Array Signal Processing for Radio Astronomy

Details Array Signal Processing for Radio Astronomy Array Signal Processing for Radio Astronomy

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004exa....17..231v&link_type=abstract

Experimental Astronomy, Volume 17, Issue 1-3, pp. 231-249

Astronomy and Astrophysics

Astronomy

5

Array Signal Processing, Interference Mitigation, Radio Astronomy

Scientific paper

Radio astronomy forms an interesting application area for array signal processing techniques. Current synthesis imaging telescopes consist of a small number of identical dishes, which track a fixed patch in the sky and produce estimates of the time-varying spatial covariance matrix. The observations sometimes are distorted by interference, e.g., from radio, TV, radar or satellite transmissions. We describe some of the tools that array signal processing offers to filter out the interference, based on eigenvalue decompositions and factor analysis, which is a more general technique applicable to partially calibrated arrays. We consider detection of interference, spatial filtering techniques using projections, and discuss how a reference antenna pointed at the interferer can improve the performance. We also consider image formation and its relation to beamforming.

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