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《Science of Surveying and Mapping》 2007-04
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Research on tropospheric delay modeling technology based on GPS/VRS reference station network

LI Cheng-gang, HUANG Ding-fa, ZHOU Le-tao, Xiong Yong-liang, XU Rui(The Center of Geomatic Engineering, Southwest Jiaotong University, Chengdu 610031, China)  
The unmodelled residuals of tropospheric delay increase in mountainous area due to the height differences between the reference stations and rovers,which is specified as one of the main influence to the tropospheric correction accuracy in GPS/VRS real-time dynamic positioning. A network-based error reduction approach, i.e. “modified height and distance-based linear interpolation method (MHDIM)”, is proposed and the apriori tropospheric models are applied in this network approach to recover the homogeneous spatial correlation characteristic of the tropospheric delay. Test data acquired from SGRSN (Sichuan GPS reference station network) show that correction accuracy of 2 to 3 centimeter is reached over sparse networks with MHDIM. Furthermore, RTK field test shows that long range real-time dynamic differential GPS positioning at cm-level can be considerably improved when the proposed models are used.
【Fund】: 国家自然科学基金项目(No:40271091);; 教育部博士点基金资助项目(20040613025);; 教育部优秀教师资助计划(No:2003109)
【CateGory Index】: P228.4;P405
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