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Proceedings Paper

Wide field imaging for the square kilometre array
Author(s): T. J. Cornwell; M. A. Voronkov; B. Humphreys
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Paper Abstract

Wide-field radio interferometric telescopes such as the Square Kilometre Array now being designed are subject to a number of aberrations. One particularly pernicious aberration is that due to non-coplanar baselines whereby long baselines incur a quadratic image-plane phase error. There are numerous algorithms for dealing with the non-coplanar baselines effect. As a result of our experience with developing processing software for the Australian Square Kilometre Array Pathinder, we advocate the use of a hybrid algorithm, called w snapshots, based on a combination of w projection and snapshot imaging. This hybrid overcomes some of the deficiencies of each and has advantages from both. Compared to pure w projection, w snapshots uses less memory and execution time, and compared to pure snapshot imaging, w snapshots uses less memory and is more accurate. At the asymptotes, w snapshots devolves to w projection and to snapshots.

Paper Details

Date Published: 19 October 2012
PDF: 12 pages
Proc. SPIE 8500, Image Reconstruction from Incomplete Data VII, 85000L (19 October 2012); doi: 10.1117/12.929336
Show Author Affiliations
T. J. Cornwell, Commonwealth Scientific and Industrial Research Organisation (Australia)
M. A. Voronkov, Commonwealth Scientific and Industrial Research Organisation (Australia)
B. Humphreys, Commonwealth Scientific and Industrial Research Organisation (Australia)


Published in SPIE Proceedings Vol. 8500:
Image Reconstruction from Incomplete Data VII
Philip J. Bones; Michael A. Fiddy; Rick P. Millane, Editor(s)

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