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Stabilization of Satellite Derived Gravity Field Coefficients by Earth Orientation Parameters and Excitation Functions

  • Andrea HeikerEmail author
  • Hansjörg Kutterer
  • Jürgen Müller
Conference paper
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 136)

Abstract

The time variable gravity field of the Earth is determined by GRACE and SLR. Different gravity field solutions reveal some discrepancies in the low degree coefficients, especially C 20. The second degree gravity field coefficients are directly related to the Earth’s unknown tensor of inertia as well as the mass terms of the excitation functions, which describe the effects of atmosphere and ocean on Earth rotation. A further relationship exists between the Earth orientation parameters (polar motion and length of day), the motion terms of the excitation functions and the tensor of inertia. Up to now these interdependencies are not used for the calculation of the gravity field coefficients. They can therefore be used to validate the various parameter groups mutually. More reliable second degree gravity field coefficients can possibly be obtained if the Earth orientation parameters and the excitation functions are taken into account. This paper presents a novel method to integrate Earth orientation parameters, excitation functions and gravity field coefficients in a least-squares adjustment model with additional condition equations. This leads to consistent time series.

Keywords

Excitation Function Polar Motion Bias Parameter Earth Orientation Parameter Partial Redundancy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgement

The results presented have been derived within the work on the project “Mutual validation of EOP and gravity field coefficients” within the research unit Earth Rotation and global geodynamic processes funded by the German Research Foundation (DFG FOR584: http://www.erdrotation.de). This is gratefully acknowledged.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Andrea Heiker
    • 1
    Email author
  • Hansjörg Kutterer
    • 1
  • Jürgen Müller
    • 2
  1. 1.Geodätisches InstitutLeibniz Universität HannoverHannoverGermany
  2. 2.Institut für ErdmessungLeibniz Universität HannoverHannoverGermany

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