CGS Geocenter Time Series from SLR and GPS Data

The geocenter motion is the translation motion of the Earths centre of mass as viewed from a crust fixed frame. In order to estimate the geocenter motion we have analysed SLR and GPS data with different approaches to define the best analysis proeedure for the estimation of this parameter. The name used to identify the different data analysis procedures are absolutely conventional for this document; we defined geometric and gravitational the procedures used in SLR data analysis, while the methods used in GPS data analysis are defined as geometric and direct. With the gravitational and the direct methods we directly estimate the time series of the geocenter motion, while following the geometric method these parameters are obtained by a Helmert transformation