Application for analysis of availability of RINEX files

Ovaj rad proučava globalne satelitske navigacijske sustave (GNSS) i njihovu primjenu u preciznom pozicioniranju. Sustavno su analizirane mreže GNSS postaja te metode pristupa arhivima RINEX datoteka na internetu. RINEX, kao standardni format za razmjenu podataka, pruža dragocjene informacije za geodetske, geološke i atmosferske analize. Također, opisani su različiti sustavi GNSS, uključujući GLONASS, Galileo, BeiDou i IRNSS, s posebnim osvrtom na njihovu povijest, način rada i uporabu. Poseban naglasak stavljen je na razvoj programskog rješenja koje omogućava korisnicima da za odabrano vremensko razdoblje analiziraju dostupnost RINEX datoteka različitih prijamnih postaja. Osim toga, opisani su načini preuzimanja RINEX datoteka s različitih servera, poput UNAVCO i EUREF. Kroz ovaj rad, korisnici dobivaju mogućnost interaktivnog biranja GNSS postaja i vremenskih razdoblja, a program omogućava automatizirano preuzimanje i analizu RINEX datoteka, pružajući korisniku uvid u globalnu infrastrukturu GNSS-a.This work examines Global Navigation Satellite Systems (GNSS) and their application in precise positioning. GNSS station networks and methods for accessing online archives of RINEX files have been systematically analyzed. RINEX, as a standard format for data exchange, provides valuable information for geodetic, geological, and atmospheric analyses. Furthermore, various GNSS systems, including GLONASS, Galileo, BeiDou, and IRNSS, have been described, with a special emphasis on their history, mode of operation, and usage. A particular focus has been placed on the development of a software solution that allows users to analyze the availability of RINEX files from various receiving stations for a selected time period. Additionally, methods for downloading RINEX files from various servers, such as UNAVCO and EUREF, have been outlined. Through this work, users gain the ability for interactive selection of GNSS stations and time periods, and the program enables automated downloading and analysis of RINEX files, providing the user with insight into the global infrastructure of GNSS