What question did this study set out to answer?

To establish mathematical limits on coherent integration time in very-long-baseline interferometry based on the performance of frequency standards.

December 1, 1981IEEE Transactions on Instrumentation and Measurement

Coherence limits for very-long-baseline interferometry

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Authors

ARA. E. E. RogersSouthern Illinois University Carbondale JMJ. M. MoranWoodwell Climate Research Center

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Implication

Theoretical modeling reveals coherence limits in very-long-baseline interferometers, suggesting that atmospheric fluctuations constrain high-precision geodetic measurements.

Key Points

To establish mathematical limits on coherent integration time in very-long-baseline interferometry based on the performance of frequency standards.
Derived analytical formulas linking interferometer coherence to the Allan variance of local frequency standards.
Evaluated noise cancellation mechanisms using differential interferometry configurations.
Assessed environmental phase noise contributions from atmospheric and ionospheric fluctuations.
Clock instabilities in local frequency standards inherently constrain coherent integration time and geodetic measurement accuracy unless mitigated by differential interferometry.
Interferometers operating with ultra-stable frequency standards like hydrogen masers encounter fundamental coherence boundaries dominated by atmospheric and ionospheric phase noise.

Cite This Study

Rogers et al. (1981) studied this question.

synapsesocial.com/papers/6a711cd6a7fbea1e44084fb5 https://doi.org/10.1109/tim.1981.6312409

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Implication

Theoretical modeling reveals coherence limits in very-long-baseline interferometers, suggesting that atmospheric fluctuations constrain high-precision geodetic measurements.

Coherence limits for very-long-baseline interferometry

Discussion

Member takes

Implication

Key Points

Cite This Study

Coherence limits for very-long-baseline interferometry

Discussion

Member takes

Implication

Key Points

Cite This Study

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