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Erschienen in:
2014 | OriginalPaper | Buchkapitel
16. Cross-Overs Assess Quality of GOCE Gradients
verfasst von : Phillip Brieden, Jürgen Müller
Erschienen in: Observation of the System Earth from Space - CHAMP, GRACE, GOCE and future missions
Verlag: Springer Berlin Heidelberg
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Abstract
We address the important issue of quality assessment of GOCE gravitational gradients. To assess the gradients quality before being used in geophysical research and geodetic applications, a validation method is investigated that compares gradients in satellite track cross-overs (XO). The comparison of two three-dimensional measurements like the GOCE gradient tensors has to be performed in a common coordinate system, which requires tensor rotation. The XO residuals are then analyzed. An anomaly in the \({{\varvec{V}}}_{yy}\) component is identified affecting gradients in vicinity of the geographical and magnetic poles that spread to other tensor components (mainly \({{\varvec{V}}}_{xx}\) and \({{\varvec{V}}}_{xz})\) in the context of tensor rotation. The analysis of all non-anomaly-affected XO residuals underlines the very good quality of the GOCE gravitational gradients: \(\Delta {{\varvec{V}}}_{xx}\) and \(\Delta {{\varvec{V}}}_{yy}\) have an RMS of only 3.2 mE, the RMS of \(\Delta {{\varvec{V}}}_{zz}\) is only slightly worse with 5.3 mE.