Scheduling Scenarios for VLBI Observations of Satellites

Impact of Tropospheric Ties on UT1‐UTC in GNSS and VLBI Integrated Solution of Intensive Sessions

“…Coordinates of ground stations and AGN are fixed to the a priori values, and only UT1-UTC is estimated while polar motion and celestial pole offsets are fixed. Persistent efforts were made to investigate and improve UT1-UTC estimates based on INT sessions, including optimized scheduling strategies (Artz et al, 2012;Baver & Gipson, 2020;Gipson & Baver, 2015;Kareinen et al, 2017;Schartner et al, 2021Schartner et al, , 2022, the impact of a priori EOP (mainly polar motion and celestial pole offsets) (Malkin, 2011;Nothnagel & Schnell, 2008) and seasonal station motions (Malkin, 2013), automated processing (Hobiger et al, 2011;Kareinen et al, 2015), and the combination with GNSS (Hellmers et al, 2019;Thaller et al, 2008).…”