Modelling and analysis of the ionospheric impact on observables in low earth orbit monitoring systems for gnssZdelar, Dominik (Avtor) Gleich, Dušan (Mentor) Karner, Timi (Mentor) ionosphereGNSSmodelMEOLEOIonospheric errors in the ionosphere are a major source of signal delays in Global Navigation Satellite System (GNSS) propagation, particularly in the 250-400 km region of the ionosphere, where high electron density occurs. This thesis develops a model to estimate electron density at 300 km, focusing on improving predictions of ionospheric delays in signal paths between Medium Earth Orbit (MEO) and Low Earth Orbit (LEO) satellites. The model utilizes simulated orbits on specific dates to account for varying solar flux strengths and compares results with data from the Swarm mission. The findings aim to enhance GNSS delay estimation and navigation accuracy regarding ionospheric errors.D. Zdelar20242024-12-12 13:22:02Magistrsko delo/naloga91323UDK: 629.056.8:52-853(043.2)COBISS_ID: 226884099sl