Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914507h&link_type=abstract
American Astronomical Society, AAS Meeting #219, #145.07
Astronomy and Astrophysics
Astronomy
Scientific paper
The goal of RFI excision is to retain the sky signal of interest by subtracting out the interfering signal, rather than flagging it as unusable. In theory, matrix-decomposition techniques on the observed visibilities can be used to separate sky signal from ground RFI signal. Starting from first principles, the goal of this presentation is to illustrate how certain methods perform in ideal simulated situations, so that in the future one can complicate and build upon the methods presented here to predict how they would perform on real data. Tests were performed on simulated sky models made of bright and faint point and extended emission with terrestrial RFI that was either stationary or moving with respect to the telescope. Accuracy of the excision was determined by a statistical comparison of an ideal image with the result image and by the ability to determine the physical location of the RFI from the excised phase information. The results show that eigendecomposition and singular value decomposition of visibility matrices are capable of separating and subtracting out RFI signal in ideal situations.
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