A simple approach to estimating vertically integrated atmospheric water vapor, or
precipitable water, from Global Positioning System (GPS) radio signals collected by a
regional network of ground-based geodetic GPS receiver is illustrated and validated.
Standard space geodetic methods are used to estimate the zenith delay caused by the
neutral atmosphere, and surface pressure measurements are used to compute the
hydrostatic (or “dry”) component of this delay. The zenith hydrostatic delay is subtracted from …