Before revision: Classification GNSS systems that provide enhanced accuracy and integrity monitoring usable for civil navigation are classified as follows: GNSS-1 is the first generation system and is the combination of existing satellite navigation systems (GPS and GLONASS), with Satellite Based Augmentation Systems (SBAS) or Ground Based Augmentation Systems (GBAS).
After revision: Classification GNSS systems that provide enhanced accuracy and integrity monitoring usable for civil navigation are classified as follows: is the first generation system and is the combination of existing satellite navigation systems (GPS and GLONASS), with Satellite Based Augmentation Systems (SBAS) or Ground Based Augmentation Systems (GBAS).