The First GPS IERS and Geodynamics Experiment — 1991
Over 120 GPS receivers were deployed from January 22 to February 13, 1991 through a collaboration of about 70 agencies; this campaign was the first IERS (International Earth Rotation Service) experiment involving the GPS. Although earlier global tracking experiments have been undertaken (GOTEX, CASA UNO), the global distribution and concomitant geometric strength of the tracking sites in the GIG’91 campaign were unprecedented. Consequently, GIG’91 should yield significant advances in our understanding of the inherent accuracy of the GPS as a space geodetic system, as well as its strengths and limitations. The overall goal of the GIG’91 experiment was to obtain a high quality data set to be used to assess the utility of the GPS in the mix of space techniques currently used by the IERS for Earth Orientation monitoring and terrestrial reference frame control. The primary objectives of the campaign were, 1) to obtain an extensive and complete set of GPS observations from a global network with world-wide distribution, and 2) to encourage the broad participation by many groups internationally in the campaign and in the subsequent data analysis and assessment activities. The second objective resulted in a wide diversity of equipment used in the campaign. The 120-plus receivers in GIG’91 included 12 different receiver models and an even larger number of different antenna systems. Nevertheless, this problem of mixing systems should be mitigated significantly by the commonality in many of the systems used, the application of known offsets for certain combinations of mixed systems, and the standardization in data-taking and logging procedures that were mostly followed in GIG’91.
KeywordsAmbiguity Resolution Earth Rotation Terrestrial Reference Frame Tracking Network Earth Rotation Parameter
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