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Accuracy wrt US, Russian and Chinese navigational systems?
IRNSS is purely autonomous regional satellite navigational system.The requirement of IRNSS is driven by the fact that access to Global Navigation Satellite Systems, GPS, is not guaranteed in hostile situations.Indian IRNSS system is mainly design to agumented IMPROVEMENT of positioning co-ordinate signal recive by GPS and GOLNASS.
In other words it will receive GPS and GOLNASS signal , inhance them and then transmit a more accurate signal to its receiver.
So basically its signal inhancer and Local co-ordinate positioning system.
So GAGAN is ready get launched
IRNSS is purely autonomous regional satellite navigational system.The requirement of IRNSS is driven by the fact that access to Global Navigation Satellite Systems, GPS, is not guaranteed in hostile situations.GAGAN(GPS-aided geo-augmented navigation) is already in operational status.
GLONASS - 4.467.38 m depending on NSV (7-8)
GPS -2.008.76 m depending on NSV (6-11)
GLONASS + GPS - 2.374.65 m depending on NSV (14-19)
GLONASS' accuracy is expected to improve upto 0.6 m or better by 2020.
NSV is navigation space vehicle or you can say sats communicating with receiver.
Above datas are for military grade signals which are encrypted.Civilian signals has lower accuracy.
FOR Civilian Use
GPS - 5-20m
GLONASS-50-70m
There is no use of IRNSS without covering large area at least the Indian Ocean region which is our Navy's operating zone.