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Characteristics of phase bias from CNES and its application in multi-frequency and multi-GNSS precise point positioning with ambiguity resolution

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Abstract

While precise point positioning ambiguity resolution (PPP AR) is a valuable tool of the multi-constellation global navigation satellite system (multi-GNSS), phase biases are critical to implement PPP AR. Multi-frequency phase biases and satellite attitude files are provided freely by Centre National d’Etudes Spatiales (CNES), which are estimated based on GeoForschungs Zentrum (GFZ) satellite rapid orbit and clock products. However, the temporal characteristics of these phase biases and their positioning performance in the multi-frequency and multi-GNSS PPP AR have not been investigated yet, especially in the low sun elevation and satellite maneuver period. We introduce the transformation between multi-frequency phase biases and integer recovery clock model. In this transformation, inter-frequency clock biases (IFCBs) and inconsistencies in satellite attitude model errors between GFZ and CNES products are well considered. Experiments with GPS/Galileo/BeiDou observations from 34 stations were performed in static and kinematic modes, and the multi-frequency phase residuals were analyzed in the low sun elevation. Our results show that the impact of IFCBs and inconsistencies in satellite attitude errors could be mitigated at the user ends by using phase biases and satellite attitude files. Under the condition of satellite reverse yaw maneuvers, the performance of kinematic PPP without phase biases or deleting maneuvering satellites would be degraded significantly until the end of satellite observation arc or the next reverse yaw maneuver occurs. By applying phase biases with PPP AR, the positioning accuracy could be improved by 34.4%, 23.1%, and 37.4% in the east (E), north (N), and up (U) directions, respectively. Therefore, we suggested that PPP users should apply phase biases and satellite attitude files when using the GFZ rapid orbit and clock products, especially for satellite maneuvers and low sun elevation.

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Data Availability

The availability of multi-frequency phase biases and satellite attitude files is provided freely by CNES (www.ppp-wizard.net/ products/POST_PROCESSED). The rapid orbit and clock products are provided freely by GFZ (ftp://ftp.gfz-potsdam.de/pub/GNSS/products/mgnss). GNSS data, IGS SINEX weekly solutions files, and igs_2084.atx files are provided freely by IGS and MGEX (https://cddis.nasa.gov/archive/gps/data/daily).

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Acknowledgments

The authors gratefully acknowledge IGS MGEX for providing GNSS data. We also acknowledge the GFZ and CNES for providing precise products. This research was funded by Natural Science Innovation Group Foundation of China (No. 41721003), National Science Fund for Distinguished Young Scholars (No. 41525014), National Key Research and Development Program of China (2018YFC1503600), National Dam Safety Research Center (Grant No. CX2019B05), National Nature Science Foundation of China (No. 41704030), and Opening Foundation of Hunan Engineering and Research Center of Natural Resource Investigation and Monitoring (2020-4).

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Authors and Affiliations

  1. GNSS Research Center, Wuhan University, 129 Luoyu Road, Wuhan, 430079, China

    Tianjun Liu, Qusen Chen, Weiping Jiang, Xiangdong An & Tao Geng

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

    Hua Chen

  3. Centre National D’Etudes Spatiales, 14 avenue Edouard Belin, 31400, Toulouse, France

    Denis Laurichesse

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  1. Tianjun Liu
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  2. Hua Chen
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  3. Qusen Chen
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  5. Denis Laurichesse
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  7. Tao Geng
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Correspondence to Qusen Chen.

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Liu, T., Chen, H., Chen, Q. et al. Characteristics of phase bias from CNES and its application in multi-frequency and multi-GNSS precise point positioning with ambiguity resolution. GPS Solut 25, 58 (2021). https://doi.org/10.1007/s10291-021-01100-7

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