Accuracy Analysis of GNSS Water Vapor Inversion Based on PPP and Double-Difference Network in China Region

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  • 1. Yunnan Atmospheric Observation Technology Support CentreKunming 650034YunnanChina
    2. CMA Meteorological Observation CentreBeijing 100081China
    3. School o f Electronic and In formation EngineeringBeihang UniversityBeijing 100191China
    4. Guangxi Meteorological Technical Equipment CenterNanning 530022GuangxiChina

Online published: 2025-06-26

Abstract

Using observation data from 945 ground-based Global Navigation Satellite SystemGNSSstations in the summer of 2023 in Chinathe double-differenceDDnetwork algorithm and Precise Point Positioning PPPalgorithm were used to invert the Precipitable Water VaporPWVof the atmosphere. The accuracy and stability characteristics of the two methods for inverting PWV in different climate regions of China were studied and analyzed using PWV from radiosonde stations at the same location and ERA5 reanalysis data as reference values. The results show that compared with the PPP solutionthe DD solution has a stronger correlation with the PWV of radiosonde and ERA5 dataa more concentrated bias frequency distributiona higher probability of peak areaand a smaller range of bias. Compared with the Radio-PWVthe average biases for the DD-PWV and PPP-PWV are -0. 1 mm and 1. 1 mmrespectivelyand the corresponding root mean square errorRMSEare 2. 4 mm and 3. 1 mmrespectively. While compared with the ERA5-PWVthe average Bias of the DD-PWV and PPP-PWV are -0. 2 mm and 0. 1 mmrespectivelyand the corresponding RMSE are 2. 7 mm and 3. 2 mmrespectively. The average RMSE of the DD solution is less than 3 mmindicating that the PWV inverted by the DD network method has higher accuracy and stability. The accuracy of GNSS detection of water vapor is generally better in the western non monsoon region than in the eastern monsoon region. The RMSE of the DD solution is more concentrated around the median in various climate regionswhile the PPP solution shows different levels of accuracy at different GNSS stations. The PPP solution has a greater degree of dispersion in accuracy and strong instability in temperate and subtropical monsoon climate regions with sufficient water vapor and low detection accuracy.

Cite this article

LUO Jin, CAO Yunchang, XU Balin, LIANG Hong, ZHOU Linghao, WANG Yizhu, LIANG Jingshu . Accuracy Analysis of GNSS Water Vapor Inversion Based on PPP and Double-Difference Network in China Region[J]. Plateau Meteorology, 0 : 1 . DOI: 10.7522/j.issn.1000-0534.2025.00011

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