Combined celestial pole offsets from VLBI and GPS
Abstract
The recently proposed method of "combined smoothing" is used to combine celestial pole offsets determined at the Institute of Applied Astronomy in St. Petersburg (from VLBI observations) with the celestial pole offset rates determined at the Universiy of Berne (from GPS observations), in the interval 1997.0-2000.0. We demonstrated in our previous analyses that the latter series suffers from long-periodic systematic errors, with periods longer than a month, the most expressed period being about 60 days. Therefore, we removed the long-periodic part of celestial pole offset rates before the combination was made. The combined series is then compared on one hand to various solutions derived from the VLBI analysis centers and to recent theoretical precession-nutation models on the other hand. It is demonstrated that unbiased rms of the differences are typically in the range of 0.40 mas for both celestial pole offset components, the best agreement being found between combined smoothing and recently adopted precession-nutation theory IAU2000.
- Publication:
-
Journées 2001 - systèmes de référence spatio-temporels. Influence of geophysics, time and space reference frames on Earth rotation studies
- Pub Date:
- 2003
- Bibcode:
- 2003jsrs...13...11V
- Keywords:
-
- Earth Orientation Parameters;
- VLB Interferometry;
- Polar Motion