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《Journal of Tongji University》 2000-04
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New Solution for Improving Precision of GPS Levelling

SHI Yi min, ZHANG Wen - qing, SHI Bao-xiang (Department of Surveying and Land Information Engineering , Tongji University ,Shanghai 200092, China) (Ningbo Surveying and Mapping Institute, Ningbo 315040, China)  
In order to improve the precision of GPS levelling, this paper puts forward a new solusion, in which the regional ellipsoidal surface is more coincident with the quasi - geoid by means of adjusting orientation of the E3 ellipsoid in several GPS points with known normal height. This surface of regional ellipsoid can be then fit by quadric surface. Compared with the prevenient solutions, this new one can proffer more precise normal height. It has been demonstrated by the application to Ningbo GPS control network.
【Fund】: 国家自然科学基金!(49971067)
【CateGory Index】: P228
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