Navigational satellite 'IRNSS 1B' successfully launched

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India has taken another significant step towards the dream of having it own Satellite Navigation System with the successful launch of IRNSS 1B- 2nd of the 7 satellites constituting the Indian Regional Navigational Satellite System (IRNSS). The satellite, bound to join its predecessor IRNSS-1A at a longitude of 55 degrees east, was launched from Satish Dhawan Space Centre at Sriharikota.


  • The satellite weighs 1,432 kilograms (614 kg without fuel) and is expected to have a mission life of 10 years.
  • It was projected into space aboard the "Polar Satellite Launch Vehicle" C24.
  • It was the 26th (22nd successful in a row) PSLV mission since its beginning in 1993. 
  • ISRO plans launch of 2 more IRNSS satellites, the 2nd pair, by the end of this year and hope to put all the seven in orbit by mid-2015.

Indian Regional Navigation Satellite System (IRNSS)

  • The IRNSS system will consist of three geostationary satellites and two pairs of spacecraft in inclined geosynchronous orbits.
  • This launch has put the first pair of satellites with inclined geosynchronous orbits successfully in the space.
  • The second pair will be deployed at 111 degrees east, while the 3 geostationary satellites take up positions at 34, 83 and 132 degrees.

More about the mission

  • Will have a range of 1500km (thus neighbouring countries like Nepal, Srilanka would also be able to use)
  • Positional accuracy of better than 20 metres in the "primary service area" (i.e 1500km)


  • 1) Standard Positioning Service : Available for all users
  • 2) Restricted Service : encrypted service (only for authorised users like Military and other government agencies)

Some Applications (where it will be useful once all 7 satellites are in space):

  • Will provide accurate position information service to users (precise timing ), disaster management, Navigation : (marine, aerial, terrestrial), aid to hikers, mountaineers, trekkers and other travellers.
  • Vehicle tracking ; visual-voice navigation in driving; fleet management, mapping and geodetic data capture, together with many other applications when integrated with mobile phones.

Other Navigational Satellite Systems in the world

  • Global Orbiting Navigation Satellite System (GLONASS) : Russia,
  • Global Positioning System (GPS) : United States,
  • Galileo (GNSS) : European Union,
  • BeiDou satellite navigation system (COMPASS) : China
  • Quasi-Zenith Satellite System : Japan

The Satish Dhawan Space Centre

  • Named in the honour of former ISRO chairman (1972-84) 'Satish Dhawan' in 2002 after his death.
  • Earlier it was known as Sriharikota High Altitude Range (SHAR). 

ISRO Chairman :  Koppillil Radhakrishnan

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