GNSS that provide enhanced accuracy and integrity monitoring usable for civil navigation are classified as followsGNSS-1 is the system and is the combination of existing satellite (GPS and GLONASS), with Satellite Based Augmentation Systems (SBAS) or Ground Based Augmentation Systems (GBAS). In the United States, the satellite based component is the Wide Area Augmentation System (WAAS), in is the Mulfirst generation ti-Functional Satellite Augmentation System (MSAS). Ground based augmentation is provided by systems like the Local Area Augmentation System (LAAS).
GNSS-2 is the second generation of systems that independently provides a full civilian satellite navigation system, exemplified by the European Galileo Europe it is the European Geostationary Navigation Overlay Service (EGNOS), and in Japan it positioning system. Thesnavigation systems e systems will provide the accuracy and integrity monitoring necessary for civil navigation. This system consists of L1 and L2 frequencies for civil use and L5 for system integrity. Development is also in progress to provide GPS with civil use L2 and L5 frequencies, making it a GNSS-2 system.¹
Core Satellite navigation systems, currently GPS, Galileo and GLONASS.
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