中文摘要：

利用36个全球分布的IGS站2003全年GPS实测的对流层天顶延迟数据和气象数据，对目前国内外常用的两个对流层延迟改正模型：Hopfield模型、Saastamoinen模型和最近几年发展起来的EGNOS模型的改正精度和适用范围进行评估，指出Hopfield模型在应用中存在的缺陷，EGNOS模型可用作GNSS实时定位和导航的对流层天顶延迟的改正模型．

英文摘要：

Based on the tropospheric data and meteorologic data of 36 stations provided by IGS in 2003, we evaluate the correction precision of Hopfield model, Saastamoinen model widely used at home and abroad at present and EGNOS model developed in recent years. The limitation of Hopfield model is pointed out. EGNOS model can be the correction model in the tropospheric delay for the real-time orientation and navigation.