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Поисковые слова: п п п п п п п п п п п п п п п п п п п п п п п
IAA EOP Service
IAA EOP Service
Russian page


General Information To the top of the page

Earth Orientation Parameters (EOP) Service is operated by the Laboratory of Space Geodesy and Earth Rotation (LSGER) of the Institute of Applied Astronomy of the Russian Academy of Sciences (IAA). The main milestones of the IAA EOP Service history are:

March 1995   First IAA SLR EOP submission to IERS Annual Report
April 1995   Beginning of operational processing of SLR observations
May 1995   First appearance of IAA SLR EOP in the IERS Bulletin B
July 1995   First appearance of IAA SLR EOP in the IERS Bulletin A
February 1996   Beginning of operational processing of VLBI observations
March 1996   First IAA VLBI EOP submission to IERS Annual Report
    First appearance of IAA VLBI EOP in the IERS Bulletin B
August 1999   First appearance of IAA VLBI EOP in the IERS Bulletin A
October 2001   Beginning of operational processing of GPS observations
January 2002   First appearance of IAA GPS EOP in the IERS Bulletin B
March 2002   First IAA GPS EOP submission to IERS Annual Report
April 2004   Beginning of regular prediction of observed corrections to the IAU2000A model
August 2005   First issue of the weekly Bulletin

Now both operative and final EOP series have being computed. The IAA EOP series are routinely submitted to the IERS and IVS and are included in their operative and final combinations. Everyday operative processing of SLR, GPS and VLBI Intensive observations is fully automated.

CDDIS (NASA Goddard Space Flight Center, Greenbelt, MD, USA) is used as primary data center for VLBI, SLR and GPS observations, and EDC (Deutsches Geodätisches Forschungsinstitut, Munich, Germany) is used as supplement center for operational SLR data.

We use several program packages for analysis mostly developed at the IAA: GROSS for processing of the SLR observations and analysis of EOP and coordinates time series, OCCAM/GROSS for computation of EOP, station coordinates, and troposphere parameters time series from the VLBI observations, GRAPE for processing of GPS observations.

Special software has been developed for automatic data and results exchange inside IAA and between IAA and outer services and data centers and support of data bases related to the IAA EOP Service activity.

Software used for analysis includes both MS DOS/Windows (data analysis, internal data exchange, data storage) and Unix (data exchange with outer centers, web and ftp servers) components.

Products To the top of the page

Estimates of the full set of EOP (Earth pole coordinates Xp and Yp with rates Xp_rate and Yp_rate, Universal Time UT1-UTC or TAI-UT1, length of day LOD, celestial pole coordinates dPsi, dEps or dXc, dYc) are computed using observations collected from global VLBI, SLR and GPS networks. SLR series is updated daily, other series are updated 3-4 times per week. Accuracy of EOP is about 0.10-0.25 mas depending on technique.

Related links To the top of the page

Contact:   Dr. Iskander Gayazov, gayazov@ipa.nw.ru To the top of the page


Last updated on 19 Jun 2006
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