Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..643s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, April 1990, p. 643-646. Research supported by NASA and USGS.
Physics
10
Geodetic Surveys, Global Positioning System, Orbit Calculation, Very Long Base Interferometry, Central America, Geocentric Coordinates, Geodetic Accuracy, Laser Ranger/Tracker, South America, Stochastic Processes
Scientific paper
CASA Uno data from sites distributed in longitude from Australia to Europe have been used to determine orbits of the GPS satellites. The characteristics of the orbits determined from double difference phase have been evaluated through comparisons of two-week solutions with one-week solutions and by comparisons of predicted and estimated orbits. Evidence of unmodeled effects is demonstrated, particularly associated with the orbit planes that experience solar eclipse. The orbit accuracy has been assessed through the repeatability of unconstrained estimated baseline vectors ranging from 245 km to 5400 km. Both the baseline repeatability and the comparison with independent space geodetic methods give results at the level of 1-2 parts in 100,000,000. In addition, the Mojave/Owens Valley (245 km) and Kokee Park/Ft. Davis (5409 km) estimates agree with VLBI and SLR to better than 1 part in 100,000,000.
Abusali A. M. P.
Ho Chun-Sing
Schutz Bob E.
Tapley Byron D.
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