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《Progress in Geophysics》 2012-01
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The methods and accuracy analysis of GPS height transformation based on EGM2008 earth gravity field model

ZHANG Xing-fu1,LIU Cheng2,WANG Guo-hui1,KANG Zhan-long2,YAN Hai-bo2(1.Department of Surveying and Geomatics,Guangdong University of Technology,Guangzhou 510006,China; 2.Dept.of Surveying and Mapping,Third Surveying and Design Institute L td.Comp.,Tianjin,300251,China)  
The methods of direct GPS height transformation based on Earth gravity field model are discussed in this paper.They include height anomaly method and gravity potential method.The error formulae of height anomaly and normal height are derived from the coefficient's variance of Earth gravity field based on error propagation rules,and the factors effecting on the GPS height transformation precision for two methods are analyzed.Based on the two methods,the test and accuracy analysis are carried out with GPS/leveling data and representative model EGM96,EIGEN-51C and EGM2008.The results show that the two transformation methods are equivalent from the theoretical formulae and test results;the systematic bias may be corrected during the GPS height transformation;the accuracy and resolution of EGM2008 model is higher than EGM96 and EIGEN-51C,in local region,the centimeter-level accuracy may be achieved for GPS height transformation with EGM2008.
【Fund】: 中国科学院动力大地测量学重点实验室开放基金(L09-07)资助
【CateGory Index】: P228.4
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