Wide field imaging for the square kilometre array

T. J. Cornwell; M. A. Voronkov; B. Humphreys

doi:10.1117/12.929336

19 October 2012 Wide field imaging for the square kilometre array

T. J. Cornwell, M. A. Voronkov, B. Humphreys

Proceedings Volume 8500, Image Reconstruction from Incomplete Data VII; 85000L (2012) https://doi.org/10.1117/12.929336
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

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.

Citation Download Citation

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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