High frequency variations of the earth's instantaneous angular velocity vector : determination from VLBI data analysis

International audienceA new determination of the Earth's orientation is proposed by estimating only 3 infinitesimal angles. This method is applied to the determination of the diurnal and subdiurnal variations in the Earth's orientation from the VLBI campaign from 11 to 24 January 1994. It has been implemented in the Steel Breeze software for VLBI data processing at the Main astronomical Observatory of the Ukraine. The high-frequency variations of the instantaneous rotation vector are then calculated and compared with the horring and Dong model for these variations after being referred to the instantaneous rotation axis