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| Titel |
Reference frame-induced errors in VLBI Earth rotation determinations |
| VerfasserIn |
Robert Heinkelmann, Maria Karbon, Li Liu, Cuixian Lu, Julian A. Mora-Diaz, Tobias J. Nilsson, Virginia Raposo-Pulido, Benedikt Soja, Minghui Xu, Harald Schuh |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250090847
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| Publikation (Nr.) |
 EGU/EGU2014-5107.pdf |
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| Zusammenfassung |
| Earth Rotation is defined as the transformation between the Geocentric Celestial Reference
System (GCRS) and the International Terrestrial Reference System (ITRS). It is a
three-dimensional rotation which is described by the precession/nutation Q, the Earth rotation
R, and the polar motion W matrices (IERS Coventions 2010):
xGCRS = QRWxITRS.
The actual determination of Earth Rotation by Very Long Baseline Interferometry
(VLBI) is based on the reference frames involved in the VLBI analysis. VLBI is the
only space-geodetic technique used for the realization of the International Celestial
Reference System (ICRS), which is the geocentric celestial reference system (GCRS)
practically realized to evaluate the above equation. Since the Earth Orientation
Parameters (EOP) are obtained as ‘session-wise parameters’, they can suffer from any
inconsistencies between session-wise TRF and CRF realizations. In this paper we
assess the session-wise TRF and CRF differences by determining the respective
transformation parameters of the adjusted terrestrial and celestial positions on a session
basis to the catalogue coordinates, given by the International Terrestrial Reference
Frame 2008 (ITRF2008) and the Second International Celestial Reference Frame
(ICRF2). |
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