Whats the difference b/w NAVIC and GAGAN ?
Also unless govt makes a rule like chinks that all phones sold in Bharath must use NAVIC, there will never be any adopters
The GPS-aided GEO augmented navigation (GAGAN) is an implementation of a regional satellite-based augmentation system (SBAS). It is a system to improve the accuracy of a GPS receiver by providing reference signals.
In SBAS support wide-area or regional augmentation is achieved through the use of additional satellite-broadcast messages. Using measurements from the ground stations, correction messages are created and sent to one or more satellites for broadcast to end users as differential signal.
NavIC is a satellite navigation system that provides accurate real-time positioning and timing services. Their is no dependency ground stations as such. Each NavIC satellite has an atomic clock for timing reference.
GAGAN has an accuracy of 3 m over Indian airspace. Deployment of GAGAN is limited by ground stations. It is mainly used by civilian airline industry.
NavIC absolute position accuracy of better than 10 metres throughout the Indian landmass and better than 20 metres in the Indian Ocean as well as a region extending approximately 1,500 km around India. We are working on expanding the coverage of NavIC from regional to global however GAGAN can't offer global coverage under any circumstance due to its architectural limitation.
During conflict GAGAN is more vulnerable compare to NavIC.