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  1. No Access

    Article

    GPS satellite clock determination in case of inter-frequency clock biases for triple-frequency precise point positioning

    Significant time-varying inter-frequency clock biases (IFCBs) within GPS observations prevent the application of the legacy L1/L2 ionosphere-free clock products on L5 signals. Conventional approaches overcomin...

    Jiang Guo, Jianghui Geng in Journal of Geodesy (2018)

  2. Article

    Open Access

    Toward global instantaneous decimeter-level positioning using tightly coupled multi-constellation and multi-frequency GNSS

    Autonomous driving represents one of the emerging applications that require both high-precision positions and highly critical timeliness to reach stringent safety standards. We develop a method to potentially ...

    Jianghui Geng, Jiang Guo, Hua Chang, **aotao Li in Journal of Geodesy (2019)

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  3. No Access

    Article

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

    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 ...

    Jianghui Geng, Jiang Guo, **aolin Meng, Kefu Gao in Journal of Geodesy (2020)

  4. No Access

    Article

    Beyond three frequencies: an extendable model for single-epoch decimeter-level point positioning by exploiting Galileo and BeiDou-3 signals

    GNSS is indispensable to self-driving vehicles by delivering decimeter-level or better absolute positioning solutions. Such a high precision normally requires a convergence time spanning seconds to minutes, wh...

    Jianghui Geng, Jiang Guo in Journal of Geodesy (2020)

  5. No Access

    Article

    Satellite antenna phase center errors: magnified threat to multi-frequency PPP ambiguity resolution

    The dearth of frequency-specific satellite antenna phase centers (APCs), such as GPS Block IIF L5 phase center offsets (PCOs) and BeiDou System (BDS) phase variations (PVs), inconveniences multi-frequency prec...

    Jianghui Geng, Jiang Guo, Chen Wang, Qiyuan Zhang in Journal of Geodesy (2021)

  6. No Access

    Article

    3D-map**-aided PPP-RTK aiming at deep urban canyons

    As a hot topic in the GNSS community in recent years, PPP-RTK integrates the advantages of PPP and RTK, aiming to quickly realize centimeter-level single point positioning with ambiguity resolution. However, P...

    Shaoming **n, Jianghui Geng, Guohao Zhang, Hoi-Fung Ng, Jiang Guo… in Journal of Geodesy (2022)