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The combined adjustment of station coordinates together with Earth orientation parameters (EOPs) and low degree spherical harmonic coefficients of the Earth's gravity field is a big effort since there are high correlations between the parameters. Based on homogeneously processed data of the geodetic space techniques GPS, VLBI and SLR, the combination could be used to estimate all parameters in one common adjustment. Thereby, systematics in the techniques could also be identified.
A major focus is drawn on determining the relative weights of the techniques in the combination (e.g. variance component estimation). Also the influence of the temporal resolution of the estimated parameters is investigated. To improve the computation speed, parallel processing algorithms are used.
Additional subtasks are: - investigation of the effect of the station parameterization on consistently estimated parameters like the EOPs or the gravity field parameter
- consistent estimation of EOPs together with parameters of the satellite orbit
- investigation of the high-precise estimation of gravity field parameters
- consistent estimation of station coordinates, EOPs and gravity field parameter and their geophysical interpretation
 - Estimated normalized gravity field coefficients over a time span of 16.5 years from 1994.0 until 2010.5. The different DGFI solutions contain observationalo data to LAGEOS1 and LAGEOS2.
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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