An Improvement of the Controlling Algorithm for Taiwan's Time Scaling System

Shinn-Yan Lin, Po-Cheng Chang

Abstract:	Telecommunication Laboratories (TL, Taiwan) developed a new controlling algorithm to improve the short-term and mid-term stability of TL’s time scaling system. The controlling algorithm is used for controlling a micro-phase stepper to constrict its output followed a reference paper clock, Taiwan’s local atomic time scale – TA(TL). The original system used frequently p-control adjustment to keep the system almost synchronized with the reference paper clock. The new algorithm used a derivate control mode to set the long term frequency offset of the micro-phase-stepper, and used a proportional control mode to adjust the daily phase deflection. The new algorithm improve the short-term stability of the system from 1e-13 into 4.6e-14 when the average time = 600 seconds; and the long-term Allan deviation still constrained with paper clock, up to 2e-15 when the average time is more than 7 days.
Published in:	Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting August 29 - 31, 2005 Vancouver, Canada
Pages:	240 - 243
Cite this article:	Lin, Shinn-Yan, Chang, Po-Cheng, "An Improvement of the Controlling Algorithm for Taiwan's Time Scaling System," Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting, Vancouver, Canada, August 2005, pp. 240-243.
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