Using multiple beams to identify radio frequency interference in the search for extraterrestrial intelligence

Details Using multiple beams to identify radio frequency interference in the search for extraterrestrial intelligence Using multiple beams to identify radio frequency interference in the search for extraterrestrial intelligence

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005rasc...40.5s18h&link_type=abstract

Radio Science, Volume 40, Issue 5, CiteID RS5S18

Astronomy and Astrophysics

Astrophysics

Radio Science: Electromagnetic Noise And Interference, Radio Science: Interferometry (1207, 1209, 1242), Solar Physics, Astrophysics, And Astronomy: Instruments And Techniques, Electromagnetics: Antenna Arrays

Scientific paper

The Allen Telescope Array (ATA) is a multiuser instrument and will perform simultaneous radio astronomy and radio search for extraterrestrial intelligence (SETI) observations. It is a multibeam instrument, with 16 independently steerable dual-polarization beams at four different tunings. Here we describe a new method for identifying radio frequency interference (RFI) that leverages the unique attributes of the ATA. Given four beams at one tuning, it is possible to distinguish RFI from true ETI signals by pointing the beams in different directions. Any signal that appears in more than one beam can be identified as RFI and ignored. We discuss the effectiveness of this approach using realistic simulations of the fully populated 350 element configuration of the ATA as well as the interim 32 element configuration. Over a 5 min integration period, we find RFI rejection ratios exceeding 50 dB over most of the sky.

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