Abstract
ITRF2005 is the first terrestrial reference frame computed from weekly/ session-wise data sets of the geodetic space techniques GPS, VLBI, SLR and DORIS. This allows to detect time variable effects in station positions, such as discontinuities or seasonal variations. In the combination of the terrestrial reference frame these time variable effects need to be taken into account.
As part of the reference frame computation with the ITRF2005 data sets at DGFI, we have computed multi-year solutions of each technique with the combination software DOGS-CS. We compared individual weekly data sets to the multi-year solution by aligning them with a 7 parameter similarity transformation and analyzed the resulting time series of station positions and transformation parameters. This is done with respect to discontinuities (caused e.g. by instrumental changes or earthquakes) or periodic signals such as annual variations. This information is then used to compute a second improved iteration of technique multi-year solutions, where these effects are taken into account.
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Meisel, B., Angermann, D., Krügel, M. (2009). Influence of Time Variable Effects in Station Positions on the Terrestrial Reference Frame. In: Drewes, H. (eds) Geodetic Reference Frames. International Association of Geodesy Symposia, vol 134. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00860-3_14
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DOI: https://doi.org/10.1007/978-3-642-00860-3_14
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