Characterizing Short-term Variability in VGOS Group Delay Observables

The VLBI Global Observing System (VGOS) uses ultra-wideband linear receivers (from 2 GHz to 14 GHz) for high-precision station geodetic positioning. To achieve accurate geodetic and astrometric measurements, VGOS observes each radio source in scans as short as 7 seconds. However, group delay observables are affected by instrumental effects and potential systematic errors introduced, for instance, by atmospheric turbulence. In this poster, we perform a time-series analysis of the VGOS group delay to characterize its short-term variability to investigate its stability.