An Approach to a Clock Offsets Model for Real-Time PPP Time and Frequency Transfer During Data Discontinuity

doi:10.3390/app9071405

NTSC-IR

	An Approach to a Clock Offsets Model for Real-Time PPP Time and Frequency Transfer During Data Discontinuity
	Qin, Weijin1,2 ; Ge, Yulong 1,2,3; Wei, Pei1,2,3 ; Yang, Xuhai 1,2,4
	2019-04-01
发表期刊	APPLIED SCIENCES-BASEL
卷号	9 期号:7 页码:16
摘要	To resolve the dilemma in any post-processing strategy, i.e., the difficulty of monitoring the real-time time and frequency signals in a timely manner, real-time GPS time and the frequency transfer have recently become trending topics. Unfortunately, data interruption occurs when conducting real-time time transfer, sometimes from unexpected reasons. In this study, to ensure the stability and precision of real-time time transfer, an adaptive prediction model and a between-epoch constraint receiver clock model are applied as the mathematic models. The purpose of prediction is to solve the ambiguity from re-convergence when the data reappear. Moreover, compared to the conventional method, the between-epoch constraint receiver clock model is employed in this study to consider the correlation of epoch-wise clock parameters to avoid wasting useful information. The simulation data and real data are compared to verify the performance of the new approach. The simulation data for 165 days are designed with random daily interruptions of 10, 30, 60 and 90 min. Real data from 12 days is captured from the incomplete data in routine observation records. Ignoring the simulation data and real data, the investigation of six stations shows that the results with the between-epoch constraint receiver clock model were smoother than those with a white noise model. With an adaptive prediction model and the between-epoch constraint receiver clock model, the simulation results illustrate that the average root mean squares (RMS) values of all the stations are significantly reduced, i.e., by 66.03% from 0.43 to 0.14 ns, by 64.91% from 0.44 to 0.15 ns, by 57.47% from 0.43 to 0.18 ns, and by 51.67% from 0.44 to 0.21 ns for the 10, 30, 60 and 90 min data interruptions, respectively. The stability of all the stations is improved by at least 50%. The improvement increases to 100% for short-term stability. The real results show that the stability of four links is boosted by at least 5%. The model proposed in this paper is more effective in producing short-term stability than long-term stability.
关键词	real-time time transfer precise point positioning (PPP) adaptive clock prediction receiver clock offset model data discontinuity
资助者	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shaanxi ; Natural Science Foundation of Shaanxi ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shaanxi ; Natural Science Foundation of Shaanxi ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shaanxi ; Natural Science Foundation of Shaanxi ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shaanxi ; Natural Science Foundation of Shaanxi ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; Youth Innovation and Promotion Committee of the Chinese Academy of Science
DOI	10.3390/app9071405
关键词[WOS]	PRECISE ORBITS ; GPS
语种	英语
资助项目	National Natural Science Foundation of China[11703033] ; Natural Science Foundation of Shaanxi[2018JQ1020] ; Youth Innovation and Promotion Committee of the Chinese Academy of Science
资助者	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shaanxi ; Natural Science Foundation of Shaanxi ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shaanxi ; Natural Science Foundation of Shaanxi ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shaanxi ; Natural Science Foundation of Shaanxi ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shaanxi ; Natural Science Foundation of Shaanxi ; Youth Innovation and Promotion Committee of the Chinese Academy of Science ; Youth Innovation and Promotion Committee of the Chinese Academy of Science
WOS研究方向	Chemistry ; Materials Science ; Physics
WOS类目	Chemistry, Multidisciplinary ; Materials Science, Multidisciplinary ; Physics, Applied
WOS记录号	WOS:000466547500140
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/361003/11934
专题	中国科学院国家授时中心
通讯作者	Qin, Weijin
作者单位	1.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Shaanxi, Peoples R China 2.Chinese Acad Sci, Key Lab Precise Positioning & Timing Technol, Xian 710600, Shaanxi, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Qin, Weijin,Ge, Yulong,Wei, Pei,et al. An Approach to a Clock Offsets Model for Real-Time PPP Time and Frequency Transfer During Data Discontinuity[J]. APPLIED SCIENCES-BASEL,2019,9(7):16.
APA	Qin, Weijin,Ge, Yulong,Wei, Pei,&Yang, Xuhai.(2019).An Approach to a Clock Offsets Model for Real-Time PPP Time and Frequency Transfer During Data Discontinuity.APPLIED SCIENCES-BASEL,9(7),16.
MLA	Qin, Weijin,et al."An Approach to a Clock Offsets Model for Real-Time PPP Time and Frequency Transfer During Data Discontinuity".APPLIED SCIENCES-BASEL 9.7(2019):16.