Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986inns.iafct....w&link_type=abstract
IAF, International Astronautical Congress, 37th, Innsbruck, Austria, Oct. 4-11, 1986. 4 p.
Astronomy and Astrophysics
Astronomy
Digital Filters, Electromagnetic Interference, Interference Immunity, Interferometers, Project Seti, Bandwidth, Doppler Effect, Sky Surveys (Astronomy)
Scientific paper
One of the many advantages offered by a multiplying interferometer for SETI is its inherent insensitivity to interference. Celestial signals arriving at the two antennas of an interferometer experience a differential Doppler shift due to the earth's rotation. When this is removed in the product of the two antenna outputs for the celestial source, interfering signals coming from sources fixed on the ground or from artificial satellites moving with respect to the stars are observed to be multiplied by a sinusoid oscillating in time. This modulation of the interference permits its identification and removal. Removal requires the use of synchronous detection in the search for CW, drifting CW, or quasi-periodic pulses. Interference reduction by at least 20 db is practical for both targeted searches and all sky surveys.
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