Realization of a traceable gravity reference at the Pecný station

Absolute gravity measurements with the FG5-215 and FG5X-251 gravimeters have been repeatedly conducted at the Pecný station since 2001. During the same period, the gravimeters regularly took part in 12 international comparisons of absolute gravimeters. Continuous monitoring of gravity variations at Pecný began in 2007 with the superconducting gravimeter OSG-050. Since several systematic effects of FG5/X gravimeters were resolved in the past, all absolute measurements have been reprocessed in 2024 using our standard procedure with AGDAS software. These gravity data have been combined with SG data to realize the gravity reference function, enabling the estimation of several characteristics of gravimeters. As the absolute measurements since 2020 have been performed under the scope of CIPM MRA with a declared uncertainty of 2.2 µGal, the gravity reference function at Pecný is directly traceable to the SI and can be used for the calibration of absolute gravimeters. Using relevant datasets and investigations, we present our approach to realize the reference station compatible with ITGRS, characterized by exceptional accuracy reaching the level slightly above 1 µGal.