Using IGS Products for Near Real-Time Comparison of UTC(k)'s

Pascale Defraigne, Quentin Baire, and Eric Pottiaux

Abstract:	The time-transfer technique based on Precise Point Positioning (PPP) has proven to be a very effective technique allowing the comparison of atomic clocks with a precision of a hundred picoseconds, and with latency of two days. Using satellite orbit and clock information from the IGS real-time products, or from the NRCan Ultra Rapid products (EMU), it is now possible to compute very precise time transfer solutions in near-real-time mode (latency down to some minutes), using the PPP approach. This paper presents the PPP-based time transfer results obtained in near-real-time with the new version of the GNSS data processing software Atomium. These results are available continuously on the webpage http://clock.oma.be. From the statistics on the results, it is concluded that the near-real-time PPP allows to detect a clock jump larger than 1.5 ns after some minutes, or 0.8 ns after 90 minutes, and a frequency change larger than 2e-14 when looking at the last 24hr data, or larger than 2e-13 when looking at the last 2 hours.
Published in:	Proceedings of the 44th Annual Precise Time and Time Interval Systems and Applications Meeting November 26 - 29, 2012 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	53 - 64
Cite this article:	Defraigne, Pascale, Baire, Quentin, Pottiaux, Eric, "Using IGS Products for Near Real-Time Comparison of UTC(k)'s," Proceedings of the 44th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, November 2012, pp. 53-64.
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