Global navigation satellite systems.

摘要: Abstract Global positioning systems first became available for private use in 1995. Since the introduction of NAVSTAR-GPS (Navigation System with Time and Ranging–Global Positioning System) GLONASS (Globaluaya Navigatsionnaya Sputnikovaya Sistema, Navigation Satellite System), such have quickly become indispensable a wide range applications. Above all, GPS is used today by large user community. Artificial augmentations can be to improve performance terms accuracy, availability integrity. In space-based augmentations, differential correction data, integrity information additional ranging signals are transmitted from geostationary satellites. ground-based reference station (based on geo-referenced position) compares position solution (calculated SatNav real coordinates. that case, data telemetric system roving receivers near station. Both augmentation techniques based generic satellite navigation or GLONASS, dependent source system. To overcome dependency civil European community upon foreign military systems, an initiative build up autonomous own-space segment was initiated. 1999, realisation this project has been way, employment new system, named Galileo, currently expected 2008.