An Uncertainty Study on Traceable Frequency and Time with Disciplined Oscillators for Metrology and Financial Sectors

Piester, D.; Bauch, A.; Peik, E.; Polewka, T.; Staliuniene, Egle; Teichel, Kristof

doi:10.1109/fcs.2019.8856142

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…Users in Germany who seek to obtain traceability to German legal time from GNSS signals are advised to take note of the contents of the TSB. A brief discussion of an uncertainty estimation can be found in Piester et al (2019b). We have also given guidance on how data analysis should be performed following standard routines to obtain evidence of the performance of the user's local equipment.…”

Section: Ptb Documentationmentioning

confidence: 99%

On the possibility of getting traceable time and frequency measurements via GNSS receivers

et al. 2020

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The realization of Coordinated Universal Time, one of the tasks of the International Bureau of Weights and Measures, relies on a network of international time links which currently is organized in a star-like scheme that links all contributing laboratories. GPS signal reception is the technique most widely employed by the laboratories. The PTB currently plays a unique role in the process due to its function as the central pivot in the time transfer between the participating laboratories. We discuss how the PTB meets its obligations to the international timekeeping community as well as to its users in Germany. In its role as an National Metrology Institute (NMI), PTB is entrusted with the realization and dissemination of legal time in Germany. The services were offered to the public support measurements and timing applications traceable to the national and international standards to be made in calibration laboratories and in many industrial sectors. We thus discuss the meaning and definition of traceability, how different GNSS systems can be used to establish traceability and their performance in doing so.

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Section: Ptb Documentationmentioning

confidence: 99%

On the possibility of getting traceable time and frequency measurements via GNSS receivers

et al. 2020

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“…Significant documentation on traceability to US standards was published earlier [21,22]. Those form together with previous papers of this work's authors [23][24][25] the foundation of this report. Based on already available guidelines [26,27] we illustrate in the next section a full scheme for traceable frequency measurements with counters in a calibration laboratory.…”

Section: Introductionmentioning

confidence: 89%

“…Its current format is described in [25] (for availability information see section 2). How the data are prepared for the TSB is described in [24] and here summarized as follows. The used GNSS receiver provides CGGTTS formatted data which are averaged after a suitable MAD filter removed outliers.…”

Section: Monitoring Utc(ptb)-gps Timementioning

confidence: 99%

Traceable frequency measurements with counters

Piester,

Staliuniene,

Bauch

2024

Meas. Sci. Technol.

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Received signals from Global Navigation Satellite Systems (GNSS) are nowadays widely used by industry laboratories for ensuring metrological traceability for their respective range of calibration services in the field of time and frequency. Usually, a local frequency standard is steered by continuous GNSS signal reception providing at its output stable and accurate reference signals for the laboratory measurement equipment, in general for synthesizers and counters. Reception of GNSS signals is surely an adequate and practical tool for the purpose, however further steps are needed to establish traceability in a strict metrological sense. Based on already available guidelines and publications, this paper is a contribution to the discussion how metrological traceability to internationally accepted standards can be established in a calibration laboratory. We restrict the discussion to equipment in common use which may not necessarily be of the highest sophistication. In this spirit, we develop a detailed scheme for an uncertainty budget comprising all links of the traceability chain from the device under test to the SI second, the scale-unit of Coordinated Universal Time. Then we go through and apply this scheme step by step to a demonstration setup for frequency measurements with a counter with varying operational parameters. In this framework, a novel approach to distinguish between components of statistical measurement uncertainty is introduced. Furthermore, the limiting uncertainty contributions are discussed and based on a suitable set of parameters an expression for the best measurement capability is given. With this scheme at hand a user may develop an uncertainty budget adapted to his own setup, especially if acceptance from a national accreditation body is sought.

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“…GPS-disciplined oscillators (GPS-DO) are a widely used option that can provide a frequency instability at the 10 −13 level and sub-microsecond synchronization [2], [3]. However, this stability is not sufficient for all applications, and there are increasing concerns over the vulnerability of systems based on Global Navigational Satellite Systems (GNSS) to service interruptions or spoofing and jamming attacks [4].…”

Section: Introductionmentioning

confidence: 99%

Fiber-Optic Frequency and Timing Transfer Over an Urban Optical Fiber Link

Fujieda

Kumagai

2023

IEEE Open J. Ultrason., Ferroelect., Freq. Contr.

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We have developed a fiber-optic frequency and timing transfer system. It has been installed to provide timing synchronization between NICT and a distant university site connected by a 58-km urban optical fiber link. The timing signal generated at the remote site is derived from a frequency source that is stabilized using the link, and it is synchronized by a transferred timing marker. A second, separate fiber link confirms a timing synchronization uncertainty of 5.7 ns and a 10-MHz frequency instability of less than 10 −16 at 10 5 s averaging time. We additionally demonstrate a timing marker delivery using a code-based signal, which combines nanosecond-level uncertainty with the simplicity and compactness suitable for a system that can be deployed for synchronization across numerous sites. INDEX TERMSFrequency transfer, time transfer, optical fibers.

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An Uncertainty Study on Traceable Frequency and Time with Disciplined Oscillators for Metrology and Financial Sectors

Cited by 4 publications

References 8 publications

On the possibility of getting traceable time and frequency measurements via GNSS receivers

On the possibility of getting traceable time and frequency measurements via GNSS receivers

Traceable frequency measurements with counters

Fiber-Optic Frequency and Timing Transfer Over an Urban Optical Fiber Link

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