Simultaneous Estimation of a TRF, the EOP and a CRF

摘要

The paper presents first results of a DGFI VLBI solution with simultaneous estimation of station positions and velocities, celestial coordinates of the radio sources and Earth orientation parameters. The datum is realised by NNT and NNR conditions for the terrestrial (ITRF2000) and NNR for the celestial reference (ICRF-Ext1) frame. Using minimum datum conditions, biases can be avoided which are due to fixed reference frames or other relevant parameters of the observation equations.