Analysis of local ties from multi‑year solutions of different techniques

Local ties are a key element for the combination of different space techniques. This paper focuses on the analysis of local ties by using multi-years VLBI, SLR, GPS and DORIS solutions. Input are combined intra-technique solutions for each of these space techniques. Major issues are to compare the space geodetic estimated station coordinate differences between co-located instruments with the local ties, and to analyse velocity estimations of different techniques at co-location sites. Based on the obtained results suitable local ties are selected and various aspects regarding the intertechnique combination are discussed.