibration algorithm. The proposed algorithm estimates the apparent directions of the calibration sources, the directional and undirectional complex gains of the array elements and their noise powers, with a reasonable computational complexity. Furthermore, the algorithm takes into account the specific variation of the aforementioned parameter values across wavelength. Realistic numerical simulations reveal that the proposed scheme outperforms the mono-wavelength calibration scheme and approaches the derived constrained Cram\'er-Rao bound even with the presence of non-calibration sources at unknown directions, in a computationally efficient manner.
Cite
@article{arxiv.1609.02448,
title = {Parallel Calibration for Sensor Array Radio Interferometers},
author = {Martin Brossard and Mohammed Nabil El Korso and Marius Pesavento and Rémy Boyer and Pascal Larzabal and Stefan J. Wijnholds},
journal= {arXiv preprint arXiv:1609.02448},
year = {2016}
}