Influence of Precise Products on the Day-Boundary Discontinuities in GNSS Carrier Phase Time Transfer

doi:10.3390/s21041156

NTSC-IR

	Influence of Precise Products on the Day-Boundary Discontinuities in GNSS Carrier Phase Time Transfer
	Zhang, Xiangbo 1,2; Guo, Ji1,2,3,4 ; Hu, Yonghui1,2,3 ; Sun, Baoqi 1,2,4; Wu, Jianfeng1,2,3 ; Zhao, Dangli1,2,3 ; He, Zaimin1,2,3
	2021-02-01
发表期刊	SENSORS
卷号	21 期号:4 页码:23
摘要	Global navigation satellite system (GNSS) precise point positioning (PPP) has been widely used for high-precision time and frequency transfer. However, the day-boundary discontinuities at the boundary epochs of adjacent days or batches are the most significant obstacle preventing PPP from continuous time transfer. The day-boundary discontinuities in station estimates and time comparisons are mainly caused by the code-pseudorange noise during the analysis of observation data in daily batches, where the absolute clock offset is determined by the average code measurements. However, some discontinuities with amplitudes even more than 0.15 ns may still appear in station clock estimates and time comparisons, although several methods had been proposed to remove such discontinuities. The residual small amplitude of the day-boundary discontinuities in some PPP station clock estimates and time comparisons through new GNSSs like Galileo seems larger, especially using precise clock products with large discontinuities. To further understand the origin of the day-boundary discontinuities, the influence of GNSS precise products on the day-boundary discontinuities in PPP station clock estimates and time comparisons is investigated in this paper. Ten whole days of Multi-GNSS Experiment (MGEX) from modified Julian date (MJD) 59028 to 59037 are used as the observation data. For a comparative analysis, the station clock estimates are compared with global positioning system (GPS) and Galileo observations through PPP and network solutions, separately. The experimental results show that the daily discontinuities in current combined GPS final and rapid clock products are less than 0.1 ns, and their influence on the origin of day-boundary discontinuities in PPP station clock estimates and time comparison are statistically negligible. However, the daily discontinuities in individual Analysis Centers (ACs) GPS products are more extensive, and their influence on the origin of the day-boundary discontinuities in GPS PPP station clock estimates cannot be ignored. The day-boundary discontinuities demonstrate random walk noise characteristics and deteriorate the station clocks' long-term frequency stability, especially at an average time of more than one day. Although Galileo clock daily discontinuities are different from those of GPS, their influence on the day-boundary discontinuities in station clock estimates is nearly similar to the GPS PPP. The influence of daily discontinuities of Galileo clocks on PPP time comparison is similar to GPS and is not particularly critical to time comparison. However, combined and weighted MGEX products should be developed or Galileo IPPP should be used for remote comparison of high-stability clocks.
关键词	GNSS precise point positioning time comparison station clock estimates day-boundary discontinuity precise products frequency stability
资助者	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Forwarding navigation and communication integrated test system project ; Forwarding navigation and communication integrated test system project ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Forwarding navigation and communication integrated test system project ; Forwarding navigation and communication integrated test system project ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Forwarding navigation and communication integrated test system project ; Forwarding navigation and communication integrated test system project ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Forwarding navigation and communication integrated test system project ; Forwarding navigation and communication integrated test system project ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences
DOI	10.3390/s21041156
语种	英语
资助项目	National Natural Science Foundation of China[12073034] ; Forwarding navigation and communication integrated test system project[ZFS19001D(03)] ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents[Y917SC1S05] ; Western Youth Scholar Foundation of Chinese Academy of Sciences[XAB2017A05]
资助者	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Forwarding navigation and communication integrated test system project ; Forwarding navigation and communication integrated test system project ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Forwarding navigation and communication integrated test system project ; Forwarding navigation and communication integrated test system project ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Forwarding navigation and communication integrated test system project ; Forwarding navigation and communication integrated test system project ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Forwarding navigation and communication integrated test system project ; Forwarding navigation and communication integrated test system project ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; the Scientific Research Foundation of National Time Service Center for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences
WOS研究方向	Chemistry ; Engineering ; Instruments & Instrumentation
WOS类目	Chemistry, Analytical ; Engineering, Electrical & Electronic ; Instruments & Instrumentation
WOS记录号	WOS:000624668300001
出版者	MDPI
引用统计
文献类型	期刊论文
条目标识符	http://210.72.145.45/handle/361003/12141
专题	中国科学院国家授时中心
通讯作者	Zhang, Xiangbo
作者单位	1.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Key Lab Time & Frequency Primary Stand, Xian 710600, Peoples R China 4.Chinese Acad Sci, Key Lab Precise Positioning & Timing Technol, Xian 710600, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xiangbo,Guo, Ji,Hu, Yonghui,et al. Influence of Precise Products on the Day-Boundary Discontinuities in GNSS Carrier Phase Time Transfer[J]. SENSORS,2021,21(4):23.
APA	Zhang, Xiangbo.,Guo, Ji.,Hu, Yonghui.,Sun, Baoqi.,Wu, Jianfeng.,...&He, Zaimin.(2021).Influence of Precise Products on the Day-Boundary Discontinuities in GNSS Carrier Phase Time Transfer.SENSORS,21(4),23.
MLA	Zhang, Xiangbo,et al."Influence of Precise Products on the Day-Boundary Discontinuities in GNSS Carrier Phase Time Transfer".SENSORS 21.4(2021):23.