Geocenter motion analysis using GNSS and DORIS radio satellite system measurements

Results are presented of the geocenter motion determination obtained at the Institute of Astronomy, Russian Academy of Sciences (INASAN) as a result of the processing of the radio space geodesy techniques measurements, namely Global Navigation Satellite Systems (GNSS) and DORIS system. GNSS data were processed for the time period 2008.0-2016.0 using measurements from 54 stations of the International GNSS Service (IGS) network equipped by dual-system GPS+GLONASS receivers. PPP (Precise Point Positioning) method is used for the GNSS data processing. DORIS data were processed for the time interval 1993.0-2017.0 for all working International Doris Service (IDS) stations. Time series of the geocenter motion for GNSS and DORIS data were derived using geometrical method so-called "network shift approach". In order to estimate amplitudes, periods and phases of geocenter variation the FAMOUS (CNES, France) software package was applied. The INASAN evaluated amplitudes and phases of annual geocenter variations derived from satellite method are in a good agreement with those obtained by other different space geodesy groups and geophysical models.