Dear Markus and other colleagues,

I know my topic is not exactly in the focus of CPP activities, but I 
would like to inform you that we (i.e., Robert Weber, Cyril Ron and 
myself) proposed for AGU Fall Meeting the following presentation:

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Celestial motion of Earth's spin axis derived from the combination of 
VLBI and GPS observations

J. Vondrák, C. Ron and R. Weber

The motion of Earth's spin axis in space is monitored by VLBI, and 
since 1994 also its rate is measured by GPS. The method of "combined 
smoothing", developed recently at the Astronomical Institute in Prague
enables to combine both series. The solution, based on observations in
1979.6-2004.5, is compared  with the recently adopted IAU2000 model of
precession-nutation. The analysis reveals statistically significant
deviations from the model. These differences can be identified with 
free core nutation (FCN) and several forced nutation terms.
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I will not be able to prepare something quite different from this study,
but I could enlarge it by adding a similar GPS/VLBI combined solution of
LOD/UT1. If you feel it would be worth presenting at the Workshop, 
please let me know, and I will do my best.

Best regards, Jan

__________________________________________________________
Jan Vondrak                          phone (420) 267103043
Deputy director for foreign contacts fax   (420) 272769023
Astronomical Institute               e-mail vondrak@ig.cas.cz
Bocni II,1401      
141 31 Prague 4
Czech Republic