Deformation Monitoring Using Satellite Methods
Deformation monitoring using Global Navigation Satellite Systems (GNSS) is a reliable technique today but requires strict standards in data processing and analysis. The procedure for determining the precise positioning and deformation analysis in the test network located nearby the Olympic stadium Koševo in Sarajevo, with an area of about 1 km square, is described. The observations are carried out using dual-frequency GNSS receivers and data are processed using by Trimble Business Center v4.00 software. The analysis is focused on comparing several variants of observation processing: GPS L1, GPS L1 + L2 and GNSS (GPS + GLONASS). Software OS JAG3D is used for deformation analysis. The results show that the reliability of the deformation estimated based on the GPS L1 variant is questionable since it does not detect displacements at all points. The second variant gives better results. The mean values of the differences of the determined simulated displacements are by components: 3 mm, 3 mm and 6 mm. The results determined using the third variant, i.e. GNSS, are the best, when the mean values of the displacement´s differences are: 4 mm, 3 mm and 2 mm, what indicates the recommendation to use this method in a project where high precision is required.