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| Titel |
GOCE gradients in various reference frames and their accuracies |
| VerfasserIn |
J. Müller, M. Wermut |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: G1. The new gravity field mission (CHAMP, GRACE, GOCE): from measurements to geophysical interpretation ; Nr. 1 (2003-06-17), S.33-38 |
| Datensatznummer |
250000033
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| Publikation (Nr.) |
 copernicus.org/adgeo-1-33-2003.pdf |
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| Zusammenfassung |
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.
Key words. Satellite gradiometry, GOCE mission, reference
frames, transformation errors |
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