The global Very Long Baseline Interferometry observation for measuring the Earth rotation＇s parameters was launched around 1970 s. Since then the precision of the measurements is continuously improving by taking into...The global Very Long Baseline Interferometry observation for measuring the Earth rotation＇s parameters was launched around 1970 s. Since then the precision of the measurements is continuously improving by taking into account various instrumental and environmental effects. The MHB2000 nutation model was introduced in 2002, which is constructed based on a revised nutation series derived from 20 years VLBI observations（1980-1999）. In this work, we firstly estimated the amplitudes of all nutation terms from the IERS-EOP-C04 VLBI global solutions w.r.t. IAU1980, then we further inferred the BEPs（Basic Earth＇s Parameters） by fitting the major nutation terms. Meanwhile, the BEPs were obtained from the same nutation time series using a BI（Bayesian Inversion）. The corrections to the precession rate and the estimated BEPs are in an agreement, independent of which methods have been applied.展开更多
基金funding from the European Research Council Advanced Grant:RotaNut,Project ID:670874
文摘The global Very Long Baseline Interferometry observation for measuring the Earth rotation＇s parameters was launched around 1970 s. Since then the precision of the measurements is continuously improving by taking into account various instrumental and environmental effects. The MHB2000 nutation model was introduced in 2002, which is constructed based on a revised nutation series derived from 20 years VLBI observations（1980-1999）. In this work, we firstly estimated the amplitudes of all nutation terms from the IERS-EOP-C04 VLBI global solutions w.r.t. IAU1980, then we further inferred the BEPs（Basic Earth＇s Parameters） by fitting the major nutation terms. Meanwhile, the BEPs were obtained from the same nutation time series using a BI（Bayesian Inversion）. The corrections to the precession rate and the estimated BEPs are in an agreement, independent of which methods have been applied.
