The advantage of multiple telescopes for SETI

Details The advantage of multiple telescopes for SETI The advantage of multiple telescopes for SETI

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rome.iafcq....w&link_type=abstract

International Astronautical Federation, International Astronautical Congress, 32nd, Rome, Italy, Sept. 6-12, 1981, 9 p.

Astronomy and Astrophysics

Astronomy

Antenna Arrays, Interferometry, Project Seti, Radio Astronomy, Radio Frequency Interference, Low Pass Filters, Signal Processing, Spectrometers

Scientific paper

Combining the outputs of several antennas simultaneously, which are oriented toward the same direction in the sky, offers important advantages for SETI. The pattern of such an array has principle maxima which are very narrow. Because the ETI signal is expected from a single direction, the array is a good match to the signal. There are a number of possible advantages: (1) if the signal processing is by multiplication, there is strong RFI rejection; (2) signals coming from any direction within the diffraction beam of the largest telescope will be detected at the same time that the array provides direction finding information on an angular scale of the ratio of wavelength to the largest telescope separation; (3) multiplying systems, especially, enjoy good time-baseline stability, facilitating the detection of weak signals; (4) the availability of interference fringe phase offers an unbiased estimator for weak signals; (5) the strong rejection of RFI implies that a minimum of time is wasted in the follow-up of false alarms; and (6) the addition of more collecting area increases the sensitivity of the search.

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