Statistics – Computation
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001evga.conf...83t&link_type=abstract
Proceedings of the 15th Workshop Meeting on European VLBI for Geodesy and Astrometry. Institut d'Estudis Espacials de Catalunya,
Statistics
Computation
Scientific paper
VLBI is the only geodetic space technique which directly links the terrestrial and the celestial reference frame. Since nearly all observing networks are of global nature, VLBI is particularly suitable to deduce the Earth orientation parameters (EOP). In this paper, investigations are presented which were carried out to assess highly resolved EOP determined by means of VLBI. A theoretical consideration shows that an attempt to estimate simultaneously daily nutation parameters and subdaily pole coordinates would lead to high correlations between these parameters so that they are practically not separable. Furthermore, the relation between the observing geometry and highly resolved EOP was investigated using typical NEOS-A, CORE-A and IRIS-S sessions. Systematic correlation schemes were detected between highly resolved EOP and also very weakly determined EOP in single time intervals were found. Amplitudes of the eight diurnal and semidiurnal main tides in ΔUT1 were deduced from one-hourly estimates of 52 simultaneous NEOS-A and CORE-A sessions. The results were compared with results of other geodetic space techniques as well as the model for daily and subdaily ocean tidal variations in the Earth's rotation by Ray (IERS Conventions, 1996). The computations were done with the OCCAM 5.0 software using a least-squares approach in the Gauss-Markov model.
Kutterer Hansjörg
Richter Burghard
Schuh Harald
Tesmer Volker
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