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Quality Assessment of GOCE Gradients

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Book cover Observation of the Earth System from Space

Summary

To meet the accuracy requirements of the GOCE mission, the gradiometer has to be calibrated and validated internally as well as externally. An internal quality assessment of the observed GOCE data is possible by comparisons of observations at the same satellite position, i.e. at satellite track cross-overs. Due to the orbit characteristics of the mission, satellite ground track cross-overs have to be used instead of identical repeat positions. Therefore, an appropriate reduction concept has to be applied to consider the differences caused by different satellite altitudes and orientations. It is shown here, that present global gravity field models meet the accuracy and resolution requirements for the reduction concept, and hence for the relative validation of GOCE gradients.

For an external calibration or validation based on regional data sets, terrestrial gravity anomalies are upward continued to gravitational gradients at GOCE altitude. The computations are done with synthetic data in a closed-loop simulation. Two upward continuation methods are considered, namely least-squares collocation and integral formulas based on the spectral combination technique. Both methods are described and the results are compared numerically with the ground-truth data. Finally, the results of a regional calibration experiment with simulated noisy GOCE gradients are described.

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Authors and Affiliations

  1. Institut für Erdmessung, University of Hannover, Schneiderberg 50, 30167, Hannover, Germany

    Focke Jarecki, Karen Insa Wolf, Heiner Denker & Jürgen Müller

Authors
  1. Focke Jarecki
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  2. Karen Insa Wolf
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  3. Heiner Denker
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  4. Jürgen Müller
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Editor information

Editors and Affiliations

  1. Institut für Astonomische Physikalische Geodäsie, TU München, Arcisstr. 21, 80290, München, Germany

    J. Flury  & R. Rummel  & 

  2. Dept. 1, Geodäsie und Fernerkundung Telegrafenberg, GeoForschungsZentrum Potsdam, 14473, Potsdam, Germany

    C. Reigber  & M. Rothacher  & 

  3. Bayerische Kommission für die Internationale Erdmessung, Bayerische Akademie der Wissenschaften, Marstallplatz 8, 80539, München, Germany

    G. Boedecker

  4. Forschungseinrichtung Satellitengeodäsie Fundamentalstation Wettzell, TU München, 93444, Kötzting, Germany

    U. Schreiber

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Jarecki, F., Wolf, K.I., Denker, H., Müller, J. (2006). Quality Assessment of GOCE Gradients. In: Flury, J., Rummel, R., Reigber, C., Rothacher, M., Boedecker, G., Schreiber, U. (eds) Observation of the Earth System from Space. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-29522-4_19

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