Other
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ivsg.conf..288a&link_type=abstract
International VLBI Service for Geodesy and Astrometry 2000 General Meeting Proceedings, edited by Nancy R. Vandenberg and Karen
Other
Scientific paper
A significant number of VLBI and SLR stations are equipped with GPS receivers. A few true fundamental stations with all three techniques even exist. Each technique has its strength and weakness with respect to the determination of geodetic parameters and together they complement each other in a way that should be fully taken advantage of in the data analysis. The simultaneous analysis of different data types at the observation level, due consideration of the physical interrelations, and presentation of results in a common reference system, are the main ideas behind the development of the GEOSAT software. A new and improved version of the software has been implemented with automatic generation of 1) observation residuals and observation partial derivatives for VLBI, GPS and SLR, consistent at the 0.1 ppb level, and 2) a simultaneous arc-by-arc UD-filtering at the observation level. A very advanced multi-level (presently four parameter levels including stochastic parameter representations at each level) SRIF arc combination software for long-term solutions has been developed and validated. The main elements of the processing scheme will be presented. The first results with a simultaneous analysis of different space geodetic data types (VLBI, GPS, and SLR) at the observation level were presented at the IERS-98 symposium in Potsdam and at GP599 in Tsukuba. The analysis has recently been extended with significantly more observations. Results (Earth orientation parameters, geocenter, radio source coordinates, station coordinates, ...) from the new analysis will be presented. It is demonstrated that UT1 and nutation parameters can be determined also for days where VLBI data is unavailable.
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