Comparison of Nutation Series from GPS and VLBI Observations Using IAU80 and IAU2000 Nutation Models

Details Comparison of Nutation Series from GPS and VLBI Observations Using IAU80 and IAU2000 Nutation Models Comparison of Nutation Series from GPS and VLBI Observations Using IAU80 and IAU2000 Nutation Models

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..53s&link_type=abstract

Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200

Astronomy and Astrophysics

Astronomy

Scientific paper

In our poster we concentrate on the estimation of nutation offset series from VLBI (Very Long Baseline Interferometry) and nutation rate series from GPS (Global Position System) data for the year 2005. The nutation series are estimated w.r.t. both IAU80 and IAU2000 nutation models. Our work was performed in several steps. Using the OCCAM 6.1 software for VLBI data analysis nutation offsets were computed from routine VLBI sessions R1 and R4, and from a special campaign called CONT05 (Continuous VLBI 2005), performed by the IVS (International VLBI Service) in September 2005. Then, nutation rates were derived from GPS data using 79 globally distributed permanent tracking stations which are part of the IGb00 realization of ITRF2000. For GPS data processing the Bernese software, Version 5.0 was used. Using nutation rate series computed w.r.t. the IAU2000 precession-nutation model we estimated nutation corrections for periods shorter than 20 days and we compared them to those computed from the VLBI nutation offset series. For these periods the differences between estimated corrections using the IAU80 and IAU2000 models were computed and compared with the differences obtained for the same periods from VLBI. Further, we derived nutation rates from VLBI nutation series and compared them with those estimated directly from GPS data. Finally, to take advantage of the strength of both space techniques (long-term stability of VLBI and high time resolution of GPS), the nutation offset and nutation rate time series were combined using the `combined smoothing' method introduced by Vondrák&Čepek in 2005. The dense VLBI CONT05 parameter series over a two-weeks subperiod allows to investigate the impact of high resolution VLBI nutation offset estimates on the combination. In our poster we will present the combined time series and we will discuss the results in detail.

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