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《Engineering of Surveying and Mapping》 2008-03
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Study on the methed of GPS leveling using remove-restore technology to approach the geoid

LIU Xiao-gang1,LIU Yan-yu2,CAO Ji-dong2,WANG Li-hong1,PANG Zhen-xing1,CHEN Shao-ming1(1.Institute of Surveying and Mapping,Information Engineering University,Zhengzhou 450052,China;2.61081 troops,Beijing 100094,China)  
Refining the local geoid is an important task of the research on the gravity field and the geodetic surveying.In this paper,it discusses the method of the GPS leveling using the "remove-restore" technique to interpolate the geoid difference or the height abnormal value.EGM96 model is used for calculating height abnormal value of any points on the earth surface.When calculating the coefficients of interpolation model of the local height abnormal value,the height abnormal value on the known points is removed firstly by EGM96,the remained value is used for calculating the interpolation coefficients,then the height abnormal value of any point is calculated by the obtained interpolation model and added by the height abnormal value calculated by EGM96.This method has been used in a local area,the improvements of the height abnormal value obtained are not very significant.But for the large area,this method should be useful for the refinement of geoid.
【CateGory Index】: P228.4
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