Carrier-phase-based two-way satellite time and frequency transfer

Fujieda, Miho; Gotoh, Tadahiro; Nakagawa, Fumimaru; Tabuchi, Ryo; Aida, Masanori; Amagai, Jun

doi:10.1109/tuffc.2012.2503

Cited by 45 publications

(37 citation statements)

References 16 publications

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“…One can, however, still measure t c repetitively, and the variation from the initial measurement can be tracked when the variation of c between adjacent measurements is guaranteed to be smaller than π. This has already been demonstrated in [2].…”

Section: Carrier Phase Two-way Time Transfer (Twcp)supporting

confidence: 58%

“…To cancel the propagation delay, we employ the two-way time transfer (TWTT) technique [1] that was originally used in satellite time and frequency transfer (TWSTFT). Later, carrier-phase TWSTFT (TWCP) [2] was developed to measure the variation of time at a much higher precision. TWCP gives higher precision in tracking the variation of the time reference but it only tells us the variation from the initial measurement since the carrier phase itself does not contain precise time information.…”

Section: Introductionmentioning

confidence: 99%

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Demonstration of wireless two-way interferometry (Wi-Wi)

et al. 2017

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Wireless two-way interferometry (Wi-Wi) is the simplified version of "carrier phase based two-way satellite time and frequency transfer," wherein a wireless communication technology is used instead of a satellite communication technology. We used the carrier phase of a 2.4 GHz ZigBee module to measure the variation of two rubidium clocks at remote sites. Since clocks in the ZigBee module are much less precise than rubidium clocks, the carrier phase of the ZigBee signal cannot be used to compare two rubidium clocks in a simple manner. Using a technique to cancel the clock error of transmitters, we demonstrated picosecond-level precision measurement of the time variation of clocks between two remote systems. This synchronization technique at picosecond-level precision opens the door to low-cost wireless positioning at millimeter accuracy.

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Section: Carrier Phase Two-way Time Transfer (Twcp)supporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Demonstration of wireless two-way interferometry (Wi-Wi)

et al. 2017

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“…The group delay and the carrier phase of the received signals were detected by demodulation using a replica code, by which we derived the fractional frequency difference of the two H-masers. The technical details of the TWCP system are described in [14,15]. The frequency ratio of the 87 Sr lattice clocks is obtained through the ratio of the two H-masers in real time.…”

Section: Fig 1 Schematic Diagram Of the Frequency Comparison Of Twomentioning

confidence: 99%

“…As an alternative, carrier-phase based two-way satellite time and frequency transfer (TWCP), first demonstrated by U.S. Naval Observatory [13], is lately characterized in NICT for various ranges of the baselines up to 9 000 km which is realized between NICT and PTB [14,15]. Among satellite based techniques the TWCP technique has a superior short term instability (evaluated to be at the 10 −13 level at 1 s) and is thus particularly suitable for comparing frequency standards with low instabilities, e.g.…”

mentioning

confidence: 99%

Direct comparison of optical lattice clocks with an intercontinental baseline of 9000 km

Hachisu¹,

Fujieda²,

Nagano³

et al. 2014

Opt. Lett.

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We have demonstrated a direct frequency comparison between two 87 Sr lattice clocks operated in intercontinentally separated laboratories in real time. Two-way satellite time and frequency transfer technique based on the carrier phase was employed for a direct comparison with a baseline of 9 000 km between Japan and Germany. A frequency comparison was achieved for 83 640 s resulting in a fractional difference of (1.1 ± 1.6) × 10 −15 , where the statistical part is the biggest contribution to the uncertainty. This measurement directly confirms the agreement of the two optical frequency standards on an intercontinental scale.

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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

Droste

Grebing²,

Leute³

et al. 2014

2014 IEEE International Frequency Control Symposium (FCS)

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Carrier-phase two-way satellite frequency transfer over a very long baseline M Fujieda, D Piester, T Gotoh et al.A study on the common-view and all-in-view GPS time transfer using carrier-phase measurements Seung Woo Lee, Bob E Schutz, Chang-Bok Lee 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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Carrier-phase-based two-way satellite time and frequency transfer

Cited by 45 publications

References 16 publications

Demonstration of wireless two-way interferometry (Wi-Wi)

Demonstration of wireless two-way interferometry (Wi-Wi)

Direct comparison of optical lattice clocks with an intercontinental baseline of 9000 km

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

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