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ITRS Combination CentreDGFI has taken the responsibility for an ITRS Combination Centre within the International Earth Rotation and Reference Systems Service (IERS) since 2001. The ITRS Combination Centre is responsible for the computation of terrestrial reference frame realizations (ITRF) through the combination of space geodetic data sets (GPS, SLR, VLBI, DORIS) provided by the corresponding techniques' services (IGS, ILRS, IVS, IDS). DGFI has computed the following realizations of the terrestrial reference system:
ITRF Realisation 2008: DTRF2008 The computation of the International Terrestrial Reference Frame 2008 (DTRF2008) was completed in May 2010. DGFI2008 is an independent solution, based on the same input data as ITRF2008, which is computed by the IERS Combination Centre at IGN, Paris, and provided by the IERS Product Centre at IGN in May 2010. The difference between both solutions is the combination strategy: while a combination of solutions is performed at IGN, DGFI computation is based on the combination of normal equations. The DTRF2008 is a global terrestrial reference frame containing the station coordinates of 559 GPS, 106 VLBI, 122 SLR and 132 DORIS stations. The reference epoch for station positions is 2005-01-01, 0:00 UTC. Earth orientation parameters (EOP), i.e., coordinates of the terrestrial and the celestial pole, UT1-UTC and length of day (LOD), are simultaneously solved with the station coordinates. The time series of EOP covers the period from 1983 until the end of 2008. The solution is available in different file formats at ftp.dgfi.badw.de/pub/DTRF2008. Acknowledgement: The establishment of the ITRS Combination Centre at DGFI has been supported by the German Bundesministerium für Bildung und Forschung within the programme GEOTECHNOLOGIEN, Grant (IERS)03F0336C.
Selected publications
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