Bulletin of Surveying and Mapping ›› 2023, Vol. 0 ›› Issue (3): 44-48,103.doi: 10.13474/j.cnki.11-2246.2023.0070

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GNSS-PWV calculation method based on the GPT-3 model

GAO Ying1, XU Siyi1, LI Li1,2, LU Houxian1, HE Qimin1,2, WANG Xiaoming2,3   

  1. 1. School of Geography Science and Geomatics Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
    2. Research Center of BeiDou Navigation and Environmental Remote Sensing, Suzhou University of Science and Technology, Suzhou 215009, China;
    3. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
  • Received:2022-06-04 Published:2023-04-04

Abstract: To solve the problem that precipitable water vapor (PWV) can't be calculated in real time without the measured meteorological parameters at some GNSS stations,taking the Yangtze River Delta region as an example, a new method to obtain high-precision PWV by combining GPT3 model with GNSS-ZTD is proposed in this paper. The results show that the meteorological parameters and some tropospheric delay parameters of GPT3 model have good stability and accuracies in the Yangtze River Delta region. The RMS of PWV obtained by integrating the parameters (ZHD and Tm) of GPT3 model and GNSS-ZTD is 3.56 mm, which is close to GNSS-PWV (3.74 mm), and is far superior to GPT3-PWV (11.12 mm).

Key words: GNSS, PWV, GPT3 model, fusion

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