Journal: IVS 2014 General Meeting Proceedings "VGOS: The New VLBI Network" Dirk Behrend, Karen D. Baver, and Kyla L. Armstrong (Eds), 277–278
Keywords: VLBI, troposphere, WVR
The zenith wet tropospheric delay is one of the parameters that need to be estimated in routine VLBI data processing. Stations of the Russian national VLBI network “Quasar-KVO” will be equipped with water vapor radiometers in the next year, and we performed several experiments in order to estimate how the external tropospheric data can improve the accuracy of VLBI astrometry results. We process hourly UTC–UT1 estimation sessions using VLBI and GPS estimated tropospheric delays. In the first case, one can see potential improvement from external tropospheric data in the UTC–UT1 formal errors. The second case shows that, when we use truly external data from GPS, the results can be improved.