Efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: An A-stacking framework
Journal article, 2015

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.

methods: analytical

techniques: image processing

methods: numerical

Author

A. Young

Stellenbosch University

S. J. Wijnholds

Netherlands Institute for Radio Astronomy (ASTRON)

Tobia Carozzi

Chalmers, Earth and Space Sciences, Onsala Space Observatory

Rob Maaskant

Chalmers, Signals and Systems, Communication and Antenna Systems, Antennas

Marianna Ivashina

Chalmers, Signals and Systems, Communication and Antenna Systems, Antennas

D. B. Davidson

Stellenbosch University

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 577 Art. no. A56- A56

Subject Categories

Fusion, Plasma and Space Physics

DOI

10.1051/0004-6361/201425492

More information

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4/3/2018 3