Title:	Homography-based correction of positional errors in MRT survey
Authors:	Nayak, Arvind Daiboo, Soobash Udaya Shankar, N.
Issue Date:	Sep-2009
Publisher:	Astronomical Society of the Pacific
Citation:	ASP Conference Series, 2009, Vol.407, p426
Abstract:	The Mauritius Radio Telescope (MRT) images show systematics in the positional errors of sources when compared to source positions in the Molonglo Reference Catalogue (MRC). We have applied two-dimensional homography to correct positional errors in the image domain and avoid re-processing the visibility data. Positions of bright (above 15 σ) sources, common to MRT and MRC catalogues, are used to set up an over-determined system to solve for the 2-D homography matrix. After correction, the errors are found to be within 10% of the beamwidth for these bright sources and the systematics are eliminated from the images.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/4143
Alternative Location:	http://adsabs.harvard.edu/abs/2009ASPC..407..426N http://arxiv.org/abs/0905.0880
Copyright:	2009 Astronomical Society of the Pacific.
Additional information:	Proceedings of the conference held 8-12 December 2008, at National Centre for Radio Astrophysics (NCRA), TIFR, Pune, India. Edited by D. J. Saikia, D. A. Green, Y. Gupta, and T. Venturi. San Francisco: Astronomical Society of the Pacific.
Appears in Collections:	Research Papers (A&A)

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