NDLI: Study of an Optimal Algorithm for Combing TWSTFT and GPS CV Comparisons

Content Provider	IEEE Xplore Digital Library
Author	Li Gun Hu Yong hui Zhong Chong-xia Zhou Wei
Copyright Year	2006
Description	Author affiliation: Nat. Time Service Center, Chinese Acad. of Sci., Shannxi (Li Gun; Hu Yong hui; Zhong Chong-xia)
Abstract	Two-way satellite time and frequency transfer (TWSTFT) and GPS C/A code based common view (GPS CV) are the two primary methods for international time and frequency transfer. TWSTFT technique has been made significant improvement in the last several years, and demonstrated to show a higher precision of T&F transfer than that of GPS CV. So it has been utilized for in the computation of TAI (international atomic time) and the GPS CV link is regarded as a back up if the links have both TWSTFT and GPS CV time transfer links. Actually, the TWSTFT is unavailable frequently for some unknown reasons or failure of instrument. More important, in some links, the comparison result of GPS CV has valuable information in the calculation of TAI and UTC (coordinated universal time). Considering these two cases, we have been used GPS CV C/A code and TWSTFT observations in attempt to form a more stable and reliable composite time transfer links. In this study we have focused on the unavailability when the system has malfunction or abnormality, in this case, the GPS CV data will be used in TAI computation which will cause a systematic error that should be deduct in some links. Finally, to avoid the above mentioned shortcomings, a new optimal algorithm for combining the two types time transfer data is given, the details of the optimal algorithm has been presented in this paper. A more stable and reliable time comparison result has been achieved in time comparison between some national time laboratories. The UTC(USNO)-UTC(PTB) and the UTC(ROA)-UTC(PTB) are given as a example
Starting Page	642
Ending Page	648
File Size	1348467
Page Count	7
File Format	PDF
ISBN	1424400740
DOI	10.1109/FREQ.2006.275463
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-06-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Global Positioning System Laboratories Modems Instruments Atomic clocks Frequency domain analysis Artificial satellites Transponders Performance evaluation Ionosphere composite time transfer time and frequency time transfer GPS common view TWSTFT algorithm
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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