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GOCE kinematic orbit adjustment for EGM validation and accelerometer calibration

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Abstract

The main principle and mathematical model of GOCE kinematic orbit adjustment for Earth gravity field model (EGM) validation and accelerometer calibration are presented. Based on 60 days GOCE kinematic orbits with 1–2 cm accuracy and accelerometer data from 2009-11-02 to 2009-12-31, the RMS-of-fit (ROF) of them using EGM2008, EIGEN-5C, ITG-GRACE2010S and GOCO01S up to 120, 150 and 180 degree and order (d/o) are evaluated and compared. The scale factors and biases of GOCE accelerometer data are calibrated and the energy balance method (EBM) is performed to test the accuracy of accelerometer calibration. The results show that GOCE orbits are also sensitive to EGM from 120 to 150 d/o. The ROFs of EGMs with 150 and 180 d/o are obviously better than those of EGMs with 120 d/o. The ROFs of GOCO01S and ITG-GRACE2010S are almost the same up to 120 and 150 d/o, which are about 3.3 cm and 1.8 cm, respectively. They are far better than those of EGM2008 and EIGEN-5C with the same d/o. The ROF of GOCO01S with 180 d/o is about 1.6 cm, which is the best one among those EGMs. The accelerometer calibration accuracies (ACAs) of ITG-GRACE2010S and GOCO01S are obviously higher that those of EGM2008 and EIGEN-5C. The ACA of GOCO01S with 180 d/o is far higher than that of EGMs with 120 d/o, and a little higher than that of ITG-GRACE2010S with 150 d/o. It is suggested that the newest released EGM such as GOCO01S or GOCO02S till at least 150 d/o should be chosen in GOCE precise orbit determination (POD) and accelerometer calibration.

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Authors and Affiliations

  1. State Key Laboratory of Geo-information Engineering (Changan University), Xi’an, 710054, China

    Tian-he Xu  (徐天河)

  2. Xi’an Research Institute of Surveying and Mapping (Changan University), Xi’an, 710054, China

    Tian-he Xu  (徐天河)

  3. State Key Laboratory of Geodesy and Earth’s Dynamics, Wuhan, 430077, China

    Tian-he Xu  (徐天河)

  4. College of Geology Engineering and Surveying, Changan University, Xi’an, 710054, China

    Zhang-zhen Sun  (孙张振), Nan Jiang  (江楠), Kang-kang Chen  (陈康康) & Min Li  (李敏)

Authors
  1. Tian-he Xu  (徐天河)
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  2. Zhang-zhen Sun  (孙张振)
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  3. Nan Jiang  (江楠)
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  4. Kang-kang Chen  (陈康康)
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  5. Min Li  (李敏)
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Correspondence to Tian-he Xu  (徐天河).

Additional information

Foundation item: Project(41174008) supported by the National Natural Science Foundation of China; Project(SKLGED2013-4-2-EZ) supported by the Open Foundation of State Key Laboratory of Geodesy and Earth’s Dynamics, China; Project(2007B51) supported by the Foundation for the Author of National Excellent Doctoral Dissertation of China

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Xu, Th., Sun, Zz., Jiang, N. et al. GOCE kinematic orbit adjustment for EGM validation and accelerometer calibration. J. Cent. South Univ. 21, 2397–2403 (2014). https://doi.org/10.1007/s11771-014-2193-z

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  • DOI: https://doi.org/10.1007/s11771-014-2193-z

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