Solutions for the most recent realization of the International Terrestrial Reference System (ITRS) were computed by the three ITRS Combination Centers (CCs) of the International Earth Rotation and Reference Systems Service (IERS), namely the IGN in Paris (France), the JPL in Pasadena (USA) and the DGFI-TUM in Munich (Germany). Thereby, the solutions of IGN, and DGFI-TUM comprise conventional parameters of the ITRS (station coordinates and velocities) at a reference epoch as defined in the IERS Conventions 2010. Although the two solutions are based on identical input data, there exist systematic differences between them. Within all ITRS realizations, the scale is realized as a weighted mean scale between SLR (satellite laser ranging) and VLBI (very long baseline interferometry). If the combined scale is compared to the scale realized by both techniques itself, the IGN solution reveals significant differences between SLR and VLBI whereas the DGFI-TUM solution shows much smaller differences. In order to investigate the question whether there is a systematic scale difference between the two techniques or not, the combined solutions of IGN and DGFI-TUM as well as the single-technique solutions of both institutions are investigated and compared. In addition, the impact of the available SLR and VLBI co-locations and the used local ties on the scale realization is investigated.     «

Solutions for the most recent realization of the International Terrestrial Reference System (ITRS) were computed by the three ITRS Combination Centers (CCs) of the International Earth Rotation and Reference Systems Service (IERS), namely the IGN in Paris (France), the JPL in Pasadena (USA) and the DGFI-TUM in Munich (Germany). Thereby, the solutions of IGN, and DGFI-TUM comprise conventional parameters of the ITRS (station coordinates and velocities) at a reference epoch as defined in the IERS C...     »