IGS Earth Rotation Parameters |
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Authors: | Yves Mireault Jan Kouba Jim Ray |
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Institution: | (1) Geodetic Survey Division, NRCan, Ottawa, Canada K1A 0E9, CA;(2) U. S. Naval Observatory, Washington, DC, US |
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Abstract: | Since its official start in January 1994, the International GPS Service (IGS) has been distributing, as part of its product
combination, two distinct Earth rotation parameter (ERP) series: the IGS Rapid series and the IGS Final series. Initially,
the IGS Rapid ERP values were interpolations of the International Earth Rotation Service (IERS) Bulletin A, whereas the IGS
Final ERP series was based on the IERS Bulletin B. Since June 1996, the IGS has been generating its own Final ERP series consistent
with the IGS combined orbit products and based on weighted means of individual IGS analysis center (AC) solutions. At first,
only the polar motion (PM) coordinates and their rates were combined. Length of Day (LOD) and Universal Time (UT) solutions,
also based on separate weighted mean combinations, followed in March 1997. Currently, the IGS Rapid and Final combinations
are produced and made available within 17 hours and 11 days, respectively, after the last observation. Both IGS and the best
AC series are consistent and precise at the 0.1-milliarcsecond (mas) level for PM and at about 30 μs for LOD. Biases in some
AC solutions may exceed these consistency levels. Comparisons of both IGS ERP series with external standards, such as the
IERS multitechnique Bulletins and atmospheric angular momentum series, confirm the estimated precisions. ? 1999 John Wiley
& Sons, Inc. |
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