Long Term Time Comparison with GPS Receivers

Michito Imae, Makoto Uratsuka, Chihiro Miki, Takao Morikawa, Kosuke Akatsuka and Kazuyuki Yoshimura

Abstract:	The Radio Research Laboratory (RRL) has been making the international tine comparison since 1984 by using a GPS (Global Positioning System) time-transfer receiver which was developed by RRL (GTR-1). Time comparisons are made on a routine base between RRL and US/European organizations by the common-view method to contribute data of the atomic clocks and the primary frequency standard of RRL to the TAI. The time-transfer results between RRL and other time keeping organizations (international and domestic) via GPS using GTR-1 are presented. In the case of international tine-transfer, between RRL and USNO, the precision is about 20 ns for more than a few-day comparisons, and in the case of domestic time-transfer, between RRL and TAO, the precision is about 15 ns. The system noise is 1 - 2 x 10^-13/taul day) in both cases. The ionospheric effect on time-transfer via the GPS L1 signal was quantitatively estimated by using the total electron contests date measured at RRL. Instabilities due to the ionospheric effects are more than 2.6 x 10^-13/tau(day) during around solar maximum and about 8 x 10^-14 during solar minimum for the intercontinental time-transfers.
Published in:	Proceedings of the 17th Annual Precise Time and Time Interval Systems and Applications Meeting December 3 - 5, 1985 DuPont Plaza Hotel Washington, DC
Pages:	245 - 260
Cite this article:	Imae, Michito, Uratsuka, Makoto, Miki, Chihiro, Morikawa, Takao, Akatsuka, Kosuke, Yoshimura, Kazuyuki, "Long Term Time Comparison with GPS Receivers," Proceedings of the 17th Annual Precise Time and Time Interval Systems and Applications Meeting, Washington, DC, December 1985, pp. 245-260.
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