Abstract
view Abstract Citations (86) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Interstellar Scattering Effects on the Detection of Narrow-Band Signals Cordes, James M. ; Lazio, T. J. Abstract The detection and decoding of narrow-band radio signals are investigated after propagation through the turbulent, ionized interstellar medium. For most lines of sight through the Galaxy, spectral broadening due to scattering below about 0.1 Hz at 1 GHz occurs. Spectral broadening is therefore unimportant for the detection of hypothesized signals from extraterrestrial intelligence. Intensity scintillations, however, are of considerable importance. They both help and hinder detection: signals too weak to be detected without the scattering medium may be modulated above the detection threshold while, conversely, signals above threshold can be modulated below. In strong scattering (distances above about 100 pc at 1 GHz), multiple observations of a given target comprise a strategy that is superior to single observations even when the total time per target is held fixed. Decoding information carrying signals may encounter difficulties due to intensity scintillations. Publication: The Astrophysical Journal Pub Date: July 1991 DOI: 10.1086/170261 Bibcode: 1991ApJ...376..123C Keywords: Interstellar Matter; Narrowband; Radio Scattering; Radio Sources (Astronomy); Radio Transmission; Bandwidth; Line Of Sight; Milky Way Galaxy; Pulsars; Spectral Line Width; Astrophysics; INTERSTELLAR: MATTER; LINE PROFILES; RADIO SOURCES: LINES full text sources ADS | data products SIMBAD (3)
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