不同全球对流层天顶延迟产品在中国区域的比较

用4种全球对流层天顶延迟格网产品计算我国区域内9个IGS(International GNSS Service)站的对流层天顶延迟,分析各产品的精度,包括对流层延迟高程归算方法、格网插值方法及其在不同区域的差异性.结果表明,不同插值方法的插值精度无明显差异,对流层延迟的高程归算精度与站点的高程离散度有关;UNB(University of New Brunswick)提供的不同格网产品精度相当,但与VMF1(Vienna Mapping Functions)产品有明显差异;各产品的插值精度在区域上不尽相同,且VMF1产品更稳定.

Comparison of Different Global Troposphere Zenith Path Delay Products in China

Four kinds of global grid troposphere zenith path delay products were used to interpolate the site troposphere zenith delay of nine IGS stations in China. We analyze the accuracy of products, zenith delay correction methods and grid interpolation methods in different regions. Results showed that 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 but obvious with VMFG product. The stability of VMFG product is relatively good.