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19 October 2012 Wide field imaging for the square kilometre array
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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.
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T. J. Cornwell, M. A. Voronkov, and B. Humphreys "Wide field imaging for the square kilometre array", Proc. SPIE 8500, Image Reconstruction from Incomplete Data VII, 85000L (19 October 2012); https://doi.org/10.1117/12.929336
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