VGOS CONT17: Comparison of VGOS results with S/X and GPS

CONT17 (00:00 UT 28-NOV-2017 through 24:00 UT 12-DEC-2017) is the latest in a series of successful CONTinuous VLBI observing sessions. During CONT17 two independent S/X networks observed for the entire period. In addition, a 6-station VGOS network observed for 5 days (December 4-8). In this presentation we focus on the results of the VGOS network. For EOP we compare the estimates with those of the independent VLBI S/X networks and comment on what this implies for EOP precision, while for polar motion the comparison is with GPS results. Baseline length repeatability is a basic measure of VLBI precision. To evaluate this, we look at the repeatabilities of the baseline lengths for both the VGOS and the S/X networks and how they compare. Atmosphere zenith delays and gradients at a site are common to both the VLBI and GPS antennas that are collocated. Many of the VGOS stations had nearby S/X stations, and all of them had associated GPS stations. This allows us to compare the VGOS estimates of atmosphere zenith delays and gradients with those of the S/X stations and GPS stations.