India becomes fifth country to have its own GPS

- Puneet Yadav   03-05-2016


28th April 2016 became a memorable day for ISRO(Indian Space research organisation ) and India .On this day ISRO's Polar Sattelite Launch Vehicle -PSLV C33 successfully launched the IRNSS- 1G , seventh and final satellite in the Indian Regional Navigational Satellite system(IRNSS).

This made India fifth country in the world who have their own Satellite Navigation Network. IRNSS is basically Global positioning Satellite (GPS) which will be used for terrestrial and marine navigation , disaster management, navigation for sailors, fleet management and vehicle trafficking,integration with mobile phones ,mapping and geodetic data . The Global Positioning System (GPS) is a space-based navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites

The satellite was launched from Satish Dhawan Space Centre SHAR, Sriharikota 110 km from Chennai. Before IRNSS 1G ISRO has launched six satellite between 2 JULY 2013 to 10 March 2016. IRNSS is meant for providing position information in India and 1500 km around the Indian mainland. It will provide two types of services namely Standard positioning services (SPS) which will be available to all users, besides restricted serviced provided to authorized users. 

The satellite weighs 1425 kg and has a working life of 12 years with two payloads of navigation and ranging. The PSLV was 44.4 metres long and weighed 320 tonnes. The satellite will transmit signal on L5 and S band . A rubidium atomic clock is fixed in the navigation payload. This Indian version of navigational satellite is very much important from defence point of view because in the time of war the countries who have their own navigation satellite need not be dependent on other countries who might be also a part of war. The total cost of this entire project is approximately 1420 crores. Each satellite costs nearly 150 crores .

After a flight of approximately 20 minutes the satellite separated from PSLV at a height of 488.9 km. From there onwards the control of the satellite was taken by Mission Control Facility at Hassan in Karnataka. MCF will control upto the four orbit maneuvering of the satellite to place the satellite in geostationary orbit at 129.5 degree east latitude. 

 After the satellite was launched Prime Minister who watched live launching through video link congratulated ISRO and its scientists for their achievement and said that this would make India independent in Satellite Navigation system .Hailing the feat of ISRO's completing the constellation of seven navigational satellite PM Modi dedicated this IRNSS as NavIC ( Navigation indian constellation). Appreciating the contribution of ISRO he said that it will change the life of common man.    

Apart from India countries who have their own Navigation satellite network are Japan , USA ,China ,Russia . Considering this Navigation network in India through satellite there has been ground facilities for satellite ranging and monitoring,navigation and transferring across eighteen locations in India . According to ISRO officials it will take approximately three to four months to fully operate this satellite navigation system.They will declare it fully operational once they will get sure that space satellite, ground stations and user end receivers are properly functioning.Then user end receivers industry will get into making of receivers equipment.

The head of ISRO is A.S Kiran kumar said “the launch was successful”.Overall this achievement of ISRO will take India into independency towards Satellite Navigation which will be a sign of making one more step towrads rising influence of India in space technology. There is still far more to go.


Keywords : ISRO, Indian GPS , Polar Sattelite Launch Vehicle -PSLV