W Projection: A New Algorithm for Wide Field Imaging with Radio Synthesis Arrays

Details W Projection: A New Algorithm for Wide Field Imaging with Radio Synthesis Arrays W Projection: A New Algorithm for Wide Field Imaging with Radio Synthesis Arrays

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..347...86c&link_type=abstract

Astronomical Data Analysis Software and Systems XIV ASP Conference Series, Vol. 347, Proceedings of the Conference held 24-27 Oc

Computer Science

Performance

6

Scientific paper

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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