Publications

Time series of geodetic Earth system parameters have been derived by means of dynamic satellite orbit adjustment. The procedures applied are the integrated approach where GPS sender satellites, GPS and SLR ground stations, and the Low Earth Orbiter (LEO) CHAMP are processed simultaneously within one model. On the other hand we present a pure SLR solution from LAGEOS-1 and -2 data based on the same standards. The particular advantage of the integrated approach is the high sensitivity of the LEO to the geocenter, and the dense coverage of GPS data sets the basis to a high resolution of the solved-for parameters. The classical SLR-only approach provides a reference for comparison to the integrated approach and to published external results. The set of estimated Earth system parameters includes coordinates of ground stations, low degree harmonic coefficients of the Earth’s gravity field, and Earth Orientation Parameters. The parameter time series are characterized concerning accuracy and reliability. Comparisons between both methods are presented as well as comparisons with external series.

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König, R.; König, D.; Neumayer, K. H. (2009): Station coordinates and low degree harmonics with daily resolution from a GPS/CHAMP integrated solution and with weekly resolution from a LAGEOS-only solution. - In: Drewes, H. (Eds.), Geodetic reference frames, Springer, 31-38.