Long Term Time Comparison With GPS Receivers
Abstract
The Radio Research Laboratory (RRL) has been making the international time comparison since 1984 by using a GPS (Global Positioning System) time-transfer receiver which was developed by RRL (GTR-I). 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 URL to the TAI. The time-transfer results between RRL and other time keeping organizations (international and domestic) via GFS using GTR-1 are presented. In the case of international time-transfer, between RRL and USNO, the precision is about 2O 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 (stability of via SV#i - via SV#j) is 1 - 2 x 10 /tau( day) in both cases. The ionospheric effect on time-transfer via the GPS Li signal was quantitatively estimated by using the total electron contests data measured at RRL. Instabilities due to the ionospheric effects are more than 2.6 x 10 /tau(day) during around solar maximum and about 8 x 1O during solar minimum for the intercontinental time-transfers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1985
- Accession Number
- ADA494350
Entities
People
- Chihiro Miki
- Kazuyuki Yoshimura
- Kosuke Akatsuka
- Makoto Uratsuka
- Michito Imae
- Takao Morikawa