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Speeding up PPP ambiguity resolution using triple-frequency GPS/BeiDou/Galileo/QZSS data

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Abstract

Precise point positioning (PPP) has been suffering from slow convergences to ambiguity-fixed solutions. It is expected that this situation can be relieved or even resolved using triple-frequency GNSS data. We therefore attempt an approach where uncombined triple-frequency GPS/BeiDou/Galileo/QZSS (Quasi-zenith satellite system) data are injected into PPP, whereas their raw ambiguities are mapped into the extra-wide-lane, wide-lane and narrow-lane combinations for integer-cycle resolution at a single station (i.e., PPP-AR). Once both extra-wide-lane and wide-lane ambiguities are fixed to integers, the resulting unambiguous (extra-)wide-lane carrier-phase can usually outweigh the raw pseudorange to improve the convergence of positions and narrow-lane ambiguities. We used 31 days of triple-frequency multi-GNSS data from 76 stations over the Asia Oceania regions and divided them into hourly pieces for real-time PPP-AR. We found that the positioning accuracy for the first 10 min of epochs could be improved by about 50% from 0.23, 0.18 and 0.43 m to 0.12, 0.08 and 0.27 m for the east, north and up components, respectively, once wide-lane ambiguity fixing was achieved for triple-frequency PPP. Consequently, 48% of PPP solutions could be initialized successfully with narrow-lane ambiguities resolved within 2 min, in contrast to only 26% for dual-frequency PPP. On average, 6 min of epochs were required to achieve triple-frequency PPP-AR, whereas 9 min for its dual-frequency counterpart. Of particular note, the more satellites contribute to triple-frequency PPP-AR, the faster the initializations will be; as a typical example, the mean initialization time declined to 3 min in case of 20–21 satellites. We therefore envision that only a few minutes of epochs will suffice to reliably initialize real-time PPP once all GPS, BeiDou, Galileo and QZSS constellations emitting triple-frequency signals are complete in the near future.

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Acknowledgements

This study is funded by National Key R&D Program of China (2018YFC1503601 and 2016YFB0501802) and National Science Foundation of China (41674033). We thank IGS (International GNSS Service), ARGN (Australian Regional GNSS Network) for the multi-GNSS data and the high-quality satellite products. The computation work was finished on the high-performance computing facility of Wuhan University.

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Authors and Affiliations

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

    Jianghui Geng, Jiang Guo & Kefu Gao

  2. Collaborative Innovation Center of Geospatial Technology, Wuhan, China

    Jianghui Geng, Jiang Guo & Kefu Gao

  3. Nottingham Geospatial Institute, University of Nottingham, Nottingham, UK

    Xiaolin Meng

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  1. Jianghui Geng
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  2. Jiang Guo
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  3. Xiaolin Meng
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  4. Kefu Gao
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Correspondence to Jianghui Geng.

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Geng, J., Guo, J., Meng, X. et al. Speeding up PPP ambiguity resolution using triple-frequency GPS/BeiDou/Galileo/QZSS data. J Geod 94, 6 (2020). https://doi.org/10.1007/s00190-019-01330-1

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