Identification of the spatial position of permanent GPS stations in the Baltic region
Since the last decade of the 20th century, data on repeated measurements from the Global Positioning System (hereinafter referred to as GPS) have been commonly used globally to investigate the motion of the Earth's crust. With the use of data on repeated measurements in GPS networks (coordinates of GPS network stations, lengths of spans between the GPS stations or other changes of elements), it is possible to detect horizontal motions of the Earth crust that take place in the period between repeated measurements. The most elementary way of detecting the motions of the Earth's crust is a comparison of the coordinates of identical stations of geodetic networks found on geodetic measurements carried out at different moments. The object of this research is the identification of the spatial position of permanent GPS stations, i.e. changes in spatial coordinates within a certain period.