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The recognition of extraterrestrial artificial signalsConsiderations in the design of receivers for the detection and recognition of artificial microwave signals of extraterrestrial origin are discussed. Following a review of the objectives of SETI and the probable reception and detection characteristics of extraterrestrial signals, means for the improvement of the sensitivity, signal-to-noise ratios and on-line data processing capabilities of SETI receivers are indicated. The characteristics of the signals likely to be present at the output of an ultra-low-noise microwave receiver are then examined, including the system background noise, terrestrial radiations, astrophysical radiations, accidental artificial radiations of terrestrial origin, and intentional radiations produced by humans and by extraterrestrial intelligence. The classes of extraterrestrial signals likely to be detected, beacons and leakage signals, are considered, and options in the specification of gating and thresholding for a high-spectral resolution, high-time-resolution signal discriminator are indicated. Possible tests for the nonhuman origin of a received signal are also pointed out.
Document ID
19810042201
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Seeger, C. L.
(NASA Ames Research Center SETI Program Office, Moffett Field; San Francisco State University, San Francisco, Calif., United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1980
Subject Category
Space Sciences (General)
Meeting Information
Meeting: Asilomar Conference on Circuits, Systems, and Computers
Location: Pacific Grove, CA
Start Date: November 5, 1979
End Date: November 7, 1979
Accession Number
81A26605
Distribution Limits
Public
Copyright
Other

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