GEONAS (GEOdynamic Network of the Academy of Sciences) is a network of permanent GNSS stations performing continuous observation of geodynamic movements in Czechia. GEONAS started operating in 2001 with two stations (on Sněžka and Biskupská kupa). It currently includes 20 permanent stations, four of which have been integrated into the permanent EUREF EPN network. All stations operate with a sampling frequency of 30 seconds. The configuration was designed to cover different geological structures. Long-term monitoring on the GEONAS network lasting more than 10 years enables a thorough analysis of geodynamic movements in the Bohemian Massif. Although from a geodynamic point of view the territory of the Bohemian Massif is a stable area, data from 18 operating permanent stations of the GEONAS network, supplemented by data from permanent stations of the VESOG network and commercial network TopNet, provide a sufficient database for detailed investigation of movement trends and cover most geodynamically active territory of the Bohemian Massif.
The stations are equipped with old Aschtec Z-18 and Topcon GB1000 receivers, capable of tracking US NAVSTAR GPS satellite signals as well as Russian GLONASS satellite signals. Some stations are equipped with new Topcon NET-G3A receivers, which will be able to monitor the signals of the newly built EU Galileo system in the future. All stations are connected online to the IRSM operations centre, where the recorded data are automatically checked. Data processing is performed using the Bernese software package.