Improvement of frequency change at Japan standard time
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Abstract
Abstract Japan Standard Time is an average atomic time generated by a group of Cs clocks at NICT. Several years ago, a problem was found in the timescale, that is, the frequency change by the removal of a clock from the group. The reason turned out to be improper clock‐rate estimation of each Cs clock. We fixed the problem by revising the clock‐rate estimation method. After this revision, the frequency change on clock removal became small. We also derived a formula to express the frequency change of the timescale by using the data of the removed clock. In some simulations and actual Japan Standard Time, this formula demonstrated its validity for estimating the frequency change. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 157(1): 29–37, 2006; Published online in Wiley InterScience ( http://www.interscience.wiley.com ). DOI 10.1002/eej.20384
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