-stacking -projection hybrid algorithm for wide-field interferometric imaging: implementation details and improvements
arXiv:1903.06555 · doi:10.1017/pasa.2020.28
Abstract
We present a detailed discussion of the implementation strategies for a recently developed -stacking -projection hybrid algorithm used to reconstruct wide-field interferometric images. In particular, we discuss the methodology used to deploy the algorithm efficiently on a supercomputer via use of a Message Passing Interface (MPI) -means clustering technique to achieve efficient construction and application of non co-planar effects. Additionally, we show that the use of conjugate symmetry increases the algorithms performance by imaging an interferometric observation of Fornax A from the Murchison Widefield Array (MWA). We perform exact non-coplanar wide-field correction for 126.6 million visibilities using 50 nodes of a computing cluster. The -projection kernel construction takes only 15 minutes, demonstrating that the implementation is both fast and efficient.
10 Pages, 2 Figures. arXiv admin note: text overlap with arXiv:1807.09239
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