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PSLV-C31 launches IRNSS-1E

PSLV-C31 launches IRNSS-1E

IRNSS-1E was successfully put into orbit by PSLV-C31 from the Satish Dhawan Space Centre (SDSC), SHAR, Sriharikota. It was the fifth of the seven satellites of the Indian Regional Navigation Satellite System (IRNSS) that will make the constellation. The remaining two are scheduled to be launched before March this year.

With this launch, India moved a step closer to completing its network of satellites that will form a space-based regional navigation system providing location services over India and neighbouring areas. It will provide an alternative to the US-developed GPS, or global positioning system that is so commonly used in a variety of applications.

The constellation had already started working after the launch of the fourth satellite in March last year, the minimum number required to make the system operational.

The development of IRNSS & GAGAN (GPS-Aided Geo Augmentation Navigation) is going side by side. Gagan is meant for navigation services for civil aircraft over the Indian region. It also provides services to other sectors like highways, railways, maritime transport, survey, telecom, etc. The plan is to integrate IRNSS and GAGAN with Bhuvan, a satellite-based mapping service for the Indian mainland developed by Indian Space Research Organisation (ISRO) a few years ago.


  • The satellite was placed in Geosynchronous orbit.
  • The configuration of IRNSS-1E is similar to that of IRNSS-1A, 1B, 1C and 1D launched by PSLV-C22, PSLV-C24, PSLV-C26 and PSLV-C27 in July 2013, April 2014, October 2014 and March 2015 respectively.
  • IRNSS-1E satellite will have two payloads: a navigation payload and CDMA ranging payload in addition with a laser retro-reflector.
  • The ranging payload consists of a C-band transponder which facilitates accurate determination of the range of the satellite.
  • It also carries Corner Cube Retro Reflectors for laser ranging.
  • The payload generates navigation signals at L5 and S-band.
  • The design of the payload makes the IRNSS system interoperable and compatible with GPS of USA & Galileo of EU.
  • The satellite is powered by two solar arrays, which generate power up to 1,660 watts, and has a designed life-time of twelve year


  • IRNSS, an independent and indigenously developed regional navigation satellite system of India.
  • It will provide accurate real-time positioning and timing services over India and region extending to 1500 km around India.
  • The system is expected to provide a position accuracy of better than 20 metre in the primary service area.
  • The fully deployed IRNSS system consists of 3 satellites in GEO orbit and 4 satellites in GSO orbit, approximately 36,000 km altitude above earth surface.
  • Need of IRNSS:
  1. To reduce dependency over foreign GPS system
  2. To meet our strategic need in times of hostile conditions, as happened to the Indian military depending on US GPSduring Kargil War.

Navigation system of world

  1. GPS-Global Positioning System-USA
  2. GPS- Galileo Positioning System-EU
  3. GLONAS-Russia
  4. BeiDou- China
  5. COMPAS-China
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