Common-View and Melting-Pot GPS Time Transfer With the UT+

F. Meyer

Abstract:	I report results of GPS time transfer relized in France between the BNM-LPTF (Bureau National de Metrologie-Laboratoire Primaire du Temps et des Frequences) at the Paris Observatory (OP) and Besancon Observatory (OB) using an Oncore UT+ receiver, Motorola’s last evolution of precise-time-capable GPS receivers. So-called “melting pot” measurement sessions, where all visible satellites are tracked to produce one average time measurement, were conducted and are reported on. A solution to overcome the poor set of controlling commands of the early versions of the UT + to lead single-satellite common-view is presented, together with experimental data. The performance reached by the two methods is discussed against their respective constraints. Performance is evaluated by comparisons with data acquired through classical time dedicated GPS receivers (Sercel NRT2 and A0 TTR5). An operational solution allowing frequency comparisons to the French national standards at the level of a few IO-14 over a I-day averaging time, based on UT+ melting-pot measurements, is presented.
Published in:	Proceedings of the 32th Annual Precise Time and Time Interval Systems and Applications Meeting November 28 - 30, 2000 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	147 - 156
Cite this article:	Meyer, F., "Common-View and Melting-Pot GPS Time Transfer With the UT+," Proceedings of the 32th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, November 2000, pp. 147-156.
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