GOCE gradients in various reference frames and their accuracies

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Müller, J.: GOCE gradients in various reference frames and their accuracies. In: Advances in Geosciences 1 (2003), S. 33-38. DOI: https://doi.org/10.5194/adgeo-1-33-2003

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Sum total of downloads: 106

The objective of GOCE (Gravity Field and Steady-State Ocean Circulation Explorer) is the determination of the Earth's gravity field with high spatial resolution. The main science sensor (the gradiometer) measures differential accelerations, from which the gravitational gradients, i.e. the matrix of the second derivatives of the gravitational potential, are derived. Some of them (the diagonal components of the gravitational tensor) are observed with highest accuracy, 4 mE/?Hz in a frequency range from 5 mHz to 100 mHz, whereas the off-diagonals are obtained less accurately. The gradients will be observed in the instrument frame, which approximates the along-track oriented, local orbital frame. For the transformation of the gradients in other frames (e.g. in the strictly earth-pointing frame or a local geodetic frame), the transformation parameters (orientation angles) and all components of the gravity tensor have to be known with sufficient accuracy. We show how the elements of the gravitational tensor and their accuracies look like in the various frames as well as their spectral behaviour, if only the GOCE observations are used for the transformation. Only V zz' keeps approximately its original accuracy in all frames discussed, except in the earth-fixed frame ITRF (International Terrestrial Reference Frame). Therefore we recommend to analyse the gradients as 'close' as possible in the observation frame.
License of this version: CC BY-NC-SA 2.5 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2003
Appears in Collections:Fakultät für Bauingenieurwesen und Geodäsie

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pos. country downloads
total perc.
1 image of flag of Germany Germany 75 70.75%
2 image of flag of United States United States 8 7.55%
3 image of flag of China China 4 3.77%
4 image of flag of Poland Poland 3 2.83%
5 image of flag of Indonesia Indonesia 3 2.83%
6 image of flag of No geo information available No geo information available 2 1.89%
7 image of flag of Czech Republic Czech Republic 2 1.89%
8 image of flag of Vietnam Vietnam 1 0.94%
9 image of flag of Netherlands Netherlands 1 0.94%
10 image of flag of Canada Canada 1 0.94%
    other countries 6 5.66%

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