Acta Geodaetica et Cartographica Sinica >

2017 , Vol. 46 >Issue 10: 1308 - 1315

DOI: https://doi.org/10.11947/j.AGCS.2017.20170380

Algorithm Characteristics of Dynamic Approach-based Satellite Gravimetry and Its Improvement Proposals

  • SHEN Yunzhong
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  • College of Surveying and Geo-informatics, Tongji University, Shanghai 200092, China

Received date: 2017-07-04

  Revised date: 2017-08-11

  Online published: 2017-10-26

Supported by

The National Natural Science Foundation of China(No. 41474017);The Strategic Priority Research Program of the Chinese Academy of Sciences(No. XD1323030100);The Program of Application and Demonstration System of High Resolution Remote Sensing in Surveying and Mapping.

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Abstract

By using the integration equation for computing satellite orbit, this paper derives the observational equation for computing gravity field model linearized with respect to the reference orbit, provides the integration equation of calculating the design matrices of the observational equation, and clarifies that the dynamic approach is in principle the perturbation method relative to the reference orbit, therefore the initial partial derivatives with respect to the force model parameters must be zero. Based on the derived formulae this paper analyzes the main characteristics of dynamic approach-based observational equation, i.e. the linearization error will rapidly increase and the property of observational equation becomes worse as the integration arc extends longer, and the numerical integration error will be the bottle-neck problem for the data processing of next generation of satellite gravity exploration. Then this paper proposes the methods for improving the accuracy of gravity recovery, which can be summarized as that refining the linearization method relative kinematic orbit to reduce the linearization error, modifying parameterization method to improve the property of observational equation, and combined using analytic formula and numerical integration formula to increase the accuracy of orbit computation.

Key words： satellite gravimetry; dynamic approach; orbit integration; analytic orbit; linearization method

Cite this article

SHEN Yunzhong . Algorithm Characteristics of Dynamic Approach-based Satellite Gravimetry and Its Improvement Proposals[J]. Acta Geodaetica et Cartographica Sinica, 2017 , 46(10) : 1308 -1315 . DOI: 10.11947/j.AGCS.2017.20170380

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