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| Titel |
Comparison of numerical solution strategies for gravity field recovery from GOCE SGG observations implemented on a parallel platform |
| VerfasserIn |
R. Pail, G. Plank |
| 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.39-45 |
| Datensatznummer |
250000034
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| Publikation (Nr.) |
 copernicus.org/adgeo-1-39-2003.pdf |
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| Zusammenfassung |
The recovery of a full set of gravity field parameters
from satellite gravity gradiometry (SGG) is a huge numerical
and computational task. In practice, parallel computing
has to be applied to estimate the more than 90 000 harmonic
coefficients parameterizing the Earth’s gravity field up
to a maximum spherical harmonic degree of 300. Three independent
solution strategies, i.e. two iterative methods (preconditioned
conjugate gradient method, semi-analytic approach)
and a strict solver (Distributed Non-approximative
Adjustment), which are operational on a parallel platform
(‘Graz Beowulf Cluster’), are assessed and compared both
theoretically and on the basis of a realistic-as-possible numerical
simulation, regarding the accuracy of the results, as
well as the computational effort. Special concern is given
to the correct treatment of the coloured noise characteristics
of the gradiometer. The numerical simulations show that
there are no significant discrepancies among the solutions of
the three methods. The newly proposed Distributed Nonapproximative
Adjustment approach, which is the only one
of the three methods that solves the inverse problem in a strict
sense, also turns out to be a feasible method for practical applications.
Key words. Spherical harmonics – satellite gravity gradiometry
– GOCE – parallel computing – Beowulf cluster |
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