In the thesis we analyse the quality of coordinate determination in the SIGNAL network at higher elevations with three GNSS surveying methods: static, VRS and MAC, in real time as well as with postprocessing. All the observations were taken at Krvavec area at the height of approximately 1500 m above sea level. Firstly we compare the coordinates obtained with the VRS and MAC surveying methods with coordinates computed on the basis of post-processing of static observations. Secondly we compare the coordinates computed on the basis of post-processing virtual reference station data generated for different heights above sea level. The quality of coordinates we use as a measure of tropospheric refraction modelling quality in the SIGNAL network and also as a criterion of applicability of surveying methods at higher elevations. On the basis of our analysis, we may say that the MAC concept enables coordinates at the quality level of static method and that MAC concept enables coordinates of higher quality than VRS concept. We have also shown that Hopfield and Saastamoinen models of tropospheric refraction are suitable at higher eleveations above sea level.