摘要：VLBI is the only space-geodetic technique which gives direct access to the Earth’s phase of rotation, i.e.
universal time UT1. Beside multi-baseline sessions, regular single baseline VLBI experiments are scheduled
in order to provide estimates of UT1 for the international space community. Although the turn-around time of
such sessions is usually much shorter and results are available within one day after the data were recorded, lower
latency of UT1 results is still requested. Based on the experience gained over the last two years, an automated
analysis procedure was established. The main goal was to realize fully unattended operation and robust estimation
of UT1. Our new analysis software, named c5++, is capable of interfacing directly with the correlator output,
carries out all processing stages without human interaction and provides the results for the scientific community
or dedicated space applications. Moreover, the concept of ultra-rapid VLBI sessions can be extended to include
further well-distributed stations, in order to obtain the polar motion parameters with the same latency and provide
an up-to-date complete set of Earth orientation parameters for navigation of space and satellite missions.
