Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....2772v&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #2772
Astronomy and Astrophysics
Astronomy
Scientific paper
In 2000, the International Astronomical Union adopted the new model of precession-nutation, based on Souchay et al. (1999) solution for the rigid Earth and the transfer function derived by Mathews et al. (2002) for a sophisticated geophysical Earth model. A few basic parameters of the model were estimated by a fit to VLBI observations of precession-nutation in 1979-1999, the data being given at roughly weekly intervals. Recently, the IVS combined solution appeared with a better time resolution, and the European center of IGS in Berne provides, since 1994, a solution with daily nutation rates, derived from GPS observations. These data are known to suffer from long-periodic systematic errors, most probably due to GPS orbit mismodelling. A procedure is proposed to constrain the long-periodic part of GPS-based nutation rates to VLBI, and then to combine both series to obtain high-resolution solution of precession-nutation which is compared with the new IAU2000 model.
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