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GPS/gravity boundary value problem and its practical formula

ZHANG Li-ming1,LI Fei2,ZHANG Chuan-yin1(1.Chinese Academy of Surveying and Mapping,Beijing 100039,China; 2.National Lab.for Information Engineering in Surveying and Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China)  
Based on the approximate solution of the GPS/gravity boundary value problem(BVP),we deduce the practical formula which has a simple form and clear physical meanings.Meanwhile,using the Taylor series expression of gravity disturbances,we directly prove the correctness of the practical formula and analyze its physical implication in detail.It is very important for the variety of data that vertical gradient of gravity disturbances is introduced in the practical formula.
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