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| Titel |
Gravity Field Determination at AIUB: From annual to multi-annual solutions |
| VerfasserIn |
Adrian Jaeggi, Lars Prange, Ulrich Meyer, Leos Mervart, Gerhard Beutler, Thomas Gruber, Rolf Dach, Roland Pail |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250036705
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| Zusammenfassung |
| Gravity field recovery at the Astronomical Institute of the University of Berne (AIUB) is
rigorously treated as an extended orbit determination problem. This so-called Celestial
Mechanics Approach is applied to GPS high-low satellite-to-satellite tracking (hl-SST) data
of low Earth orbiters (LEOs), via the use of kinematic LEO positions and the associated
covariance information, and to K-band low-low satellite-to-satellite tracking (ll-SST) data
of the GRACE mission. Kinematic LEO positions are determined at AIUB using
the GPS orbit and clock products of the Center for Orbit Determination in Europe
(CODE).
After almost ten years in orbit, CHAMP provides the unique opportunity to fully
exploit a long series of GPS hl-SST data and, in view of the GOCE mission, to gain
experience for gravity field recovery from LEOs at very low orbital altitudes. We will
present the new AIUB-CHAMP03S static gravity field model based on 8 years of
data and discuss the most important advances in the processing of GPS hl-SST
data. The benefits of our rigorous approach will also be demonstrated by our new
AIUB-GRACE03S static gravity field model based on 5 years of hl-SST and ll-SST
data.
The Celestial Mechanics Approach was generalized to model the annual, semi-annual and
trend signals of the time variable gravity field. First results of this procedure will be
presented, which is uniquely based on the daily normal equations also used as input for the
determination of the static GRACE gravity field models. |
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