Steering UTC (AOS) and UTC (PL) by TA (PL)

J. Nawrocki, Z. Ra, W. Lewandowski, M. Malkowski, M. Marszalec, D. Nerkowski

Abstract:	The independent Polish Atomic Time Scale TA (PL) is based on about 15 cesium atomic clocks, from seven laboratories in Poland and one in Lithuania. The clocks are compared using multi-channel TTS-2 and TTS-3 time receivers. In the past, data from physically distant clocks were collected weekly; more recently, they have been gathered daily. For this purpose, special software has been developed to allow automatic data collection, and an appropriate database has been created. TA (PL) was initially computed monthly as the weighted average of the participating clocks. The long-term stability of TA (PL) was approximately 3 parts in 1015. In early 2006, experimental software for daily computations of TA (PL) was developed at the Astrogeodynamical Observatory in Borowiec (AOS) and the National Institute of Telecommunications (NIT). This software is now fully implemented, and allows daily steering of UTC (AOS) based on daily TA (PL). The purpose of this realization is to keep UTC (AOS) within ±10 ns of UTC, whereas previously it was kept within ±20 ns. Our paper describes the procedures being developed and gives most recent results.
Published in:	Proceedings of the 38th Annual Precise Time and Time Interval Systems and Applications Meeting December 7 - 9, 2006 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	379 - 388
Cite this article:	Nawrocki, J., Ra, Z., Lewandowski, W., Malkowski, M., Marszalec, M., Nerkowski, D., "Steering UTC (AOS) and UTC (PL) by TA (PL)," Proceedings of the 38th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 2006, pp. 379-388.
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