Coherence limits for very-long-baseline interferometry

Details Coherence limits for very-long-baseline interferometry Coherence limits for very-long-baseline interferometry

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981itim...30..283r&link_type=abstract

IEEE Transactions on Instrumentation and Measurement, vol. IM-30, Dec. 1981, p. 283-286.

Physics

19

Frequency Stability, Frequency Standards, Instrument Errors, Phase Coherence, Very Long Base Interferometry, Atmospheric Effects, Atomic Clocks, Gas Masers, Hydrogen, Standard Deviation, Turbulence Effects

Scientific paper

The quality of the frequency standards used in very-long-baseline interferometry (VBLI) limits the coherent integration time and the accuracy of geodetic experiments except in special cases when clock instabilities can be made to cancel out by using differential interferometry. Formulas are derived for estimating the coherence of these interferometers from the Allan variances of the frequency standards. Experiments using extremely high-quality frequency standards, such as hydrogen masers, may be limited by the phase noise that results from atmospheric and ionospheric fluctuations.

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