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The extended tracking network and indications of baseline precision and accuracy in the North AndesThe CASA Uno Global Positioning System (GPS) experiment (January-February 1988) included an extended tracking network which covered three continents in addition to the network of scientific interest in Central and South America. The repeatability of long baselines (400-1000 km) in South America is improved by up to a factor of two in the horizontal vector baseline components by using tracking stations in the Pacific and Europe to supplement stations in North America. In every case but one, the differences between the mean solutions obtained using different tracking networks was equal to or smaller than day-to-day rms repeatabilities for the same baselines. The mean solutions obtained by using tracking stations in North America and the Pacific agreed at the 2-3 millimeter level with those using tracking stations in North America and Europe. The agreement of the extended tracking network solutions suggests that a broad distribution of tracking stations provides better geometric constraints on the satellite orbits and that solutions are not sensitive to changes in tracking network configuration when an extended network is use. A comparison of the results from the North Andes and a baseline in North America suggests that the use of a geometrically strong extended tracking network is most important when the network of interest is far from North America.
Document ID
19900040324
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Freymueller, Jeffrey T.
(South Carolina Univ. Columbia, SC, United States)
Kellogg, James N.
(South Carolina, University Columbia, United States)
Date Acquired
August 14, 2013
Publication Date
March 1, 1990
Publication Information
Publication: Geophysical Research Letters
Volume: 17
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
90A27379
Funding Number(s)
CONTRACT_GRANT: NSF EAR-86-17485
Distribution Limits
Public
Copyright
Other

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