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《Science of Surveying and Mapping》 2015-12
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Investigation of Earth Gravitational Model(EGM)based on time-varying GNSS/leveling

DING Jian;ZHANG Chuan-yin;XU Hou-ze;Chinese Academy of Surveying and Mapping;University of Chinese Academy of Sciences;Institute of Geodesy and Geophysics,CAS;  
It is a common external precision evaluation method of earth gravitational model(EGM),which is GNSS/leveling.Due to various reasons,the geoid difference between GNSS/leveling and EGM is about several decimeters and even greater.Using mathematical method can get rid of main system deviation,but it also hides the time-varying effect,regional differences and other factors.This paper proposed a modified evaluation approach of EGM by GNSS/leveling,which was based on the analysis of GNSS measurement time-varying effect,regional difference between global geoid and leveling benchmark.
【CateGory Index】: P228.4;P223
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