GPS measurements of the baseline between Quincy and Platform Harvest

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Abstract
As part of TOPEX altimeter verification, the global positioning system has been used to measure the baseline between the verification site at oil Platform Harvest and a GPS antenna collocated with the satellite laser ranging site at Quincy, California. Data from Harvest, Quincy, and a global network of stations, collected between September 25, 1992 and December 17, 1993, have been analyzed to obtain 272 single‐day estimates of the baseline. These daily estimates have in turn been fitted with a linear model, yielding a single estimate of the baseline and its rate of change. Changes in the horizontal components of the baseline reflect the relative tectonic motion of the Pacific plate and the Sierra Nevadan microplate, along with local motion at Harvest and Quincy. The vertical component, crucial to verification, is determined with millimeter‐level accuracy and shows no significant variation during the measurement interval.

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