ISRO successfully launches fourth navigation satellite IRNSS 1D

Indian Space Research Organization (ISRO) on 28 March 2015 successfully launched fourth navigation satellite Indian Regional Navigation Satellite System (IRNSS)-1D.
It was launched by Polar Satellite Launch Vehicle (PSLV) C-27 into the orbit from Satish Dhawan Space Centre, Sriharikota in Andhra Pradesh.
The satellite is similar to, and follows the IRNSS 1A, 1B and 1C which were launched in April 2013, July 2014 and October 2014respectively.
IRNSS-1D will be launched into a sub Geosynchronous Transfer Orbit (sub GTO). It weighs 1,425 kg and carries a navigation payload and CDMA ranging payload in addition with a laser retro-reflector.

About IRNSS series

  • IRNSS is a navigation system that will cover India, and also extend 1,500 kms from its boundaries.
  • It will provide accurate position information to users in India. Basically it will provide two kinds of services, Standard Positioning Services, which is available to all users, and an encrypted service that is provided only to authorized users.
  • The complete IRNSS system will include three satellites in geostationary orbit and four satellites in geosynchronous orbit at an altitude of 36,000 km above the Earth.
  • The deployment of all the satellites was expected to be completed by 2015 at a cost of Rs. 1,420 cr.

IRNSS is similar to other satellite navigation service providers like USA’s GPS (Global Positioning System), Russia’s Glonass, Europe’s Galileo, Japan’s Quasi Zenith and China’s Beidou.
Applications of IRNSS

  • Terrestrial, Aerial and Marine Navigation.
  • Disaster Management.
  • Vehicle tracking and fleet management.
  • Integration with mobile phones.
  • Precise Timing.
  • Mapping and Geodetic data capture.
  • Terrestrial navigation aid for hikers and travellers.
  • Visual and voice navigation for drivers.



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