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Session P4: Advances in Space-Based Time Transfer

Evaluation of BDS Time Transfer on Multiple Baselines for UTC
K. Liang, National Institute of Metrology (NIM), China and Bureau International des Poids et Mesures (BIPM), France; F. Arias, Z. Jiang, G. Petit, L. Tisserand, BIPM, France; Y. Wang, NIM, China; P. Uhrich, G.D. Rovera, LNE-SYRTE, Observatoire de Paris(OP), PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06., France; N. Koshelyaevsky, Russian Metrological Institute of Technical Physics and Radio Engineering (VNIIFTRI), Russia; C. Lin, National Standard Time and Frequency Laboratory, Telecommunication Laboratories, Taiwan; E.D. Powers, S. Mitchell, United States Naval Observatory; Z. Yang, A. Zhang, Z. Fang, NIM, China
Location: Regency B
Date/Time: Thursday, Feb. 1, 9:35 a.m.

The roadmap for the implementation of BeiDou Navigation Satellite System(BDS) time transfer in support of the generation of Coordinated Universal Time (UTC) network has been drawn up, including a pilot experiment to evaluate BDS time transfer on multiple baselines. Following National Institute of Metrology (NIM, Beijing), several laboratories contributing to UTC have been equipped or are planned to be equipped with the NIM-made BDS time and frequency transfer receivers. Some institutes in China and some stations from the International GNSS (Global Navigation Satellite System) Service (IGS) network have also been involved.
The satellite signal coverages at different sites in different continents is characterized regarding the satellite number, satellite elevation and azimuth. A correction for elevation dependent code bias has been applied in the code-based comparison which has been based on least-squares fitting of a second-order polynomial. This effect is evaluated and a slight improvement is obtained when analyzing the code measurement noise. The stability and accuracy of BDS time transfer are evaluated on multiple baselines. In addition, a time stability of about 1 ns has been achieved at some thousand seconds averaging time in Common Clock Difference (CCD) experiments at BIPM.



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