Modeling method of tropospheric delay for arid-areas including sandy, gobi and desert regions based on gnss

Abstract

The provided is a modeling method of tropospheric delay for arid-areas including sandy, gobi and desert regions based on GNSS. The modeling method incudes: obtaining a troposphere zenith hydrostatic delay ZHD and a troposphere zenith wet delay ZWD by utilizing a GPT-3 model, and summing to obtain a troposphere zenith total delay ZTD; inversely calculating the ZTD by utilizing a ground-based GNSS, obtaining a high-precision ZWD inversed by the GNSS by calculating a difference between the ZTD and the troposphere zenith hydrostatic delay ZHD obtained by a Saastamonien model, inversely calculating an atmospheric weighted average temperature T'by utilizing an ERA5 data set, performing linear correction to obtain a corrected temperature T, and calculating a priori value ZWDof the high-precision ZWD; and correcting the ZWD, and adding the corrected ZWDwith the ZHD to obtain a corrected value of the high-precision ZTD.