Positioning quality estimation in the SIGNAL network at higher elevations

V nalogi smo analizirali kakovost določitve koordinat v omrežju SIGNAL na večjih nadmorskih višinah s tremi metodami izmere GNSS: statično, VRS in MAC. v realnem času in z naknadno obdelavo opazovanj. Vsa opazovanja smo opravili na območju Krvavca na nadmorski višini približno 1500 m. V prvi fazi smo primerjali koordinate določene z VRS in MAC metodama izmere s koordinatami določenimi s statično metodo izmere. V drugi fazi pa smo primerjali koordinate določene z naknadno obdelavo opazovanj za virtualne referenčne postaje, določene na različnih nadmorskih višinah. Kakovost koordinat smo obravnavali kot merilo kakovosti modeliranja troposferske refrakcije v omrežju SIGNAL, ter tudi kot merilo uporabnosti metod izmere na večjih nadmorskih višinah. Z analizo naših meritev smo ugotovili, da je kakovost koordinat, določenih s konceptom MAC primerljiva s kakovostjo koordinat določenih s statično metodo, ter da je kakovost koordinat določenih s konceptom MAC višja od koordinat določenih s konceptom VRS. Pokazali smo tudi, da sta modela troposferske refrakcije Hopfield in Saastamoinen primerna za uporabo na višjih nadmorskih višinah.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