HR: 0800h
AN: G41B-0358    [Abstracts]
TI: A Weekly-Updated TRF From Satellite Laser Ranging
AU: Kuzmicz-Cieslak, M
EM: magda@umbc.edu
AF: JCET/UMBC and NASA Goddard, 1000 Hilltop C., Acad IV A, 114E, Baltimore, MD 21250 United States
AU: * Pavlis, E C
EM: epavlis@umbc.edu
AF: JCET/UMBC and NASA Goddard, 1000 Hilltop C., Acad IV A, 114E, Baltimore, MD 21250 United States
AU: Pavlis, D E
EM: dpavlis@sgt-inc.com
AF: SGT, Inc. and NASA Goddard, 7701 Greenbelt Rd., #400, Greenbelt, MD 20770 United States
AB: Since over two decades now, Satellite Laser Ranging (SLR) data contribute to the definition of the Terrestrial Reference Frame (TRF). Until the development of ITRF2000, the contributions were submitted in the form of a set of normal equations or a covariance matrix and a set of station coordinates and their linear rates at a standard epoch. The development of ITRF2004 is based on weekly contributions, which allow greater flexibility in the relative weighting and the combination of information from various techniques. Over the last few years we have developed a process based on these weekly contributions, to develop a weekly-updated multi-year TRF definition incrementally. We are adding every week the new weekly data set to the previously accumulated normal equations, thereby extending the validity of the TRF and at the same time, incorporating all the available observations to that date. This weekly update of the underlying mean TRF allows us to incorporate new stations as they join the network, maintain accurate to the week station positions, monitor the variations of the origin (geocenter), the scale and enabled the accurate observation of several significant geophysical events, recent and in the past, involving mass motion in the hydrosphere and the solid Earth. We have now implemented improvements in the analysis methodology and the underlying models, used in a new series of weekly results, consistent with the recently adopted IERS Conventions 2003, and using the latest improvements in modeling SLR observations. We will present our results from several years of LAGEOS 1 and 2 and ETALON 1 and 2 SLR data, assess the accuracy of the TRF and discuss the stability of the weekly process and the convergence of the results.
DE: 1218 Mass balance (0762, 1223, 1631, 1836, 1843, 3010, 3322, 4532)
DE: 1223 Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions (0762, 1218, 3319, 4550)
DE: 1229 Reference systems
DE: 1239 Earth rotation variations
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
SC: Geodesy [G]
MN: Fall Meeting 2005