The influence of different conditions for the static GNSS positioning

V diplomski nalogi predstavljamo rezultate različnih obdelav statične metode izmere, ki smo jo izvedli ob idealnih terenskih pogojih za izvedbo opazovanj GNSS. Terensko izmero GNSS smo naredili v treh serijah in pri tem uporabili instrumente različnih proizvajalcev. Na ta način smo dobili oceno, kakšen vpliv ima kombinacija instrumentov različnih proizvajalcev na določitev položaja točk. Ob pridobivanju opazovanj smo satelitski signal registrirali na podlagi vseh razpoložljivih satelitov z nastavljenim višinskim kotom 0°. Z naknadno obdelavo smo z višanjem višinskega kota simulirali ovire ob sprejemnikih ter opazovali vpliv na določitev baznih vektorjev ter koordinat točk z namenom pridobitve ocene, do kakšnega višinskega kota je vpliv ovir ob sprejemnikih zanemarljiv. Za dani primer smo preverili tudi vpliv uporabljenih različnih tipov efemerid (broadcast in končne precizne) na določanje položaja. Na podlagi obdelav z različnimi intervali registracije in različnim časovnim intervalom trajanja opazovanj smo pridobili oceno, ali je bolj smiselno pridobivati opazovanja dalj časa ali s krajšim intervalom registracije satelitskega signala. Položaje točk, ki smo jih dobili z relativno obdelavo statične izmere GNSS, smo primerjali z absolutno določenimi položaji po metodi PPP. Pri tem smo uporabili spletna programa MagicGNSS in TrimbleRTX ter primerjali rezultate. Na koncu smo na različne načine pridobljene koordinate uporabili v izračunih za oceno vpliva koordinatnih odstopanj na izpeljane količine (dolžine, kote in površine).The thesis presents static processing results of fieldwork GNSS observations performed in nearly ideal conditions. Three sessions of static observations were performed at the field by different combination of GNSS receivers’ usage at the end of the baselines. While obtaining observations the cut-off angle was set on 0°, but during the processing we simulated obstacles near GNSS receivers by increasing cut-off angle. We estimated how the obstacles influence the coordinates and tried to find the answer of which cut-off angle in the presence of obstacles could be negligible. We checked the effect of different types of ephemeris (broadcast and final precise) usage on final coordinate’s determination. Based on different strategy processing results, i.e. different sampling rate as well as shorter observation duration, we studied which factor has more influence on the coordinates’ quality. Coordinates acquired from relative post-processing were further used as the reference for studying the absolute PPP (Precise Point Positioning) post-processing results, where PPP coordinates were calculated by online applications MagicGNSS and TrimbleRTX. Finally, different coordinates were used in distances, horizontal angles and areas calculations to find out how different quality of coordinates affects indirect acquired quantities