Validation of GOCE gravitational gradients in satellite track cross-overs

verfasst von
Phillip Brieden, Jürgen Müller

The important issue of quality assessment of GOCE gravitational gradients is addressed. The validation approach that is investigated compares measured gravitational gradients in satellite track cross-overs (XOs). Important updates and changes of our previous XO processing are presented: XO comparison has to be performed in one and the same coordinate system, which necessitates the transformation of the gravitational gradient tensor. As two of the six independent tensor components are less accurate and the remaining four components contain long-periodic inaccuracies, filtering of the gradient time series and the use of model information is required to enable tensor rotation without loss of accuracy. The second part of the paper focuses on the analysis of residual gradient differences in cross-overs. RMS values and the geographical distribution of the XO residuals are used to assess the GOCE gravitational gradients’ quality. The RMS values of the XO residuals are about 3.2 mE for Vxx and Vyy, and 5.3 mE for Vzz. Areas are identified showing an accumulation of slightly larger XO residuals for individual tensor components. These larger residuals are probably caused by solar winds and an interaction of the accelerometers with the Earth’smagnetic field. In summary, the high quality of the GOCE gravitational gradients is confirmed.

Institut für Erdmessung
Aufsatz in Konferenzband
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ASJC Scopus Sachgebiete
Computer in den Geowissenschaften, Geophysik
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