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  Characteristics of inter-frequency clock bias for Block IIF satellites and its effect on triple-frequency GPS precise point positioning

Pan, L., Zhang, X., Li, X., Liu, J., Li, X. (2017): Characteristics of inter-frequency clock bias for Block IIF satellites and its effect on triple-frequency GPS precise point positioning. - GPS Solutions, 21, 2, 811-822.
https://doi.org/10.1007/s10291-016-0571-8

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 Creators:
Pan, Lin1, Author
Zhang, Xiaohong1, Author
Li, Xingxing2, Author              
Liu, Jingnan1, Author
Li, Xin1, Author
Affiliations:
1External Organizations, ou_persistent22              
21.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146025              

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 Abstract: The latest generation of GPS satellites, termed Block IIF, provides a new L5 signal. Multi-frequency signals open new prospects for precise positioning and fast ambiguity resolution and have become the trend in Global Navigation Satellite System (GNSS) development. However, a new type of inter-frequency clock bias (IFCB), i.e., the difference between the current clock products computed with L1/L2 and the satellite clocks computed with L1/L5, was noticed. Consequently, the L1/L2 clock products cannot be used for L1/L5 precise point positioning (PPP). In order to solve this issue, the IFCB should be estimated with a high accuracy. Datasets collected at 129 globally distributed Multi-GNSS Experiment (MGEX) stations from 2015 are employed to investigate the IFCB. The results indicate that the IFCB is satellite dependent and varies with the relative sun–spacecraft–earth geometry. Other factors, however, may also contribute to the IFCB variations according to the harmonic analysis of the single-day IFCB time series. In addition, the results show that the IFCB exhibits periodic signal with a notable period of 43,080 s and the peak-to-peak amplitude is 0.023–0.269 m. After considering a time lag of 240 s, the average cross-correlation coefficient between the IFCB series of two consecutive days is 0.943, and the prediction accuracy of IFCB is 0.006 m. A triple-frequency PPP model that takes the IFCB into account is proposed. When using 3-h datasets, the positioning accuracy of triple-frequency PPP can be improved by 19, 13 and 21 % compared with the L1/L2-based PPP in the east, north and up directions, respectively.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: DOI: 10.1007/s10291-016-0571-8
GFZPOF: p3 PT1 Global Processes
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Title: GPS Solutions
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 21 (2) Sequence Number: - Start / End Page: 811 - 822 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals196