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

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    Fulltext not available
    Authors
    Young, A.
    Wijnholds, S.
    Carozzi, T.
    Maaskant, R.
    Ivashina, M.
    Davidson, David
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Young, A. and Wijnholds, S. and Carozzi, T. and Maaskant, R. and Ivashina, M. and Davidson, D. 2015. Efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: An A-stacking framework. Astronomy and Astrophysics. 577.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361/201425492
    ISSN
    0004-6361
    School
    Curtin Institute of Radio Astronomy (Engineering)
    URI
    http://hdl.handle.net/20.500.11937/71936
    Collection
    • Curtin Research Publications
    Abstract

    © 2015 ESO. 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 ofa 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.

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