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Non-tidal sounding technology based on EGM 2008 model

FENG Guozheng;CAO Lei;MA Yaochang;SUN Zhenyong;ZOU Min;HUANG Anshu;Upper Changjiang River Bureau Hydrological and Water Resources Survey;  
According to the accuracy and complexity of the non-tidal sounding height datum conversion,this paper presents a non-tidal sounding technique based on EGM 2008 model,so as to solve the height datum conversion problem that instantaneous measured by GNSS height on WGS-84 reference ellipsoid to the normal height.After testing,EGM can only use a small number of control points to correct the system deviation,and can meet the low level of leveling accuracy in the long distance.The coordinate transformation error and non-tidal sounding measurement accuracy reach to the centimeter level by apply the EGM model to the non-tidal sounding measurement,and the bottleneck of no-test deep elevation datum conversion is exceeded,and the real-time,high efficiency and high precision without tide measurement is realized.
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