Multichannel interference mitigation methods in radio astronomy

Details Multichannel interference mitigation methods in radio astronomy Multichannel interference mitigation methods in radio astronomy

2000-05-17

arxiv.org/abs/astro-ph/0005359v1

Astronomy and Astrophysics

Astrophysics

39 pages, 18 figures.Enhanced figures can be downloaded from http://cas.et.tudelft.nl/~leshem/postscripts/leshem/figs34567.ps.

Scientific paper

10.1086/317360

Radio-astronomical observations are increasingly corrupted by RF interference, and online detection and filtering algorithms are becoming essential. To facilitate the introduction of such techniques into radio astronomy, we formulate the astronomical problem in an array signal processing language, and give an introduction to some elementary algorithms from that field. We consider two topics in detail: interference detection by rank estimation of short-term covariance matrices, and spatial filtering by subspace estimation and projection. We discuss experimental data collected at the Westerbork radio telescope, and illustrate the effectiveness of the space-time detection and blanking process on the recovery of a 3C48 absorption line in the presence of GSM mobile telephony interference.

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