HR: 13:55h
AN: G42B-02 INVITED     [PDF]
TI: Combination of GPS and VLBI Troposphere Parameters of the CONT'02 Campaign and Comparison With WVR
AU: * Rothacher, M
EM: rothacher@bv.tum.de
AF: Forschungseinrichtung Satellitengeodaesie, TU Munich, Arcisstrasse 21, Munich, D-80290 Germany
AU: Thaller, D
EM: daniela.thaller@bv.tum.de
AF: Forschungseinrichtung Satellitengeodaesie, TU Munich, Arcisstrasse 21, Munich, D-80290 Germany
AU: Schmid, R
EM: schmid@bv.tum.de
AF: Forschungseinrichtung Satellitengeodaesie, TU Munich, Arcisstrasse 21, Munich, D-80290 Germany
AU: Kruegel, M
EM: kruegel@dgfi.badw.de
AF: Deutsches Geodaetisches Forschungsinstitut, Marstallplatz 8, Munich, D-80539 Germany
AU: Tesmer, V
EM: tesmer@dgfi.badw.de
AF: Deutsches Geodaetisches Forschungsinstitut, Marstallplatz 8, Munich, D-80539 Germany
AU: Angermann, D
EM: angerman@dgfi.badw.de
AF: Deutsches Geodaetisches Forschungsinstitut, Marstallplatz 8, Munich, D-80539 Germany
AB: In October 2002, organized by the International VLBI Service for Geodesy and Astrometry (IVS), a 15-day campaign of continuous VLBI observations, named CONT'02, took place. During this campaign also water vapor radiometers (WVRs) were co-located at several of the eight VLBI sites to measure the integrated water vapor in the atmosphere. Therefore, the CONT'02 campaign is well-suited to compare and to combine the information about the troposphere derived from VLBI, GPS, and WVRs. Using the two weeks of CONT'02 data from VLBI and the global GPS data of the same time span, daily unconstrained normal equations were generated, taking much care to use identical models (solid Earth tides, ocean loading, a priori tropospheric delays, a priori nutation model, \dots) and the same parameterization of the common parameters, i.e., site coordinates, Earth Orientation Parameters (EOPs) and tropospheric zenith delays and gradients, for both space geodetic techniques. In this contribution we focus on the combination aspects related to troposphere, namely, on the corrections necessary between the co-located VLBI, GPS, and WVR points, the assessment of (systematic) biases between the techniques, the importance of the local tie information used, and the impact of a rigorous combination of troposphere zenith delays and gradients from VLBI and GPS on other parameter types of the solution (e.g., site coordinates).
DE: 1229 Reference systems
DE: 1294 Instruments and techniques
DE: 3394 Instruments and techniques
SC: Geodesy [G]
MN: 2003 Fall Meeting