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During 2003 the IEN-PTB Two-Way Satellite Time and Frequency Transfer (TWSTFT) link was calibrated using a portable reference station. The calibration activity was conducted in the framework of the Galileo System Test Bed Version 1 (GSTB V1), under a contract with Joanneum Research G.m.b.H. (Austria). The calibration constant was determined with an uncertainty lower than 1 ns. Only few months after...
GPS Time, the time scale internal to the Global Positioning System, is a uniform scale of time without leap seconds having an initial epoch of midnight, January 5/6, 1980 UTC. Galileo proposes to use a realization of TAI, another scale without leap seconds, as its internal time scale. However, TAI is ahead of GPS Time by 19 seconds, a constant value, and in 2004, GPS Time is ahead of UTC by 13 seconds...
This paper presents the performances of GPS on board clocks computed by the International GPS Service (IGS) [1]. Using recently developed IGS combined clock products referenced to IGST, the identified GPS on board clocks have no longer day boundaries discontinuities, allowing extensive analysis on large integration times. The aim of this paper is to compare the performances of the GPS on board clocks...
Today, GPS plays an important role in positioning and the dissemination of time and frequency on a global scale. In Europe, Galileo is under development and will enter service some time after 2008. Both systems will have their own timescales: GPS Time for GPS and Galileo System Time for Galileo. There are enormous benefits to be gained if GPS and Galileo can be used together as one “super-constellation”...
Precise timing is an inherent part of Global Navigation Satellite Systems (GNSS) like the Global Positioning System (GPS), Glonass and the future Galileo. GPS has been providing a UTC (Coordinated Universal Time) time distribution service since its inception. This paper will outline present performance of GPS UTC time distribution and show projections for Galileo and the planned modernized GPS UTC...
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