Fourth navigation satellite launch in March

The fourth navigation satellite of the country is getting ready for launch in March, and it will be another step forward for India in evolving its own navigation satellite system and not depend on the Geographical Positioning System (GPS) service of the U.S. Cryogenic propulsion systems on board PSLV-C27 rocket that will launch the satellite are being developed by scientists of the ISRO Propulsion Complex at Mahendragiri in Tirunelveli district. S. Ingersol, group director of the complex, told The Hindu, “Totally, seven satellites are required to be launched to complete the configuration under the Indian Regional Navigation Satellite System (IRNSS) and already three had been launched. More

(Source: The Hindu - Jan 12)