The new generation of space datum in China should comply with the latest IERS (International Earth Rotation and
Reference System Service) convention as much as possible. This paper has deeply addressed and researched the main
improvements of the current version IERS Conventions (2003), including the changes of the Terrestrial Reference
System, the Celestial Reference System, and the transformation between them, the tide correction and so on, which
would undoubtedly benefit the realization and maintenance of our space datum. Based on PANDA (Position And
Navigation Data Analyst) software developed by GNSS Center of Wuhan University, we analyzed the effect of
improvements of the IERS Conventions (2003) on precise orbit determination and precise positioning. The results show
that the effect of improvements of models of the coordinate transformation between the celestial and the terrestrial
reference system and tide correction (including solid earth tide, ocean tide and polar tide) on precise orbit determination
are 4mm, 9mm and 5mm in terms of RMS in along, cross and radial direction of the track; and the effect of the
improvement of the tide models on positioning is basically under 0.6mm, and the RMS of the differences are 0.3mm,
0.3mm and 0.2mm in X, Y and Z.
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