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Paper: Homography-Based Correction of Positional Errors in MRT Survey
Volume: 407, The Low-Frequency Radio Universe
Page: 426
Authors: Nayak, A.; Daiboo, S.; Udaya Shankar, N.
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.
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