LONG TERM MONITORING OF GEOPHYSICAL PARAMETERS USING SLR

The SLR observation dataset, similarly to the other space geodetic techniques, is a valuable source of data for measuring fundamental geophysical parameters and their temporal variations with respect to different time scales. As an example, the distinctive sensitivity of the SLR technique to global parameters as the origin and scale of the Terrestrial Reference Frame profits from the remarkable length of its observations dataset, allowing the stable and accurate retrieval of those parameters, turning into a reliable maintenance of the TRF. The most recent and updated ASI/CGS analyses of Lageos-I and Lageos-II data cover two decades and provide time series of daily Earth Rotation Parameters (EOP) and Length Of Day (LOD), weekly geocenter offsets with respect to the TRF, weekly J2 estimates, station coordinates and velocities together with orbital parameters, biases, and other technique-based nuisance parameters. The complex interrelation among all the parameters allows the crosschecking and helps in detecting real geophysical signals from the parameters time series. Some of the results coming out from the solutions are shown, with particular emphasis to the terrestrial reference frame monitoring. Comparisons are made with the standard IERS references.