Computer Science – Information Theory
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976anah.iafcq....m&link_type=abstract
International Astronautical Federation, International Astronautical Congress, 27th, Anaheim, Calif., Oct. 10-16, 1976, 7 p.
Computer Science
Information Theory
Extraterrestrial Life, Microwave Transmission, Nasa Programs, Radio Reception, Signal Analysis, Signal Detection, Systems Analysis, Drift (Instrumentation), Fourier Transformation, Frequency Modulation, Frequency Ranges, Information Theory, Pattern Recognition, Polarization (Waves), Radiant Flux Density, Signal To Noise Ratios
Scientific paper
The problem of receiving and identifying a single microwave signal transmitted by extraterrestrial intelligent beings is analyzed in the cases where the signal is designed to catch our attention and the signal is designed for internal purposes of another civilization. Six variables which yield uncertainty as to the exact signal which should be searched for are described: polarization, modulation, flux level, direction, frequency (including bandwidth and drift rate), and time. It is shown that if all reasonable variations of these parameters are to be examined sequentially for 1000 seconds, the search would take over a million times longer than the age of the Universe. Ways to simplify the search are considered, including widening the frequency bin, selecting specific targets, cutting the observation time, using a Fourier transform device for data processing, and building larger antennas as well as better low-noise receivers.
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