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GREAT-UPD: An open-source software for uncalibrated phase delay estimation based on multi-GNSS and multi-frequency observations

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Abstract

To meet the demands of precise orbit and clock determination, high-precision positioning, and navigation applications, a software called GREAT (GNSS + Research, Application and Teaching) was designed and developed at Wuhan University. As one important module in the GREAT software, GREAT-UPD was developed for multi-GNSS and multi-frequency uncalibrated phase delay (UPD) estimation. It can provide extra-wide-lane (EWL), wide-lane (WL), and narrow-lane (NL) UPDs for GPS, GLONASS, Galileo and BDS (GREC) satellites for precise point positioning (PPP) ambiguity resolution (AR) in a multi-GNSS and multi-frequency environment. The open-source GREAT-UPD software is written in C + + 11 language following object-oriented principles and can be compiled and run on several popular operating systems, such as Windows, Linux, and Macintosh. Observations from 222 stations spanning days from DOY 091 to 120 were used to conduct multi-GNSS and multi-frequency UPD estimation and PPP AR. Results indicate that GREAT-UPD can generate stable and reliable UPD products with multi-GNSS and multi-frequency observations. After applying the UPD corrections, the multi-frequency GREC PPP AR was achieved with the averaged time to first fix of 9.0 min. The software package can be obtained at https://geodesy.noaa.gov/gps-toolbox, including the source code, user manual, batch processing scripts, example data, and some auxiliary tools.

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Acknowledgements

This work has been supported by the National Natural Science Foundation of China (Grant 41774030, Grant 41974027 and Grant 41974029), the Hubei Province Natural Science Foundation of China (Grant 2018CFA081), the frontier project of basic application from Wuhan science and technology bureau (Grant 2019010701011395), and the Sino-German mobility program (Grant No. M0054). The numerical calculations in this paper have been done on the supercomputing system in the Supercomputing Center of Wuhan University.

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Authors and Affiliations

  1. School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan, 430079, China

    Xingxing Li, Xinjuan Han, Xin Li, Gege Liu, Guolong Feng, Bo Wang & Hongjie Zheng

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  1. Xingxing Li
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  2. Xinjuan Han
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  3. Xin Li
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  4. Gege Liu
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  5. Guolong Feng
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  6. Bo Wang
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  7. Hongjie Zheng
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Correspondence to Xin Li.

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The GPS Tool Box is a column dedicated to highlighting algorithms and source code utilized by GPS engineers and scientists. If you have an interesting program or software package you would like to share with our readers, please pass it along; e-mail it to us at gpstoolbox@ngs.noaa.gov. To comment on any of the source code discussed here, or to download source code, visit our website athttp://www.ngs.noaa.gov/gps-toolbox . This column is edited by Stephen Hilla, National Geodetic Survey, NOAA, Silver Spring, Maryland, and Mike Craymer, Geodetic Survey Division, Natural Resources Canada, Ottawa, Ontario, Canada.

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Li, X., Han, X., Li, X. et al. GREAT-UPD: An open-source software for uncalibrated phase delay estimation based on multi-GNSS and multi-frequency observations. GPS Solut 25, 66 (2021). https://doi.org/10.1007/s10291-020-01070-2

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