The Establishment of a Brazilian Atomic Time Scale

Ricardo José de Carvalho

Abstract:	The Atomic Time Scale at the Time Service Division of the National Observatory in Rio de Janeiro (ONRJ) has been carried out by commercial cesium clocks. The UTC(ONRJ) time scale based on a single commercial cesium clock selected from the ensemble of clocks is not suitable to attain the bounds of uncertainty recommended by the ITU-R and by the CCTF. The recommendation has suggested to the national time primary laboratories to coordinate with UTC within ±0.1µs. The development of atomic time scale system was divided in two parts: the construction of an automated data acquisition system and the implementation of the time scale algorithm that generated a time scale based on the clock ensemble. The present work will describe the atomic time scale system and report the results obtained using real clocks data from September 27, 2004 to August 15, 2005.
Published in:	Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting August 29 - 31, 2005 Vancouver, Canada
Pages:	254 - 260
Cite this article:	de Carvalho, Ricardo José, "The Establishment of a Brazilian Atomic Time Scale," Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting, Vancouver, Canada, August 2005, pp. 254-260.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In