Efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: An A-stacking framework
© 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 depen...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Published: |
EDP Sciences
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/71936 |
| _version_ | 1848762614758244352 |
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| author | Young, A. Wijnholds, S. Carozzi, T. Maaskant, R. Ivashina, M. Davidson, David |
| author_facet | Young, A. Wijnholds, S. Carozzi, T. Maaskant, R. Ivashina, M. Davidson, David |
| author_sort | Young, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 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. |
| first_indexed | 2025-11-14T10:50:22Z |
| format | Journal Article |
| id | curtin-20.500.11937-71936 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:50:22Z |
| publishDate | 2015 |
| publisher | EDP Sciences |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-719362018-12-13T09:33:30Z Efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: An A-stacking framework Young, A. Wijnholds, S. Carozzi, T. Maaskant, R. Ivashina, M. Davidson, David © 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. 2015 Journal Article http://hdl.handle.net/20.500.11937/71936 10.1051/0004-6361/201425492 EDP Sciences restricted |
| spellingShingle | Young, A. Wijnholds, S. Carozzi, T. Maaskant, R. Ivashina, M. Davidson, David Efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: An A-stacking framework |
| title | Efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: An A-stacking framework |
| title_full | Efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: An A-stacking framework |
| title_fullStr | Efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: An A-stacking framework |
| title_full_unstemmed | Efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: An A-stacking framework |
| title_short | Efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: An A-stacking framework |
| title_sort | efficient correction for both direction-dependent and baseline-dependent effects in interferometric imaging: an a-stacking framework |
| url | http://hdl.handle.net/20.500.11937/71936 |