1992•Defense Technical Information Center (DTIC)Requires access
Timescale algorithms combining cesium clocks and hydrogen masers
L. A. Breakiron
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Abstract
The USNO atomic timescale, formerly based on an ensemble of cesium clocks, is now produced by an ensemble of cesium clocks and hydrogen masers. In order to optimize stability and reliability, equal clock weighting has been replaced by a procedure reflective, time-varying noise characteristics of the two different types of clocks. Correction of frequency drift is required, and residual drift is avoided by the eventual complete deweighting of the masers.