NDLI: Research on a method of real-time combination of precise GPS clock corrections

Content Provider	Springer Nature Link
Author	Chen, Liang Song, Weiwei Yi, Wenting Shi, Chuang Lou, Yidong Guo, Hailin
Copyright Year	2016
Abstract	The acquisition of real-time satellite orbit and clock corrections is necessary for real-time PPP. There are nine International GNSS Service (IGS) analysis centers (ACs) that provide real-time satellite orbit and clock products. Given the influence of network transmission, observation data and solution methods, a single AC product suffers from outages and outliers. A combination of real-time data streams is an effective method of improving these problems. We focus on a combination method with regard to anomalous data in a single AC solution. Processing techniques such as parameter separation, weight estimation and exception handling are proposed. Experimental results indicate that, after the process, the frequency of unavailability and anomaly in the combined (simply COMB later) clock correction obtained using the above-mentioned method decreases relative to that of a single AC and IGS01 and IGS02 products. IGS01 is a single-epoch combined product provided by European Space Agency (ESA). IGS02 is a Kalman filter combined product provided by the Federal Agency for Cartography and Geodesy (BKG). In a 7-day experimental period, the performance of real-time products is also examined regarding availability and accuracy. The availability of COMB is as high as 99.9 %, which is superior to that of single AC and IGS01 and IGS02 products. The accuracy of COMB is 0.15 ns in standard deviation, which is at the same level as the Centre National d’Etudes Spatiales (CNES) product, but higher by 40, 17, 29, 42 and 32 % than that of the German Aerospace Center (DLR), ESA, GeoForschungsZentrum (GFZ), IGS01 and IGS02 products. The 3D positioning accuracy applying COMB product is 9.1 cm in root mean square (RMS), which is higher by 41, 44, 5, 43, 43 and 42 % than applying CNES, DLR, ESA, GFZ, IGS01 and IGS02 products, respectively. The results demonstrate that the real-time COMB clock correction obtained by the method proposed is more stable and reliable than single AC and IGS01 and IGS02 products.
Starting Page	187
Ending Page	195
Page Count	9
File Format	PDF
ISSN	10805370
Journal	GPS Solutions
Volume Number	21
Issue Number	1
e-ISSN	15211886
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-01-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Real-time Precise clock corrections Combination Exception handling Parameter separation Geophysics/Geodesy Atmospheric Sciences Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics) Automotive Engineering Electrical Engineering
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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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