SIM Time Scale

Time measurement is of great importance for science, technology, and commerce. Among the seven base units of the International System of Units, the second can be realized with the smallest uncertainty, currently reaching parts in 10 16 . Keeping track of the continuous accumulation of seconds allows...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2013-12, Vol.62 (12), p.3343-3350
Main Authors: Lopez-Romero, Jose Mauricio, Lombardi, Michael A., Diaz-Munoz, Nelida, de Carlos-Lopez, Eduardo
Format: Article
Language:English
Subjects:
Atomic clocks
Complement
frequency standards
Global Positioning System
GPS common-view
Instrumentation
Internet
measurement methods
Metric system
Metrology
Real time
Real-time systems
remote comparisons
SIM
Time measurement
time scales
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Summary:Time measurement is of great importance for science, technology, and commerce. Among the seven base units of the International System of Units, the second can be realized with the smallest uncertainty, currently reaching parts in 10 16 . Keeping track of the continuous accumulation of seconds allows the formation of time scales that serve as references for applications that require synchronization to national and international standards. This paper presents and discusses a multinational time scale developed for the Sistema Interamericano de Metrologia (SIM). This time scale, known as the SIM time scale, or SIMT, was developed to complement the official world time scale, Coordinated Universal Time, by providing real-time support to the operational timing systems within the SIM region. SIMT is generated from automated comparisons of time standards in North, Central, and South America, and is believed to be the first operational multinational time scale whose results are continuously published in real time via the Internet.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2013.2272866