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International UTC TAI comparison based on BDS PPP

Submit Time: 2018-01-07
Author: Yulong Ge National Time Service Center, Chinese Academy of Sciences ; Baoqi Sun National Time Service Center, Chinese Academy of Sciences ; WeiJin Qin National Time Service Center, Chinese Academy of Sciences ; Mingjun Ouyang National Time Service Center, Chinese Academy of Sciences ; Xuhai Yang National Time Service Center, Chinese Academy of Sciences ;
Institute: 1.National Time Service Center,Chinese Academy of Sciences; 2.University of Chinese Academy of Sciences; 3.Key Laboratory of Precise Positioning and Timing Technology, Chinese Academy of Sciences; 4.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China.;

Abstracts

The BeiDou navigation satellite system (BDS) developed by China, and provided official service for Asia-pacific region freely since 2012. With development of BDS, BDS-based time transfer has become an important research direction in BDS’s application fields. At present, the main method of BDS-based time transfer is BDS Common View (BDS CV), which can reach nanoseconds magnitude. Hence, we investigate the performance time transfer based on BDS precise point positioning (PPP) toward UTC/TAI compute. In this contribution, we focus on UTC/TAI comparison based on BDS PPP by using developed quad-constellation GNSS software, which called National Time System Center’s (NTSC) Bernese. And a long-term data analysis is presented. The experiments include two parts: (1) The reliability of the software and multi-GNSS products; (2) The performance of the BDS PPP toward International UTC/TAI comparison. The experimental results reveal that the accuracy of NTSC’s Bernese GPS PPP can reach about 0.1 ns relative to BIPM TAI PPP solutions. Compared with BIPM TAI PPP solutions, the accuracy of GPS PPP solutions can achieve about 0.2 ns by using multi-GNSS precise products, such as GBM, COM. For BDS PPP solutions, the solutions of GPS PPP are regarded as reference values. It is demonstrated that the accuracy of time transfer based on BDS PPP can reach better 1 ns toward UTC/TAI comparison for the statistics of 30 days-arc solutions, while 0.1 ns magnitude can be achieved for the statistics of daily solutions due to the influence of the day boundary discontinuity. Moreover, four different processing strategies of BDS PPP which include tropospheric delay fixed, tropospheric delay and coordinates fixed, coordinates fixed, and BDS-only are tested. Results show that the comparable accuracy can be achieved for four processing strategies. Hence, one can conclude that the time transfer based on BDS-only PPP show a good performance toward UTC/TAI computation.
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From: 葛玉龙
DOI:10.12074/201711.02398
Recommended references: Yulong Ge,Baoqi Sun,WeiJin Qin,Mingjun Ouyang,Xuhai Yang.(2018).International UTC TAI comparison based on BDS PPP.[ChinaXiv:201711.02398] (Click&Copy)
Version History
[V2] 2018-01-07 20:51:47 chinaXiv:201711.02398V2 Download
[V1] 2017-11-14 10:54:44 chinaXiv:201711.02398v1(View This Version) Download
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