Research of Eliminating the Day-Boundary Discontinuities in GNSS Carrier Phase Time Transfer through Network Processing

doi:10.3390/s20092622

NTSC-IR > 时间用户系统研究室

	Research of Eliminating the Day-Boundary Discontinuities in GNSS Carrier Phase Time Transfer through Network Processing
	Zhang, Xiangbo 1,2; Guo, Ji1,2,3 ; Hu, Yonghui1,2,3 ; Zhao, Dangli1,2,3 ; He, Zaimin1,2,3
	2020-05-01
发表期刊	SENSORS
卷号	20 期号:9 页码:15
摘要	Time and frequency transfer through global navigation satellite system (GNSS) precise point positioning (PPP) based on carrier-phase measurements has been widely used for clock comparisons in national timing laboratories. However, the time jumps up to one nanosecond at the day boundary epochs of adjacent daily batches lead to discontinuities in the time transfer results. Therefore, it is a major obstacle to achieve continuous carrier phase time transfer. The day-boundary discontinuities have been studied for many years, and they are believed to be caused by the long-term pseudorange noise during estimation of the clock offset in the daily batches and are nearly in accordance with a Gaussian curve. Several methods of eliminating the day-boundary discontinuity were proposed during the past fifteen years, such as shift and overlapping, longer batch processing, clock handover, and ambiguity stacking. Some errors and new noise limit the use of such methods in the long-term clock stability comparison. One of the effective methods is phase ambiguity fixing resolution in zero-differenced PPP, which is based on the precise products of wide-lane satellite bias (WSB) provided by the new international GNSS Service (IGS) Analysis Center of Centre National d'Etudes Spatiales (CNES) and Collecte Localisation Satellites (CLS). However, it is not suitable for new GNSS, such as the Beidou Satellite System (BDS), GALILEO, and QZSS. For overcoming the drawbacks above, Multi-GNSS Experiment (MGEX) observation data of 10 whole days from MJD 58624 to 58633have been network processed by batch least square resolution. These observations come from several ground receivers located in different national timing laboratories. Code and carrier phase ionosphere-free measurements of GPS and BDS satellites are used, and the time transfer results from network processing are compared with PPP results provided by Bureau International des Poids et Mesures (BIPM) and used for international atomic time (TAI) computation (TAIPPP) and universal time coordination (UTC). It is shown that the time offsets of three different time links are almost continuous and the day-boundary discontinuities are sharply eliminated by network processing, although a little extent of day-boundary discontinuities still exist in the results of UTC(USNO)-UTC(PTB). The accuracy of time transfer has been significantly improved, and the frequency stability of UTC(NTSC)-UTC(PTB) can be up to 6.8 x 10(-15) on average time of more than one day. Thus, it is suitable for continuous multi-GNSS time transfer, especially for long-term clock stability comparison.
关键词	GNSS precise point positioning time and frequency transfer day-boundary discontinuities network MGEX frequency stability
资助者	Key Research and Development Program of Shaanxi ; Key Research and Development Program of Shaanxi ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Key Research and Development Program of Shaanxi ; Key Research and Development Program of Shaanxi ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Key Research and Development Program of Shaanxi ; Key Research and Development Program of Shaanxi ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Key Research and Development Program of Shaanxi ; Key Research and Development Program of Shaanxi ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Scientific Research Foundation of National Time Service Center (NTSC) 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/s20092622
语种	英语
资助项目	Key Research and Development Program of Shaanxi[2018GY-004] ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents[Y917SC1S05] ; Western Youth Scholar Foundation of Chinese Academy of Sciences[XAB2017A05]
资助者	Key Research and Development Program of Shaanxi ; Key Research and Development Program of Shaanxi ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Key Research and Development Program of Shaanxi ; Key Research and Development Program of Shaanxi ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Key Research and Development Program of Shaanxi ; Key Research and Development Program of Shaanxi ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Western Youth Scholar Foundation of Chinese Academy of Sciences ; Key Research and Development Program of Shaanxi ; Key Research and Development Program of Shaanxi ; Scientific Research Foundation of National Time Service Center (NTSC) for Youth Innovation Talents ; Scientific Research Foundation of National Time Service Center (NTSC) 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:000537106200186
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/361003/9359
专题	时间用户系统研究室
通讯作者	Zhang, Xiangbo
作者单位	1.Univ Chinese Acad Sci, Beijing 100039, Peoples R China 2.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Peoples R China 3.Chinese Acad Sci, Key Lab Time Frequency Stand, Xian 710600, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xiangbo,Guo, Ji,Hu, Yonghui,et al. Research of Eliminating the Day-Boundary Discontinuities in GNSS Carrier Phase Time Transfer through Network Processing[J]. SENSORS,2020,20(9):15.
APA	Zhang, Xiangbo,Guo, Ji,Hu, Yonghui,Zhao, Dangli,&He, Zaimin.(2020).Research of Eliminating the Day-Boundary Discontinuities in GNSS Carrier Phase Time Transfer through Network Processing.SENSORS,20(9),15.
MLA	Zhang, Xiangbo,et al."Research of Eliminating the Day-Boundary Discontinuities in GNSS Carrier Phase Time Transfer through Network Processing".SENSORS 20.9(2020):15.