HR: 0800h
AN: G31B-0796    [Abstracts]
TI: ITRS Combination Center at DGFI: TRF Realisations and Accuracy Evaluation
AU: * Drewes, H
EM: drewes@dgfi.badw.de
AF: Deutsches Geodaetisches Forschungsinstitut, Marstallplatz 8, M］chen, 80539 Germany
AU: Angermann, D
EM: angermann@dgfi.badw.de
AF: Deutsches Geodaetisches Forschungsinstitut, Marstallplatz 8, M］chen, 80539 Germany
AU: Kruegel, M
EM: kruegel@dgfi.badw.de
AF: Deutsches Geodaetisches Forschungsinstitut, Marstallplatz 8, M］chen, 80539 Germany
AU: Meisel, B
EM: meisel@dgfi.badw.de
AF: Deutsches Geodaetisches Forschungsinstitut, Marstallplatz 8, M］chen, 80539 Germany
AU: Gerstl, M
EM: gerstl@dgfi.badw.de
AF: Deutsches Geodaetisches Forschungsinstitut, Marstallplatz 8, M］chen, 80539 Germany
AU: Seemueller, W
EM: seemueller@dgfi.badw.de
AF: Deutsches Geodaetisches Forschungsinstitut, Marstallplatz 8, M］chen, 80539 Germany
AB: DGFI serves as an ITRS Combination Center within the International Earth Rotation and Reference Systems Service (IERS). The poster presents the combination methodology and the terrestrial reference frame realisations computed at DGFI. These are the TRF realisation based on multi-year VLBI, SLR, GPS and DORIS solutions, and a TRF computation based on epoch (e.g. weekly/daily) normal equations of the different space techniques. This new approach has major advantages, as for instance the detection of discontinuities and non-linear effects of site motions and TRF datum parameters (e.g., origin, scale). Combination methods and parameterisations for modelling all the observed non-linear effects and discontinuities have to be improved. The performed TRF computations provide valuable results to assess the current accuracy of the terrestrial reference frame. The combined intra-technique solutions were used to evaluate the TRF accuracy by comparing the space geodetic solutions with local ties, and the velocity estimations of co-located instruments. The current accuracy is not satisfying for many co-location sites. Remaining biases between the contributing space techniques are a major error source. Furthermore, the poster presents the comparison of the DGFI TRF realisation with ITRF2000, which provides an optimal basis for a validation and a first "quasi-independent" accuracy assessment.
DE: 1229 Reference systems
DE: 1247 Terrestrial reference systems
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting