对流层延迟改正中投影函数的研究

ANALYSIS OF MAPPING FUNCTION IN TROPOSPHERE DELAY CORRECTION

投影函数是对流层延迟改正中的重要组成部分,选择一个高精度的投影函数模型对提高数据处理的精度具有十分重要的意义。列举了现有的高精度对流层延迟模型投影函数,并利用SCIGN、PBO和IGS中的部分测站组成的GPS观测网数据,使用GAMIT软件,从输入值的角度对各投影函数进行分析、对比。结果表明:Niell和GMF模型精度较高,且GMF模型更适合在亚洲地区使用。

Mapping function is one of the most important parts in troposphere delay correction. Selecting a high-precision mapping function has great significance for data processing. Some mapping functions of high-precision troposphere delay correction models are listed,analyzed by use of the GPS observation network data composed by SCIGN, PBO and IGS partial stations and compared with each other from the viewpoint of input values with GAMIT software. The results indicate that the accuracies of Niell and GMF models are perfect, and GMF model is fitter to be used in Asian areas.