Two-way satellite time transfer between USNO and PTB

Piester, D.; Bauch, A.; Becker, Juergen; Polewka, T.; McKinley, A.; Breakiron, Lee A.; Smith, Alan L.; Fonville, Blair; Matsakis, Demetrios

doi:10.1109/freq.2005.1573952

Cited by 18 publications

(12 citation statements)

References 5 publications

(6 reference statements)

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“…The frequency transfer capabilities of such a GPS link have been shown to be commensurate to the frequency instability of the active hydrogen masers under comparison [12,16,17]. In a comparison of two such masers it is therefore challenging to separate the individual contributions from each maser and from the GPS link itself.…”

Section: Methods and Experimental Setupmentioning

confidence: 99%

Characterization of a 450 km baseline GPS carrier-phase link using an optical fiber link

et al. 2015

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Carrier-phase two-way satellite frequency transfer over a very long baseline M Fujieda, D Piester, T Gotoh et al. Abstract A global positioning system (GPS) carrier-phase frequency transfer link along a baseline of 450 km has been established and is characterized by comparing it to a phase-stabilized optical fiber link of 920 km length, established between the two endpoints, the Max-Planck-Institut für Quantenoptik in Garching and the Physikalisch-Technische Bundesanstalt in Braunschweig. The characterization is accomplished by comparing two active hydrogen masers operated at both institutes. The masers serve as local oscillators and cancel out when the double differences are calculated, such that they do not constitute a limitation for the GPS link characterization. We achieve a frequency instability of 3 10 13 × − in 30 s and 5 10 16 × − for long averaging times. Frequency comparison results obtained via both links show no deviation larger than the statistical uncertainty of 6 10 16 × −. These results can also be interpreted as a successful cross-check of the measurement uncertainty of a truly remote end fiber link.

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Section: Methods and Experimental Setupmentioning

confidence: 99%

Characterization of a 450 km baseline GPS carrier-phase link using an optical fiber link

et al. 2015

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“…Reference E1 1997 TUG, DTAG, PTB [9] T1 2002 USNO, PTB [11] T2 2003 USNO, PTB [13] E2 2003 IEN, PTB [16] E3 2004 PTB, VSL, OP, NPL [17] T3 2004 USNO, PTB [14] T4 2004 USNO, PTB [14] T5 2005 USNO, PTB [14] E4 2005 PTB, SP, VSL, NPL, OP, INRIM [18] T6 2006 USNO, PTB [15] E5 2006 TUG, PTB, METAS [19] T7 2007 USNO, PTB -T8 2007 USNO, PTB -…”

Section: No Year Participating Institutesmentioning

confidence: 99%

Time transfer with nanosecond accuracy for the realization of International Atomic Time

et al. 2008

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Two-way satellite time and frequency transfer (TWSTFT) has become an important technical component in the process of the realization of International Atomic Time. To employ the full potential of the technique, especially for true time transfer, a dedicated calibration is necessary. This consists of the calibration either of the operational link at large, including every component involved, or of the involved ground stations' internal delays only. Both modes were successfully employed by circulating and operating a portable reference station between the sites involved. In this paper, we summarize the theoretical background for the different calibration modes applied and report examples of results from the 13 calibration campaigns performed up to now in Europe and between Europe and the United States. In all of these exercises, estimated uncertainties around 1 ns were achieved. Consecutive campaigns showed a very good reproducibility at the nanosecond level. Additionally, we address and briefly discuss sources that possibly limit the uncertainty for true time transfer employing TWSTFT.

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“…However, the above-mentioned ways have been hard to popularize due to the limited transmission distances, which cannot be extended to a large scale [7]. Global Navigation Satellite System, popularly known as GNSS, uses the satellites distributed evenly to pinpoint the geographic location and the local time of a user's receiver on earth [8]. The signal is free of charge and can be tracked beyond the influence of weather and the number of users [9].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis on a Traceable Precise Satellite Timing

Qin

Liu

Yang

2022

Advances in Transdisciplinary Engineering

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Polluted by the noise of the observation, precision of satellite timing based on pseudoranges can merely reach tens of nanoseconds. Considering the sharply increasing demand of high-precision timing in the many fields, a traceable precise timing system has been proposed, which means having a connection with UTC (Coordinated Universal Time). We introduce the principle of the PPP (Precise Point Positioning) timing system and conduct the experiment with the form of zero baseline, long baseline, and very long baseline, simultaneously, CV (Common View) and AV (All in View) timing solution are used for comparison. Finally, the system performance has been evaluated from the aspects of precision and stability. The results show, when the Rubidium module is the frequency source of the user terminal, the 1 PPS timing accuracy of 904 km achieved by this method is 0.32 ns, and the frequency stability can achieve about 9.51e-13, 5.58e-13 and 1.37e-13 at the averaging time of 100 s, 1000 s and 10000 s. The timing bias is approximate 2 ns. Besides, the variation of the temperature will affect the timing results. Compared to the pseudorange timing solution, improvement on the PPP short term stability is more obvious than that of long term stability.

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Two-way satellite time transfer between USNO and PTB

Cited by 18 publications

References 5 publications

Characterization of a 450 km baseline GPS carrier-phase link using an optical fiber link

Characterization of a 450 km baseline GPS carrier-phase link using an optical fiber link

Time transfer with nanosecond accuracy for the realization of International Atomic Time

Performance Analysis on a Traceable Precise Satellite Timing

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