USNO Master Clock Design Enhancements

P. Koppang, J. Skinner, D. Johns

Abstract:	We have implemented several enhancements to the US Naval Observatory (USNO) Master Clock system. Design changes to the system include the use of a Kalman filter for phase and frequency estimates, decreasing the time interval between steers, and the redesign of control parameters. The present control system utilizes “real-time” data estimates of the differences between the Master Clock and a timescale that combines hydrogen masers and commercial cesium frequency standards with a time-varying weighting scheme. We are researching a Master Clock system design that utilizes as its reference a hydrogen maser ensemble that is steered to an ensemble of cesium standards. We present system designs, simulations, and performance data.
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:	185 - 192
Cite this article:	Koppang, P., Skinner, J., Johns, D., "USNO Master Clock Design Enhancements," Proceedings of the 38th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 2006, pp. 185-192.
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