Journal Article10.1109/TIM.2013.2272866
SIM Time Scale
TL;DR: A multinational time scale developed for the Sistema Interamericano de Metrologia (SIM), known as 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.
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Abstract: 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 1016. 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.
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Citations
Three-Cornered Hat Method via GPS Common-View Comparisons
TL;DR: An enhanced TCH method is presented and implemented, yielding corrections up to 30% in the Allan deviation estimates, the main feature of the developed method is the possibility of computing the absolute stability of remote clocks at averaging times of about 2 h.
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The Development of a Unified Time and Frequency Program in the SIM Region
J. Mauricio Lopez-Romero,Michael A. Lombardi +1 more
- 01 Sep 2010
TL;DR: This paper summarizes work done by the SIM Time and Frequency Metrology Working Group from 2004 to 2010 and provides an overview of two major achievements of the working group: theSIM Time Network (SIMTN) and the SIMT scale.
8
Improved Performance, Remote Realization, and Accessibility of the Inter-American Metrology System (SIM) Time Scale | NIST
Michael A. Lombardi,J. Mauricio Lopez-Romero,Nelida Diaz-Munoz,E. de Carlos-Lopez +3 more
- 07 Aug 2014
TL;DR: The main features of the SIMT algorithm are presented and an evaluation of its recently improved performance is provided and how the SIM frequency and time data can be easily accessed from any Internet device, including mobile devices such as tablets and smartphones is discussed.
1
SIM Time Scale: 10 Years of Operation
J. M. Lopez,Michael A. Lombardi,E. de Carlos,N. Diaz,C. A. Ortiz +4 more
- 29 Mar 2018
TL;DR: A SIMT evaluation based on data from August 2016 to January 2018 is presented and an averaged time scale computed in near real-time from time difference data that the SIMTN produces and publishes every 10 minutes is presented.
Improvements in SIM Time Network and SIM Time Scale Performance | NIST
Michael A. Lombardi,J. Mauricio Lopez-Romero,Nelida Diaz-Munoz,E. de Carlos-Lopez,Marina Gertsvolf,Ricardo de Carvalho +5 more
- 10 Oct 2014
TL;DR: A significant improvement in both accuracy and stability of the SIMT is found, with results in good agreement with the Rapid UTC (UTCr) time scale published by the Bureau International des Poides et Mesures (BIPM).
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