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Publication Citation: Automated Control of National Time Standards via the SIM Time Scale

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Author(s): Michael A. Lombardi; J. Mauricio Lopez-Romero; Nelida Diaz-Munoz;
Title: Automated Control of National Time Standards via the SIM Time Scale
Published: September 27, 2013
Abstract: This paper describes a frequency and time control system developed by the Sistema Interamericano de Metrologia (SIM). Due to limited resources, some SIM national metrology institutes maintain a low-cost rubidium clock as their national time standard, instead of the cesium clocks commonly found at larger laboratories. The system described here controls these clocks by adjusting them to agree with the SIM Time Scale (SIMT), which is distributed hourly via the Internet. The system has demonstrated the ability to keep time within {+or-}50 ns of SIMT, with frequency stability near 4 × 10-14 after one day of averaging. Due to the inherent stability limitations of the rubidium clocks, these performance levels would be impossible to maintain through manual adjustment.
Conference: 10th International Congress on Electrical Metrology, SEMETRO
Proceedings: Proceedings of 10th International Congress on Electrical Metrology, SEMETRO
Pages: pp. 1 - 4
Location: Buenos Aires, -1
Dates: September 25-27, 2013
Keywords: disciplined oscillator;frequency;GPS;time scale;time transfer
Research Areas: Physics