BIPM comparison of time transfer techniques

Arias, F.; Jiang, Z.; Lewandowski, W.; Petit, Gérard

doi:10.1109/freq.2005.1573951

Cited by 31 publications

(13 citation statements)

References 1 publication

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“…Two-way satellite time and frequency transfer (TWSTFT) [1] is a precise time transfer method and has developed into a widely used technique in those laboratories contribute to the generation of International Atomic Time (TAI) and realization of UTC [2], [3]. Rules of data taking, processing, and reporting, for TWSTFT direct-link, are laid down in the recommendation ITU-R TF.1153-2.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Asia-Pacific TWSTFT network performance utilizing DPN results

Lin

Huang

Liao

et al. 2011

2011 Joint Conference of the IEEE International Frequency Control and the European Frequency and Time Forum (FCS) Proceedings

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Two-way satellite time and frequency transfer is a precise time transfer method and has being used to generate the TAI since 1999. Nowadays, TWSTFT links have formed a worldwide network and the utilization of the highly redundant TWSTFT data become an important topic. In our pervious study, a feasible method has been proposed, with full time transfer network data, to improve the results of TWSTFT network.Besides, NICT has recently developed the software-defined radio based two-way time transfer modems using the dual pseudo random noise (DPN) signal. The first DPN two-way time transfer experiments, using these modems, were performed between NICT(Japan) and TL(Taiwan) from March to December 2010 and its ability in improving the time transfer precision was approved on the Japan-Taiwan baseline. In compare with the conventional NICT-TL TWSTFT link, the DPN time transfer results have higher precision and less diurnals.Since the DPN results show better performance than the conventional TWSTFT time transfer, we would adopt the DPN results for the NICT-TL link, and solve the TWSTFT+DPN network solution by using our proposed method. The numerical results about how the DPN data can benefit the performance of TWSTFT network will be illustrated in the paper.

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Section: Introductionmentioning

confidence: 99%

Improvement of the Asia-Pacific TWSTFT network performance utilizing DPN results

Lin

Huang

Liao

et al. 2011

2011 Joint Conference of the IEEE International Frequency Control and the European Frequency and Time Forum (FCS) Proceedings

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“…The high precision of PPP technology derives from the use of observed data from the carrier phase [5], [8], [9]. These two technologies are currently officially employed by Bureau International des Poids et Mesures for international atomic time (TAI) and coordinated universal time (UTC) computation [10] - [12].…”

Section: Introductionmentioning

confidence: 99%

Research on Evaluation Method of Time Transfer Performance Between Ground Stations in Two-Way Satellite Comparison Network

Wang

et al. 2021

IEEE Access

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“…T wo-way satellite time and frequency transfer (TWsT-FT) is one of the major techniques to compare the atomic time scales between timekeeping laboratories [1]. as more and more regular TWsTFT measurements have been performed, the large number of point-to-point 2-way time transfer links has grown to be a complex network.…”

Section: Introductionmentioning

confidence: 99%

Improving TWSTFT short-term stability by network time transfer

Tseng

Lin

Feng

et al. 2010

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

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Two-way satellite time and frequency transfer (TWSTFT) is one of the major techniques to compare the atomic time scales between timing laboratories. As more and more TWSTFT measurements have been performed, the large number of point-to-point 2-way time transfer links has grown to be a complex network. For future improvement of the TWSTFT performance, it is important to reduce measurement noise of the TWSTFT results. One method is using TWSTFT network time transfer. The Asia-Pacific network is an exceptional case of simultaneous TWSTFT measurements. Some indirect links through relay stations show better shortterm stabilities than the direct link because the measurement noise may be neutralized in a simultaneous measurement network. In this paper, the authors propose a feasible method to improve the short-term stability by combining the direct and indirect links in the network. Through the comparisons of time deviation (TDEV), the results of network time transfer exhibit clear improved short-term stabilities. For the links used to compare 2 hydrogen masers, the average gain of TDEV at averaging times of 1 h is 22%. As TWSTFT short-term stability can be improved by network time transfer, the network may allow a larger number of simultaneously transmitting stations.

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BIPM comparison of time transfer techniques

Cited by 31 publications

References 1 publication

Improvement of the Asia-Pacific TWSTFT network performance utilizing DPN results

Improvement of the Asia-Pacific TWSTFT network performance utilizing DPN results

Research on Evaluation Method of Time Transfer Performance Between Ground Stations in Two-Way Satellite Comparison Network

Improving TWSTFT short-term stability by network time transfer

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