Context: 

The Indian Space Research Organisation (ISRO) launched the first of the second-generation satellites for its navigation constellation successfully.

About the second-generation satellites:

About Navigation with Indian Constellation (NavIC):

• To meet the positioning, navigation and timing requirements of the nation, ISRO has established a regional navigation satellite system called Navigation with Indian Constellation (NavIC). 
• NavIC was erstwhile known as Indian Regional Navigation Satellite System (IRNSS).
• NavIC is designed with a constellation of 7 satellites and a network of ground stations operating 24 x 7. 
• Three satellites of the constellation are placed in geostationary orbit, and four satellites are placed in inclined geosynchronous orbit.
• The ground network consists of a control centre, precise timing facility, range and integrity monitoring stations, two-way ranging stations, etc.
• Each of the seven satellites currently in the named NavIC, weighed much less — around 1,425 kg — at liftoff. 
  • They all rode the lighter Polar Satellite Launch Vehicle (PSLV), ISRO’s workhorse launch rocket.

Services Offered: 

• Types of services: Standard Position Service (SPS) for civilian users and Restricted Service (RS) for strategic users. 
• Frequency bands: These two services are provided in both L5  and S bands.
• Coverage: The NavIC coverage area includes India and a region up to 1500 km beyond the Indian boundary. 
• Accuracy: NavIC signals are designed to provide user position accuracy better than 20m and timing accuracy better than 50ns.
• Signals interoperability: NavIC SPS signals are interoperable with the other global navigation satellite system (GNSS) signals namely GPS,Glonass,Galileo, and BeiDou.
• Constant speed: Unlike GPS, NavIC uses satellites in high geo-stationery orbit — the satellites move at a constant speed relative to Earth, so they are always looking over the same region on Earth.

News Source: Indian Express