Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phdt.........7l&link_type=abstract
Thesis (PHD). HARVARD UNIVERSITY , Source DAI-B 59/05, p. 2247, Nov 1998, 145 pages.
Astronomy and Astrophysics
Astronomy
2
Radioastronomy, Beta, Extraterrestrial Intelligence
Scientific paper
The Billion-channel ExtraTerrestrial Assay (BETA) is a radioastronomical search for microwave beacons from intelligent civilizations. It searches the 1400-1720 MHz 'waterhole' region with 0.5 Hz resolution for narrow-band carriers. BETA incorporates several systems for terrestrial radio frequency interference mitigation: a terrestrial 'veto' feed, two sky feeds to detect sidereal motion, and adaptive filtering to reduce intermittent interference. The search has surveyed the entire sky from +60o to 30o declination twice and is starting a third. During this time it has sifted through ~101016 frequency bins, followed ~109 candidate features and archived 3500 of these which passed preliminary tests. No candidate has repeated or otherwise presents the assumed characteristics of an extraterrestrial intelligent origin.
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