Coherence limits in VLBI observations at 3-millimeter wavelength

Details Coherence limits in VLBI observations at 3-millimeter wavelength Coherence limits in VLBI observations at 3-millimeter wavelength

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984rasc...19.1552r&link_type=abstract

Radio Science (ISSN 0048-6604), vol. 19, Nov.-Dec. 1984, p. 1552-1560. NSF-supported research.

Astronomy and Astrophysics

Astronomy

23

Millimeter Waves, Phase Coherence, Radio Observation, Signal To Noise Ratios, Very Long Base Interferometry, Frequency Standards, Hydrogen Masers, Phase Error, Radio Astronomy, Systems Stability

Scientific paper

Very long baseline interferometry (VLBI) experiments at a frequency of 89 GHz (3.4-mm wavelength) using hydrogen maser frequency standards show that under good atmospheric conditions coherence can be maintained for times up to 700 s, corresponding to an Allan standard deviation of approximately 10 to the -14th. The stability appears to be largely limited by the phase noise resulting from fluctuations in delay through the troposphere. Methods of estimating the interferometer fringe amplitudes and closure phases in the presence of large phase fluctuations are examined. The spectrum and the Allan standard deviation of the observed phase fluctuations are derived.

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