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GPS/Galileo/BDS phase bias stream from Wuhan IGS analysis center for real-time PPP ambiguity resolution

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Abstract

While few phase bias streams are available from the IGS Real-time Service Phase, such products are essential to enable PPP ambiguity resolution. Satellite phase biases and clocks should be estimated when fixing undifferenced ambiguities in a network solution, which is troublesome in real time and thus usually not done in practice. This study estimates real-time GPS/Galileo/BDS ambiguity-fixed multi-frequency raw phase biases from GNSS observation modeling. Multi-frequency narrow-lane and wide-lane uncalibrated phase delays (UPDs) are first extracted from the float ambiguities of the stations. Multi-frequency raw ambiguities are then resolved to form unambiguous carrier-range observations. Finally, the satellite phase observable-specific signal biases (phase OSBs) are estimated directly from the real-time network data processing using carrier-range observations only. The approach has been applied to generate real-time phase bias products at the Wuhan IGS analysis center. Real-time products are routinely calculated by 180 globally distributed stations. This study validates the approach and associated products using one week of data. The results show that triple-frequency kinematic PPP-AR based on the ambiguity-fixed phase OSBs can converge in 7.2 min on average, while those based on UPD products take 11.2 min to converge. The other software, PRIDE PPP-AR is used to validate the high-precision static positioning performance of the real-time OSB products. The results show that 82%, 85% and 76% of GPS, Galileo and BDS-3 narrow-lane ambiguities can be resolved successfully among global stations, achieving a mean positioning accuracy of 3.1, 3.0 and 6.0 mm for the east, north and up components.

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Data availability

The real-time products can be received from IGS ntrip caster on mountpoint SSRC00WHU0 for orbit/clock SSR, OSBC00WHU1 for code/phase OSBs. All of the real-time products are saved as files adapted to IGS convention, which can be downloaded on ftp://igs.gnsswhu.cn/pub/whu/phasebias

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Acknowledgements

This work is funded by the National Science Foundation of China (42025401) and the National Key R&D Program of China (2022YFB3903800). We thank IGS for the raw GPS/Galileo/BDS multi-frequency data streams and high-quality satellite orbit/clock streams from the real-time service.

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Authors and Affiliations

  1. GNSS Research Center, Wuhan University, Wuhan, China

    Jiang Guo, Jianghui Geng & Jing Zeng

  2. Royal Observatory of Belgium, Brussel, Belgium

    Jiang Guo & Pascale Defraigne

  3. Key Laboratory of Roads and Railway Engineering Safety Control, Shijiazhuang Tiedao University, Ministry of Education, Shijiazhuang, China

    Xiangyu Song

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  1. Jiang Guo
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  2. Jianghui Geng
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  3. Jing Zeng
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  4. Xiangyu Song
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  5. Pascale Defraigne
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Contributions

JHG devised the project and the main conceptual ideas; JG carried out the research and drafted the manuscript; JHG, JG and PD worked out all technical details; JZ and XS provided some of the calculation results; all of the authors reviewed and approved the manuscript.

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Correspondence to Jianghui Geng.

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Guo, J., Geng, J., Zeng, J. et al. GPS/Galileo/BDS phase bias stream from Wuhan IGS analysis center for real-time PPP ambiguity resolution. GPS Solut 28, 67 (2024). https://doi.org/10.1007/s10291-023-01610-6

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