7th Navigation Satellite IRNSS-1G

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On 28 April 2016, Indian Space Research Organization(ISRO) successfully launched India’s 7th navigation satellite of the India Regional Navigation Satellite System (IRNSS 1G) into a sub-Geosynchronous Transfer Orbit (Sub-GTO) on board of polar Satellite Launch Vehicle (PSLV) C-33 from Satish Dhawan Space Centre, Sriharikta in Andhra Pradesh.
            IRNSS-1G satellite is last space segment satellites of the IRNSS system and with this launch, India joins elite group of selected countries that have their own GPS (Global Positioning System) or navigation system.
            IRNSS-1G is the 7th navigation satellite of the seven satellites constituting the IRNSS space segment. Its predecessors, IRNSS-1A, 1B, 1C, 1D, 1E and 1F were launched by PSLV-C22, PSLV-C24, PSLV-C26, PSLV-C27, PSLV-C31 and PSLV-C32 in July 2013, April 2014, October 2014, March 2015, January 2016 and March 2016 respectively. Like all other IRNSS satellites, IRNSS- 1G also has a lift-off mass of 1425kg. The configuration of IRNSS-1G too is the same as IRNSS-1A, 1B, 1C, 1D, 1E and 1F.
About IRNSS System:
·         IRNSS consists of seven satellites to provide real-time data on the position of the objects to aid road, air, and maritime traffic apart from providing mapping and tracking services.
·         It is an independent regional navigation satellite system designed to provide position information in India region and 1500 km around the Indian mainland.
·         It would provide two types of services, namely Standard Positioning Services (SPS),which will be provided to all users, and Restricted Services (RS) that will be provided to authorized user only.
·         Out of seven satellite of the system, three are Geostationary and four are non-geostationary.
·         By using the IRNSS as a platform, the Government of India is planning to lunch its own Global Navigation Satellite Services, GINS (Global Indian Navigation System).
·         While many countries in the world have more than 20 satellites is serving the navigational purpose Indian scientist can boast of by achieving the goal by launching the seventh satellite which in way completes the constellation which was earlier planned. This constellation will help from the civilian needs to security or defence needs.
Payloads:
The satellite with a design life span of 12 years has two payloads for navigation and ranging.
1.      Navigation payload: It will transmit navigation service signals to the users. This payload will be operating in L5-band and S-band. A highly accurate Rubidium atomic clock is the part of the navigation payload of the satellite.
2.      Ranging payload: It consists of a C- band transponder which facilitates accurate determination of the range of the satellite.

Mr. Ambuj Kumar Gautam (Mechanical Engineering Department)


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