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Efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: An A-stacking framework

A. Young ; S. J. Wijnholds ; Tobia Carozzi (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Rob Maaskant (Institutionen för signaler och system, Antennsystem) ; Marianna Ivashina (Institutionen för signaler och system, Antennsystem) ; D. B. Davidson
Astronomy and Astrophysics (0004-6361). Vol. 577 (2015), p. Art. no. A56.
[Artikel, refereegranskad vetenskaplig]

A general framework is presented for modeling direction-dependent effects that are also baseline-dependent, as part of the calibration and imaging process. Within this framework such effects are represented as a parametric linear model in which basis functions account for direction dependence, whereas expansion coefficients account for the baseline dependence. This separation enables the use of a multiple fast Fourier transform-based implementation of the forward calculation (sky to visibility) in a manner similar to the W-stacking solution for non-coplanar baselines, and offers a potential improvement in computational efficiency in scenarios where the gridding operation in a convolution-based approach to direction-dependent effects may be too costly. Two novel imaging approaches that are possible within this framework are also presented.

Nyckelord: methods: analytical, methods: numerical, techniques: image processing



Denna post skapades 2015-08-07. Senast ändrad 2016-08-22.
CPL Pubid: 220362

 

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