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  1. Article

    Open Access

    Global zenith wet delay modeling with surface meteorological data and machine learning

    The tropospheric delay is a major error source for space geodetic techniques, and the performance of its modeling is significantly limited due to the high spatiotemporal variability of the moisture in the lowe...

    Qinzheng Li, Johannes Böhm, Linguo Yuan, Robert Weber in GPS Solutions (2024)

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  2. No Access

    Article

    Modeling tropospheric zenith wet delays in the Chinese mainland based on machine learning

    In this study, the tropospheric zenith wet delay (ZWD) modeling was realized based on the regression analysis of 7 years (2013–2019) of radiosonde data at 182 sites in the Chinese mainland and the surroundings...

    Qinzheng Li, Linguo Yuan, Zhongshan Jiang in GPS Solutions (2023)

  3. No Access

    Article

    GNSS2TWS: an open-source MATLAB-based tool for inferring daily terrestrial water storage changes using GNSS vertical data

    Technological advances in global navigation satellite system (GNSS) offer a novel environmental sensor to measure terrestrial water cycles and provide independent constraints on total terrestrial water storage...

    Zhongshan Jiang, Ya-Ju Hsu, Linguo Yuan, Wei Feng, **nghai Yang, Miao Tang in GPS Solutions (2022)

  4. No Access

    Article

    Global grid-based Tm model with vertical adjustment for GNSS precipitable water retrieval

    Atmospheric weighted mean temperature, Tm, is a key parameter in ground-based GNSS precipitable water (PW) retrieval, especially for a real-time mode. Considering the seasonal variability of the Tm vertical gradi...

    Qinzheng Li, Linguo Yuan, Peng Chen, Zhongshan Jiang in GPS Solutions (2020)

  5. No Access

    Article

    Regularization and particle filtering estimation of phase inter-system biases (ISB) and the lookup table for Galileo E1-GPS L1 phase ISB calibration

    The between-receiver phase inter-system bias (ISB) in multi-GNSS integration needs to be calibrated when fixing the inter-system double difference (DD) ambiguities. As a result, the DD ambiguity fixing perform...

    Yumiao Tian, Linguo Yuan, Linyun Tan, Haoming Yan, Shaoguang Xu in GPS Solutions (2019)

  6. No Access

    Article

    Improvements on the particle-filter-based GLONASS phase inter-frequency bias estimation approach

    The carrier phase inter-frequency bias (IFB) of GLONASS between receivers of different types is usually not zero. This bias must be estimated and removed in data processing so that the integer double differenc...

    Yumiao Tian, Maorong Ge, Frank Neitzel, Linguo Yuan, Dingfa Huang… in GPS Solutions (2018)