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Paper: W Projection: A New Algorithm for Wide Field Imaging with Radio Synthesis Arrays
Volume: 347, Astronomical Data Analysis Software and Systems XIV
Page: 86
Authors: Cornwell, T.J.; Golap, K.; Bhatnagar, S.
Abstract: We present a novel interpretation of the non-coplanar baselines effect in synthesis radio telescopes as being due to differential Fresnel diffraction in the neighborhood of the array antennas, and a new algorithm to deal with this effect. Our new algorithm, which we call “w projection”, has markedly superior performance compared to existing algorithms. At roughly equivalent levels of accuracy, w-projection can be up to an order of magnitude faster than the corresponding facet-based algorithms.
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