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| Titel |
Issues of GOCE SSTI processing |
| VerfasserIn |
Ulrich Meyer, Heike Bock, Adrian Jaeggi, Jose van den Ijssel, Pieter Visser, Oliver Montenbruck |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048618
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| Zusammenfassung |
| ESA's first Earth Explorer Core Mission GOCE is equipped with a
Satellite-to-Satellite Tracking Instrument (SSTI) consisting of
a 12-channel dual-frequency Lagrange GPS receiver connected to a
helix antenna. The GPS data are primarily used for precise orbit
determination of the satellite and the derivation of the long
wavelength part of the Earth's gravity field. The Precise Science
Orbits derived from the almost continuous 1 Hz GPS data series
meet the mission accuracy requirement of 2 cm and reflect the good
quality of the GOCE GPS data.
The GOCE orbits are, however, of slightly reduced quality over the polar
regions. This is particularly important and evident for kinematic
positions, where an inferior quality directly maps into subsequent
gravity field solutions. The root-cause for the degradation is still
not yet fully understood, a correlation with more frequent L2 tracking
losses occurring near the geomagnetic poles is suspected, but difficult
to be demonstrated.
The worse observation geometry near the poles, the ionosphere which
is coupled with solar activity, and the magnetic field of the Earth
may contribute to the observed degradation. We investigate correlations
with possible contributors and present the state of our findings. |
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