A study on the Common-View and All-in-View GPS time transfer using carrier-phase measurements

Lee, Seung Woo; Schutz, B. E.; Lee, Chang Bok; Yang, Sung Hoon

doi:10.1088/0026-1394/45/2/005

Cited by 37 publications

(29 citation statements)

References 12 publications

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“…The network in particular would enable stability tests of satellite-based time transfer techniques (see the previous discussion) and of the timing facilities of the global navigation satellite systems GPs and Galileo [35].…”

Section: Discussionmentioning

confidence: 99%

“…Prominent examples are tests on possible violations of the equivalence principle of general relativity and on the possible drift of the fine structure constant [35]. clearly, the ability to perform comparisons between distant optical clocks at the highest possible accuracy level is also a prerequisite for a possible redefinition of the sI second on the basis of an optical clock.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Phase-coherent frequency comparison of optical clocks using a telecommunication fiber link

Schnatz¹,

Terra²,

Predehl

et al. 2010

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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We have explored the performance of 2 "dark fibers" of a commercial telecommunication fiber link for a remote comparison of optical clocks. These fibers establish a network in Germany that will eventually link optical frequency standards at PTB with those at the Institute of Quantum Optics (IQ) at the Leibniz University of Hanover, and the Max Planck Institutes in Erlangen (MPL) and Garching (MPQ). We demonstrate for the first time that within several minutes a phase coherent comparison of clock lasers at the few 10(-15) level can also be accomplished when the lasers are more than 100 km apart. Based on the performance of the fiber link to the IQ, we estimate the expected stability for the link from PTB to MPQ via MPL that bridges a distance of approximately 900 km.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Phase-coherent frequency comparison of optical clocks using a telecommunication fiber link

Schnatz¹,

Terra²,

Predehl

et al. 2010

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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show abstract

“…The network in particular will enable stability tests of satellite-based time transfer techniques (see above) and of the timing facilities of the global navigation satellite systems GPS and Galileo [35].…”

Section: Twstft: Two Way Satellite Time and Frequency Transfermentioning

confidence: 99%

Phase-coherent frequency comparison of optical clocks using a telecommunication fiber link

Schnatz

Terra

Predehl

et al. 2009

2009 IEEE International Frequency Control Symposium Joint With the 22nd European Frequency and Time Forum

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We have explored the performance of two "dark fibers" of a commercial telecommunication fiber link for a remote comparison of optical clocks. These fibers establish a network in Germany that will eventually link optical frequency standards at PTB with those at the Institute of Quantum Optics (IQ) at the Leibniz University of Hanover, and the Max Planck Institutes in Erlangen (MPL) and Garching (MPQ). We demonstrate for the first time that within several minutes a phase coherent comparison of clock lasers at the few 10 -15 level can also be accomplished when the lasers are more than 100 km apart. Based on the performance of the fiber link to the IQ we estimate the expected stability for the link from PTB to MPQ via MPL that bridges a distance of approximately 900 km.

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“…The global positioning system (GPS) has become an effective tool for time and frequency transfer since its first application in the 1980s [1]. A technique, called the common view (CV), is applied for International Atomic Time (TAI) comparison and provides an accuracy within several nanoseconds with a low-cost receiver [2,3]. The CV method utilizes single observed GNSS data with respect to the simultaneously observed GNSS satellites from two stations so as to cancel out the common satellite's errors, which greatly simplifies the time transfer process.…”

Section: Introductionmentioning

confidence: 99%

“…The CV method utilizes single observed GNSS data with respect to the simultaneously observed GNSS satellites from two stations so as to cancel out the common satellite's errors, which greatly simplifies the time transfer process. Thanks to the international GNSS service (IGS), which provides precise orbit and clock products, another technique, called the all-in view (AV), is employed for time transfer [3]. Unlike the CV technique, AV is not affected by the distance between station pair or baseline.…”

Section: Introductionmentioning

confidence: 99%

Performance of Multi-GNSS Precise Point Positioning Time and Frequency Transfer with Clock Modeling

Dai

Qin

et al. 2019

Remote Sensing

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Thanks to the international GNSS service (IGS), which has provided multi-GNSS precise products, multi-GNSS precise point positioning (PPP) time and frequency transfer has of great interest in the timing community. Currently, multi-GNSS PPP time transfer is not investigated with different precise products. In addition, the correlation of the receiver clock offsets between adjacent epochs has not been studied in multi-GNSS PPP. In this work, multi-GNSS PPP time and frequency with different precise products is first compared in detail. A receiver clock offset model, considering the correlation of the receiver clock offsets between adjacent epochs using an a priori value, is then employed to improve multi-GNSS PPP time and frequency (scheme2). Our numerical analysis clarify how the approach performs for multi-GNSS PPP time and frequency transfer. Based on two commonly used multi-GNSS products and six GNSS stations, three conclusions are obtained straightforwardly. First, the GPS-only, Galileo-only, and multi-GNSS PPP solutions show similar performances using GBM and COD products, while BDS-only PPP using GBM products is better than that using COD products. Second, multi-GNSS time transfer outperforms single GNSS by increasing the number of available satellites and improving the time dilution of precision. For single-system and multi-GNSS PPP with GBM products, the maximum improvement in root mean square (RMS) values for multi-GNSS solutions are up to 7.4%, 94.0%, and 57.3% compared to GPS-only, BDS-only, and Galileo-only solutions, respectively. For stability, the maximum improvement of multi-GNSS is 20.3%, 84%, and 45.4% compared to GPS-only, BDS-only and Galileo-only solutions. Third, our approach contains less noise compared to the solutions with the white noise model, both for the single-system model and the multi-GNSS model. The RMS values of our approach are improved by 37.8-91.9%, 10.5-65.8%, 2.7-43.1%, and 26.6-86.0% for GPS-only, BDS-only, Galileo-only, and multi-GNSS solutions. For frequency stability, the improvement of scheme2 ranges from 0.2 to 51.6%, from 3 to 80.0%, from 0.2 to 70.8%, and from 0.1 to 51.5% for GPS-only, BDS-only, Galileo-only, and multi-GNSS PPP solutions compared to the solutions with the white noise model in the Eurasia links.

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A study on the Common-View and All-in-View GPS time transfer using carrier-phase measurements

Cited by 37 publications

References 12 publications

Phase-coherent frequency comparison of optical clocks using a telecommunication fiber link

Phase-coherent frequency comparison of optical clocks using a telecommunication fiber link

Phase-coherent frequency comparison of optical clocks using a telecommunication fiber link

Performance of Multi-GNSS Precise Point Positioning Time and Frequency Transfer with Clock Modeling

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