GOCE Precise Orbit Determination Using Pure Dynamic Method and Reduced Dynamic Method
The basic principles and mathematical models for pure dynamic orbit determination and reduced dynamic orbit determination are reviewed briefly. The GOCE orbit determination accuracies of pure dynamic method (PDM) and reduced dynamic method (RDM) are compa
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GOCE Precise Orbit Determination Using Pure Dynamic Method and Reduced Dynamic Method Tianhe Xu, Min Li and Kangkang Chen
Abstract The basic principles and mathematical models for pure dynamic orbit determination and reduced dynamic orbit determination are reviewed briefly. The GOCE orbit determination accuracies of pure dynamic method (PDM) and reduced dynamic method (RDM) are compared using different gravity field model with different degree and order (d/o). The computational results show that the orbit accuracies of the two methods using GOCO02S is obviously higher than those of EIGEN-5C and a little superior to those of ITG-GRACE2010S with the same d/o. The orbit determination accuracies of PDM and RDM using gravity field model with 150 and 180 d/o are greatly higher than those with 120 d/o. The SST observation, common-mode acceleration and attitude quaternion from 16/11/2009 to 18/11/2009 are used for GOCE orbit determination. The results show that the orbit accuracy of using PDM is about 11 cm, which can meet the accuracy requirement of GOCE rapid science orbit (RSO). The orbit accuracy of using RDM is about 2.2 cm, which is very close to the accuracy requirement of GOCE precise science orbit (PSO). There is still space of accuracy improvement since the GOCE satellite antenna phase center variation (PCV) is not estimated and considered in PDM and RDM.
Keywords GOCE Precise orbit determination Reduced dynamic method
Pure dynamic method
T. Xu (&) State Key Laboratory of Geo-information Engineering, Xi’an, China e-mail: [email protected] T. Xu State Key Laboratory of Geodesy and Earth’s Dynamics, Wuhan, China M. Li K. Chen School of Geology Engineering and Surveying, Chang’an University, Xi’an, China T. Xu Xian Research Institute of Surveying and Mapping, Xi’an, China
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2013 Proceedings, Lecture Notes in Electrical Engineering 245, DOI: 10.1007/978-3-642-37407-4_19, Ó Springer-Verlag Berlin Heidelberg 2013
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19.1 Introduction The GOCE (Gravity Field and Steady-state Ocean Circulation Explorer) satellite was successfully launched on 17 March 2009. It is the first mission using gradiometry measurement to recover the Earth gravity field model (EGM) at least up to 240° and order (d/o) [1]. Due to the limitation of measuring bandwidth of GOCE satellite gradiometer, the ability to recover the low frequency information of EGM is poor. The GPS SST observations of GOCE satellite or GRACE data are used to determine the low-degree information of EGM. There are two types of GOCE orbits, kinematic orbits and reduced dynamic orbits released by ESA, whose accuracy is about 1–2 cm [2]. From the point of time latency, they can be classified into two types, rapid science orbit (RSO) and precise science orbit (PSO). RSO is usually used for the preprocessing of gradiometer data, quick-look of GOCE gravity field and the primary quality checking for GOCE data. It is provided by orbit determination workgroup of ESA just for interior
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