HR: 1400h
AN: G43B-09 INVITED     [Abstracts]
TI: VLBI, Ring Laser and Gravity Observations for High-Frequency Polar Motion and Universal Time Variations
AU: * Mendes Cerveira, P J
EM: mendes@mars.hg.tuwien.ac.at
AF: IGG, Vienna University of Technology, Gusshausstrasse 27-29, Vienna, 1040, Austria
AU: Kluegel, T
EM: kluegel@fs.wettzell.de
AF: Bundesamt für Kartographie und Geodaesie BKG, Fundamentalstation Wettzell, Sackenrieder Str. 25, Koetzting, 93444, Germany
AU: Schreiber, U
EM: schreiber@wettzell.ifag.de
AF: Forschungseinrichtung Satellitengeodaesie FESG, Fundamentalstation Wettzell, Sackenrieder Str. 25, Koetzting, 93444, Germany
AU: Velikoseltsev, A
EM: alex@wettzell.ifag.de
AF: Forschungseinrichtung Satellitengeodaesie FESG, Fundamentalstation Wettzell, Sackenrieder Str. 25, Koetzting, 93444, Germany
AU: Meurers, B
EM: bruno.meurers@univie.ac.at
AF: Department of Meteorology and Geophysics, Althanstrasse 14, UZA II, Vienna, 1090, Austria
AU: Schuh, H
EM: harald.schuh@tuwien.ac.at
AF: IGG, Vienna University of Technology, Gusshausstrasse 27-29, Vienna, 1040, Austria
AB: Very Long Baseline Interferometry (VLBI) is exclusively sensitive to the complete rotation matrix from the terrestrial to the quasi-inertial frame, while ring lasers being sensitive to the instantaneous Earth rotation vector in an Earth- fixed frame, i.e., to polar motion and length of day variations. Additionally, assuming a perfect knowledge of mass attraction variations, superconducting gravimeters (SG) permit to detect Earth rotation variations from the magnitude of the local gravity. The formula of the Sagnac frequency and gravity variation caused by the motion of the Earth's body w.r.t. the instantaneous Earth rotation vector will be presented and compared to VLBI parameterization. The potential of a combination of the three independent types of observables will be examined for sub-diurnal polar motion and universal time variations.
DE: 1239 Earth rotation variations
DE: 1294 Instruments and techniques
DE: 1295 Integrations of techniques
SC: Geodesy [G]
MN: 2007 Joint Assembly