[G07-5] GGOS observations: VLBI

[G07-5-05] Error budget analysis in Geodetic VLBI

^○Minghui Xu¹, James A. Anderson², Harald Schuh², Guangli Wang¹ (1.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 200030 Shanghai, China, 2.Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg 14473 Potsdam, Germany)

Source structure effects have remained an error source in geodetic VLBI for many decades, both because their impacts on geodetic VLBI have been underestimated, and because it was difficult to image such amounts of radio sources regularly. In this report, the magnitudes of structure effects and their influence on measurement noise will be discussed using closure delays, closure phases, source images derived from the geodetic visibility data, and the delay residuals of individual observables after VLBI data analysis. The error budget of structure effects, measurement noise, and all other error sources due to incomplete modeling in geodetic VLBI will be studied. This will greatly help us to have a good insight for the forthcoming VGOS.