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1. chinaXiv:201711.02426 [pdf]

International time transfer of the Galileo initial service Based on the PPP method

Mingjun,Ouyang; Baoqi,Sun; Yulong,Ge ; Xuhai,Yang
分类: 物理学 >> 普通物理:统计和量子力学,量子信息等

The Galileo initial service is officially launched in December 15, 2016, by the European Commission (EC), owner of the European Galileo global navigation satellite system. This paper performs various experiments to test the Galileo initial service [Is not it better to use “Galileo initial service” instead of “Galileo system of initial service”?]using the Precise Point Position (PPP) method and selecting the time transfer links, and investigate its feasibility for the international time transfer. The time transfer links are constituted of the PTBB[What is the exact term?] site and MEGX sites connected with high-precision atomic clocks. We consider the results of the GPS PPP as reference, with a total of 138 days observation data, i.e. from December 15, 2016 to May 1, 2017. To investigate the reliability of the Galileo PPP based on the International UTC/TAI, we will design and carry out seven solutions with different options on the parameter selection, products utilization and the frequency selection. The experimental results show that the STD (Standard Deviation) ranges from 0.2ns to 0.5ns. This means, the PPP method reduces the time transfer [Right?]of the service of the international to nanosecond.

提交时间: 2017-11-19 点击量40, 下载量11

2. chinaXiv:201711.02398 [pdf]

International UTC TAI comparison based on BDS PPP

Yulong Ge
分类: 地球科学 >> 地球科学其他学科

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.

提交时间: 2017-11-14 点击量65, 下载量20

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