Comparison of Different Global Troposphere Zenith Path Delay Products in China

Abstract:

Four kinds of global grid troposphere zenith path delay products were used to interpolate the troposphere zenith delays at nine International GNSS Service (IGS) stations in China. We evaluate the accuracy of products, including zenith delay correction methods and grid interpolation methods in different regions. Results show no significant accuracy difference between interpolation methods. Accuracy of zenith delay correction methods is affected by site elevation dispersion. Accuracy difference is little between products provided by University of New Brunswick (UNB) but obvious with Vienna Mapping Functions (VMF1) product. The stability of VMF1 product is relatively good.