On the Improvement of Combined EOP Series by Adding 24-h VLBI Sessions to VLBI Intensives and GNSS Data

Abstract The publicly available Earth Orientation Parameter (EOP) time series provided by the Centre of IERS (e.g., Bulletin A, 14 C04) result from combination individual space-geodetic solutions on a daily basis, i.e., parameter-level combination. Current activities Federal Agency for Cartography and Geodesy (BKG) focus development strategy, main objective which is to improve consistency between techniques through common parameters, mainly EOP, but also station coordinates tropospheric parameters using local ties atmospheric ties, respectively. In this study, we present our strategy results VLBI data within approximately two weeks (i.e., Intensive R1/R4 sessions) with global GNSS network. done at normal equation (NEQ) level multi-day basis. We compare EOP respective single-technique as well low-latency inter-technique (COMBI RAP) examined in previous studies, based only. found regarding dUT1 solution, that addition sessions Intensives has positive impact entire 7-day especially stabilizes estimates boundary days continuous polygon. left right day compared A COMBI RAP reveal an improvement terms WRMS residuals 2.3 μs 1.4 μs, For pole coordinates, external reference almost same solution.