Preprint Article Version 1 NOT YET PEER-REVIEWED

The RadioAstron dedicated DiFX distribution

Version 1 : Received: 18 July 2016 / Approved: 19 July 2016 / Online: 19 July 2016 (04:54:57 CEST)

A peer-reviewed article of this Preprint also exists.

Bruni, G.; Anderson, J.M.; Alef, W.; Rottmann, H.; Lobanov, A.P.; Zensus, J.A. The RadioAstron Dedicated DiFX Distribution. Galaxies 2016, 4, 55. Bruni, G.; Anderson, J.M.; Alef, W.; Rottmann, H.; Lobanov, A.P.; Zensus, J.A. The RadioAstron Dedicated DiFX Distribution. Galaxies 2016, 4, 55.

Journal reference: Galaxies 2016, 4, 55
DOI: 10.3390/galaxies4040055

Abstract

DiFX is a software VLBI correlator currently adopted by several main correlation sites around the globe. After the launch of the RadioAstron Space-VLBI mission in 2011, an extension was necessary to handle processing of an orbiting antenna, to be correlated with supporting ground arrays. We present here a branch of the main DiFX distribution (2.4), recently uploaded on the publicly available repository, that MPIfR developed to process data of the three AGN-imaging RadioAstron key science projects. It can account for general relativistic correction of an orbiting antenna with variable position/velocity, providing a routine to covert the native RDF format to the more common M5B one. Also, a fringe-finding algorithm able to manage arbitrary large fringe-search window is included, allowing one to increase the search space normally adopted by common software packages like HOPS.

Subject Areas

VLBI; Space-VLBI; Correlation; RadioAstron; AGN

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