Efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: An A-stacking framework
Artikel i vetenskaplig tidskrift, 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

Författare

A. Young

Universiteit Stellenbosch

S. J. Wijnholds

Netherlands Institute for Radio Astronomy (ASTRON)

Tobia Carozzi

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

Rob Maaskant

Chalmers, Signaler och system, Kommunikations- och antennsystem, Antennsystem

Marianna Ivashina

Chalmers, Signaler och system, Kommunikations- och antennsystem, Antennsystem

D. B. Davidson

Universiteit Stellenbosch

Astronomy and Astrophysics

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

Vol. 577 Art. no. A56- A56

Ämneskategorier

Fusion, plasma och rymdfysik

DOI

10.1051/0004-6361/201425492

Mer information

Senast uppdaterat

2018-04-03