Multichannel interference mitigation techniques in radio astronomy

Amir Leshem*, Alle Jan Van Der Veen, Albert Jan Boonstra

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

Radio-astronomical observations are increasingly corrupted by radio frequency interference, and on-line 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 Synthesis Radio Telescope and illustrate the effectiveness of the spacetime detection and blanking process on the recovery of a 3C 48 absorption line in the presence of GSM mobile telephony interference.

Original languageAmerican English
Pages (from-to)355-373
Number of pages19
JournalAstrophysical Journal, Supplement Series
Volume131
Issue number1
DOIs
StatePublished - Nov 2000
Externally publishedYes

Keywords

  • Instrumentation: interferometers
  • Methods: analytical
  • Methods: statistical

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