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| Titel |
Gravity Field Determination at AIUB: Current Activities |
| VerfasserIn |
A. Jaeggi, G. Beutler, L. Prange, U. Meyer, L. Mervart, R. Dach, R. Rummel, T. Gruber |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026810
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| Zusammenfassung |
| Research on global gravity field recovery from satellite missions such
as CHAMP and GRACE was initiated at the Astronomical Institute of the
University of Bern (AIUB, Switzerland) in the year 2006. Since September
2007, the activities were extended in the framework of the project
Satellite Geodesy sponsored by the Institute for Advanced Study (IAS)
of the Technical University of Munich (TUM, Germany).
Gravity field recovery at 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 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). CODE is an
analysis center of the International GNSS Service (IGS) and is operated by
AIUB in cooperation with the Federal Office of Topography (swisstopo,
Switzerland), the Federal Office of Cartography and Geodesy (BKG, Germany),
and the Institute of Astronomical and Physical Geodesy (IAPG) of the
Technical University of Munich.
We will describe the currently implemented refined processing strategies of
the Celestial Mechanics Approach and present selected results. The benefits
of our rigorous approach are demonstrated by comparisons of our latest
annual GRACE ll-SST solutions and multi-annual CHAMP hl-SST solutions with
the results of other groups and by external validations. A special focus is on
the relevance of background models for GRACE gravity field determination when
using K-band data, and on the impact of systematic errors in GPS observations
when performing gravity field recovery with hl-SST observations. |
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