Abstract：We use precise point positioning(PPP) technology to process the ground-based GNSS observation data of Guizhou to obtain high-precision zenith tropospheric delay(ZTD), and then carry out the water vapor inversion to obtain precipitable water vapor(PWV). Based on the slant-path water vapor(SWV), we use the adaptive simultaneous iterative reconstruction technique for 3D water vapor tomography, with spatial resolution better than 30 km×30 km, and time resolution of 5 min. The RMS is 3.55 mm and 1.03 mm respectively when the radiosonde data is used as a reference to evaluate the accuracy of ZTD and PWV. Using ERA5 reanalysis data as a reference to evaluate the accuracy of 3D water vapor tomography, the relative error is less than 10%, and the maximum deviation is 1.03 g/m3 when there is no rainstorm. Using radiosonde data as a reference to evaluate the accuracy of 3D water vapor tomography, the correlation coefficient between tomography results and radiosonde data is above 0.97, with good consistency. The average RMS of Guiyang station and Weining station is better than 0.5 g/m3 and 1.2 g/m3 respectively.
YAO Xiuguang,GUO Jincheng,YAN Mengqi et al. Accuracy Analysis of Water Vapor Tomography Based on Ground-Based GNSS Observation Data in Guizhou Plateau[J]. jgg, 2023, 43(11): 1162-1166.
