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Sensors 2018, 18(4), 1017; https://doi.org/10.3390/s18041017

Modeling and Assessment of Precise Time Transfer by Using BeiDou Navigation Satellite System Triple-Frequency Signals

1,2,3,4,* , 1,3
,
1,2
,
1,3
and
1,2,3
1
National Time Service Center, Chinese Academy of Sciences, Shu Yuan Road, Xi’an 710600, China
2
Key Laboratory of Precision Navigation and Timing Technology, Chinese Academy of Sciences, Shu Yuan Road, Xi’an 710600, China
3
University of Chinese Academy of Sciences, Yu Quan Road, Beijing 100049, China
4
State Key Laboratory of Geo-Information Engineering, Yan Ta Road, Xi’an 710054, China
*
Author to whom correspondence should be addressed.
Received: 2 March 2018 / Revised: 19 March 2018 / Accepted: 21 March 2018 / Published: 29 March 2018
(This article belongs to the Section Remote Sensors)
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Abstract

This study proposes two models for precise time transfer using the BeiDou Navigation Satellite System triple-frequency signals: ionosphere-free (IF) combined precise point positioning (PPP) model with two dual-frequency combinations (IF-PPP1) and ionosphere-free combined PPP model with a single triple-frequency combination (IF-PPP2). A dataset with a short baseline (with a common external time frequency) and a long baseline are used for performance assessments. The results show that IF-PPP1 and IF-PPP2 models can both be used for precise time transfer using BeiDou Navigation Satellite System (BDS) triple-frequency signals, and the accuracy and stability of time transfer is the same in both cases, except for a constant system bias caused by the hardware delay of different frequencies, which can be removed by the parameter estimation and prediction with long time datasets or by a priori calibration. View Full-Text
Keywords: BeiDou; triple-frequency signals; time transfer; precise point positioning BeiDou; triple-frequency signals; time transfer; precise point positioning
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Tu, R.; Zhang, P.; Zhang, R.; Liu, J.; Lu, X. Modeling and Assessment of Precise Time Transfer by Using BeiDou Navigation Satellite System Triple-Frequency Signals. Sensors 2018, 18, 1017.

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