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Preprocessing and analysis of the GOCE gravity gradients

On the one hand, a comprehensive analysis of the GOCE gravity gradient measurements should be performed in the context of the REAL-GOCE project (see figure below). The project consists of

  1. a full analysis of the internal calibration process eliminating all semi-empirical parts,
  2. a spectral analysis (in the time domain along the orbit and on the sphere) of the gradiometric components individually and of their combination,
  3. optimal rotation of the gradient components from the gradiometer frame to arbitrary user frames with minimum loss of accuracy and
  4. cross-validation and combination with altimetric data tracks.

The result will be an assessment of quality and characteristics of GOCE gravitational gradients as basis for any further use in geodesy, geophysics and oceanography. The project is executed in close collaboration with  IAPG (TU Munich).

 

Overview of the REAL-GOCE activities, the input and output data.

On the other hand, the GOCE gravity gradients are to be preprocessed, that is, corrections for temporal gravity field variations have to be computed and applied, outliers and data gaps have to be detected and flagged and the gradiometer has to be calibrated with external data. The preprocessed gradients can be used for gravity field analysis and can be used in geophysical applications. This project is preformed in close collaboration with IAPG (TU Munich) in the context of the GOCE HPF (high-level processing facility).

 

GOCE satellite with gradiometer.

Selected publications

Bouman J., Bosch W., Sebera J.: Assessment of systematic errors in the computation of gravity gradients from satellite altimeter data. Marine Geodesy, 34:85-107, DOI: 10.1080/01490419.2010.518498, 2011
Bouman J., Fiorot S., Fuchs M., Gruber T., Schrama E., Tscherning C.C., Veicherts M., Visser P.: GOCE gravitational gradients along the orbit. Journal of Geodesy, DOI: 10.1007/s00190-011-0464-0, 2011
Bouman J., Rispens S., Gruber T., Koop R., Schrama E., Visser P., Tscherning C.C., Veicherts M.: Preprocessing of gravity gradients at the GOCE high-level processing facility. Journal of Geodesy, 83:659-678, DOI 10.1007/s00190-008-0279-9, 2009
Bouman J., Stummer C., Murböck M., Fuchs M., Rummel R., Pail R., Gruber T., Bosch W., Schmidt M.: GOCE gravity gradients: a new satellite observable. GEOTECHNOLOGIEN Statusreport, 2010
Fuchs M., Bouman J.: Rotation of GOCE gravity gradients to local frames. Geophysical Journal International, DOI:10.1111/j.1365-246X.2011.05162.x, 2011
Rispens S., Bouman J.: Calibrating the GOCE accelerations with star sensor data and a global gravity field model. Journal of Geodesy, 83:737-749, DOI 10.1007/s00190-008-0290-1, 2009

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