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This project is funded within the research group "Earth rotation and global dynamic processes" (FOR584) of the German Research Foundation (DFG). The aim of the project is to deliver long time series of consistently estimated parameters of the Earth's rotation and their derivatives (EOPs: coordinates of the terrestrial and celestial pole, UT1), the Earth's geometry (station positions and their non-linear time-dependent evolution) and the Earth's gravity field (low degree spherical harmonics). These parameters play a fundamental role in various projects of the research group.
Input data are long time series of the geodetic space observation techniques GPS, VLBI and SLR. Much attention is drawn on the usage of homogeneous models and constants. The observation techniques show different strengths in deriving the Earth's parameters and therefore the combination of the data allows a consistent estimation. Possible systematic effects of the individual techniques could be discovered and separated from the estimated parameters in the combination.
The main subtasks are: - Implementation of the EOPs time derivatives in the combination
- Improved estimation of the low-degree spherical harmonic coefficients
- Development of advanced combination methods
- Generation of observation time series by homogeneous processing
 - Upper part: estimated coordinates of the terrestrial pole in x-direction using observations to the geodetic space techniques GPS (green), VLBI (red) and SLR (blue). Additionally the weekly combination of all techniques is shown (black). Lower part: estimated coordinates of the terrestrial pole in x-direction of the 4-weekly (magenta) and the weekly (black) combination of all techniques.
Funding: DFG-Forschergruppe Erdrotation (DFG-FOR 584)
Period: 04/2009 - 03/2012
Project partners: TU München
Responsible persons at DGFI: Detlef Angermann, Mathis Bloßfeld
Selected publicationsBloßfeld M., Seitz M., Angermann D.: Effects of residual station motions signals on terrestrial pole coordinates. EGU, Vienna, Austria, 2012-04-23 (Poster)  |
Seitz M., Angermann D., Bloßfeld M., Drewes H., Gerstl M.: The 2008 DGFI Realization of the ITRS: DTRF2008. Journal of Geodesy, Volume 86, Issue 12, pp 1097-1123 , DOI: 10.1007/s00190-012-0567-2, 2012 |
Bloßfeld M., Müller H., Angermann D.: Adjustment of EOP and gravity field parameter from SLR observations. EGU Vienna, 2011-04-06 (Poster) |
Bloßfeld M., Müller H., Seitz M., Angermann D.: Benefits of SLR in epoch reference frames. Proceedings of the 17th ILRS Workshop, 2011 |
Bloßfeld M., Müller H., Angermann D.: Adjustment of EOP and gravity field parameters from SLR observations. Proceedings of the 17th ILRS Workshop, 2011 |
Angermann D., Bloßfeld M., Bosch W., Gerstl M., Heinkelmann R., Kelm R., Müller H., Sánchez L., Seemüller W., Seitz M.: DGFI-Beteiligung an den wissenschaftlichen Diensten der IAG. Zeitschrift für Vermessungswesen, 135, Heft 2, 2010 |
Schmidt M., Angermann D., Bloßfeld M., Göttl F., Richter B., Seitz M.: Erdrotation und geophysikalische Anregungsmechanismen. Zeitschrift für Vermessungswesen, 135, Heft 2, 2010 |
Seitz M., Angermann D., Bloßfeld M., Gerstl M., Heinkelmann R., Kelm R., Müller H.: Die Berechnung des Internationalen Terrestrischen Referenzrahmens ITRF2008 am DGFI. Zeitschrift für Vermessungswesen, 135, Heft 2, 2010 |
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