Volume 627, July 2019
|Number of page(s)||12|
|Section||Numerical methods and codes|
|Published online||12 July 2019|
Unified radio interferometric calibration and imaging with joint uncertainty quantification
Max-Planck Institut für Astrophysik, Karl-Schwarzschild-Str. 1, Garching, Germany
2 Ludwig-Maximilians-Universität München (LMU), Geschwister-Scholl-Platz 1, München, Germany
3 Technische Universität München (TUM), Boltzmannstr. 3, 85748 Garching, Germany
Accepted: 6 June 2019
The data reduction procedure for radio interferometers can be viewed as a combined calibration and imaging problem. We present an algorithm that unifies cross-calibration, self-calibration, and imaging. Because it is a Bayesian method, this algorithm not only calculates an estimate of the sky brightness distribution, but also provides an estimate of the joint uncertainty which entails both the uncertainty of the calibration and that of the actual observation. The algorithm is formulated in the language of information field theory and uses Metric Gaussian Variational Inference (MGVI) as the underlying statistical method. So far only direction-independent antenna-based calibration is considered. This restriction may be released in future work. An implementation of the algorithm is contributed as well.
Key words: techniques: interferometric / methods: statistical / methods: data analysis / instrumentation: interferometers
© P. Arras et al. 2019
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Open Access funding provided by Max Planck Society.
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