Statistics of 'excess' observatory noise at the Nancay telescope and elsewhere

Details Statistics of 'excess' observatory noise at the Nancay telescope and elsewhere Statistics of 'excess' observatory noise at the Nancay telescope and elsewhere

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985stoc.iafcq....t&link_type=abstract

IAF, International Astronautical Congress, 36th, Stockholm, Sweden, Oct. 7-12, 1985. 9 p.

Astronomy and Astrophysics

Astronomy

Project Seti, Signal To Noise Ratios, Telescopes, White Noise, Analog To Digital Converters, Autocorrelation, Data Acquisition, Intermediate Frequencies, Linear Polarization, Power Spectra, Radio Frequencies, Stellar Spectra, Video Signals

Scientific paper

The need to consider noise in the detection of possible extraterrestrial intelligence signals is examined. In this experiment 140 stars are observed in the declination ranges -38 deg to -15 deg and +39 deg to +90 deg. The functions of the equipment utilized at the Nancay Observatory, which included an eight level autocorrelator, a programmable oscillator, and computers, are described. The equations required to calculate a detection threshold are provided. The results reveal that an excessive number of stars exceeded the threshold; it is concluded that the analog and digital equipment within the observatory produces a non-Gaussian noise distribution and reduces sensitivity. Various methods of excising this discrete noise are investigated.

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