HR: 16:00h
AN: G34A-01 INVITED     [Abstracts]
TI: Determination of geocenter motion with Satellite Laser Ranging data: methods, models, results and systematic errors
AU: * Luceri, V
EM: cinzia.luceri@asi.it
AF: Telespazio S.p.A. , Centro di Geodesia Spaziale, C.da Terlecchia, Matera, 75100 Italy
AU: Sciarretta, C
EM: cecilia.sciarretta@asi.it
AF: Telespazio S.p.A. , Centro di Geodesia Spaziale, C.da Terlecchia, Matera, 75100 Italy
AU: Bianco, G
EM: giuseppe.bianco@asi.it
AF: Agenzia Spaziale Italiana, Centro di Geodesia Spaziale, C.da Terlecchia, Matera, 75100 Italy
AB: Mass redistribution within the Earth affects the position of its center of mass whose translation, relative to the International Terrestrial Reference Frame (ITRF), ranges from a few millimetres to centimetres. Satellite space geodetic techniques are able to detect such geocenter motion, Satellite Laser Ranging (SLR) being the most accurate in this respect, since it has produced a long history of valuable observations which are particularly sensitive to the origin of the reference frame. The most recent and updated ASI/CGS analyses of Lageos-1 and Lageos-2 SLR data span two decades and provide time series of fortnightly geocenter offsets with respect to the ITRF. Two different methods have been applied to retrieve the time series: a direct estimation of the degree one geopotential harmonics and a computation of Cartesian coordinate offsets from ITRF. Models and results, together with accuracies and spectral content, will be shown and discussed.
DE: 1247 Terrestrial reference systems
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting