A CALIBRATION OF GPS EQUIPMENT IN JAPAN

M. Weiss, D. Davis

Abstract:	With the development of common view time comparisons using GPS satellites the Japanese time and frequency standards laboratories have been able to contribute with more weight to the International unification of time under the coordination of the Bureau International de Poids et Measures (BIPM). During the period from June 1 through June 11, 1988, the differential delays of time transfer receivers of the Global Positioning System (GPS) were calibrated at three different laboratories in Japan, linking them for absolute time transfer with previously calibrated labs of Europe and North America. The differential delay between two receivers was first calibrated at the National Institute of Standards and Technology (NIST, formerly the National Bureau of Standards) in Boulder, Colorado, USA. Then one of these receivers was carried to each of the three laboratories: the Tokyo Astronomical Observatory (TAO), the Communications Research Laboratory (CRL), both in Tokyo, and the National Research Laboratory of Metrology (NRLM) in Tsukuba City. At each lab data was taken comparing receivers. Finally the traveling receiver was taken back to NIST for closure of the calibration. On the way back the GPS receiver at the WWVH radio station of NIST in Hawaii was also calibrated. We report here the results of this calibration trip, along with some interesting problems that developed concerning this technique.
Published in:	Proceedings of the 20th Annual Precise Time and Time Interval Systems and Applications Meeting November 29 - 1, 1988 Sheraton Premiere Hotel Vienna, Virginia
Pages:	101 - 110
Cite this article:	Weiss, M., Davis, D., "A CALIBRATION OF GPS EQUIPMENT IN JAPAN," Proceedings of the 20th Annual Precise Time and Time Interval Systems and Applications Meeting, Vienna, Virginia, November 1988, pp. 101-110.
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