Abstract
Major changes in the Cooperative International GPS Network (CIGNET) tracking hardware took place in 1989. Prior to 1989, the CIGNET solely consisted of TI-4100 receivers except for the Mini-Mac receiver at Tsukuba. In January, 1989, the National Geodetic Survey (NGS) installed Mini-Mac 2816AT receivers at Mojave, Westford and Richmond which, with the Tsukuba receiver, brought the network to an almost equal number of TI and Mini-Mac receivers. Simultaneous operations of TI and Mini-Mac receivers were conducted by the NGS at the three U.S. sites for a period of several weeks. Using this simultaneous data set in addition to the other CIGNET data, an investigation has been conducted into the compatibility of the all-TI and the mixed receiver configuration. The preliminary results have verified the existence of a 1 ms time tag discrepancy in the Mini-Mac data reported by others, however, a 2.5 cm unresolved discrepancy was found on the short TI to Mini-Mac baseline at Mojave. When the discrepancy in GPS time was corrected, several meter RMS orbit differences were found; however, the 1400 km test baseline between Onsala and Tromso demonstrated less than two parts in 108 agreement between the two cases. The results also demonstrated the existence of a change in Tromso antenna position from the location previously reported.
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© 1990 Springer-Verlag New York Inc.
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Schutz, B.E., Abusali, P.A.M., Ho, C.S., Tapley, B.D. (1990). GPS Orbits and Baseline Experiments: Mini-Mac/TI Comparisons. In: Bock, Y., Leppard, N. (eds) Global Positioning System: An Overview. International Association of Geodesy Symposia, vol 102. Springer, New York, NY. https://doi.org/10.1007/978-1-4615-7111-7_17
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DOI: https://doi.org/10.1007/978-1-4615-7111-7_17
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