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| Titel |
Consistency evaluation of space geodetic techniques via ITRF combination |
| VerfasserIn |
Zuheir Altamimi, Xavier Collilieux, Laurent Métivier |
| 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 |
250049696
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| Zusammenfassung |
| The International Terrestrial Reference Frame (ITRF) combination
is heavily dependent on the configuration, precision and
co-locations of integrated global geodetic solutions (VLBI, SLR,
GPS, DORIS). Each one of these techniques contributes to one or
more, but not to all ITRF defining parameters (origin, scale,
orientation). Consistency of these solutions, connected via local
ties at co-location sites, in station positions and linear
velocities is a prerequisite for an optimal ITRF combination. The
ITRF2008 had shed some light on significant inconsistencies
observed at co-location sites where at 50% of these sites we
observed discrepancies larger than 6 mm between local ties and
space geodesy estimates. We recall the combination strategy adopted
to mitigate the impact of these inconsistencies on the frame defining
parameters. We evaluate the currently achievable accuracy of the ITRF
physical parameters, namely the origin and scale, as a function
of local ties and the level of technique agreement on station
velocity estimates. |
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