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Precision geodesy using the Mark-III very-long-baseline interferometer systemVery-long-baseline interferometry (VLBI) has been used to make precise measurements of the vector separation between widely separated antennas. The system for acquiring and processing VLBI data known as Mark-III is described. Tests of the system show it to have millimeter-level accuracy on short baselines; measurements of baselines longer than a few hundred kilometers suggest that accuracy is limited by the uncertainty in the calibration of tropospheric path delay to the level of a few centimeters. VLBI experiments conducted between 1976 and 1983 have demonstrated the stability of the North American plate by showing that there is no change in the distance between eastern California and Massachusetts at the level of a few millimeters per year or greater. Experiments made from 1980 to 1984 indicate that the distance from Massachusetts to Sweden is increasing by 1.7 + or - 1 cm/year where the quoted standard deviation includes the estimated effects of systematic errors.
Document ID
19850060309
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Clark, T. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Corey, B. E.
(Haystack Observatory Westford, MA, United States)
Davis, J. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Herring, T. A.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Elgered, G.
(Chalmers Tekniska Hogskola Goteborg, Sweden)
Date Acquired
August 12, 2013
Publication Date
July 1, 1985
Publication Information
Publication: IEEE Transactions on Geoscience and Remote Sensing
Volume: GE-23
ISSN: 0196-2892
Subject Category
Geophysics
Accession Number
85A42460
Funding Number(s)
CONTRACT_GRANT: F19628-83-K-0031
CONTRACT_GRANT: NSF EAR-83-02221
CONTRACT_GRANT: NSF EAR-83-06380
CONTRACT_GRANT: NAS5-26635
CONTRACT_GRANT: NAS5-27571
Distribution Limits
Public
Copyright
Other

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