GNSS PRECIPITABLE WATER VAPOR
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Abstract
This review article centers on tropospheric delays in Global Navigation Satellite System (GNSS) positioning and the methodology for estimating Zenith Total Delay (ZTD), which encompasses Zenith Hydrostatic Delay (ZHD) and Zenith Wet Delay (ZWD). The precise modeling and estimation of these delays are paramount for achieving high-precision GNSS positioning and valuable tools for tropospheric monitoring. The process of GNSS Precipitable Water Vapor (PWV) retrieval entails the calculation of ZWD by subtracting ZHD from ZTD. The Weighted Mean Temperature (Tm) stands out as a crucial parameter influencing the calculations of GNSS PWV, and the accuracy of GNSS PWV hinges on the precision of both Tm and ZHD.
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