IRNSS Current Affairs

ISRO successfully launches 7th navigation satellite IRNSS-1G

The Indian Space Research Organization (ISRO) has successfully launched India’s 7th navigation satellite IRNSS 1G of the Indian Regional Navigation Satellite System (IRNSS).

The satellite was launched into a Sub-Geosynchronous Transfer Orbit (Sub-GTO) on-board of Polar Satellite Launch Vehicle (PSLV) C-33 from Satish Dhawan Space Centre, Sriharikota in Andhra Pradesh.

IRNSS 1G satellite is last space segment satellites of the IRNSS system. With this India joins elite group of selected nations that have their own GPS (Global Positioning System) or navigation system.

Note: IRNSS system is similar to other satellite navigation systems like US’s GPS , Russia’s Glonass, Japan’s Quasi Zenith, Europe’s Galileo and China’s Beidou.

About IRNSS 1G

  • IRNSS 1G satellite has a lift-off mass of 1425 kg.
  • Its configuration is the same as IRNSS-1A, 1B, 1C, 1D, 1E and 1F.
  • Payloads: It equipped with two types of payloads viz. navigation payload and ranging devices.
  • The navigation payload will be mainly used to transmit navigation service signals to the users.
  • The ranging payload consists of a C-band transponder that will facilitate accurate determination of the range of the satellite.

About IRNSS System

  • IRNSS System consists of constellation of seven satellites of which three are geostationary and four are non-geostationary.
  • Four Geosynchronous satellites: They will be orbiting in pairs in two inclined geosynchronous orbits.
  • When observed from the ground, these 2 pairs of satellites will appear to travel in figures of ‘8’.
  • Three Geostationary satellites: They will be placed in the geostationary orbit over the equator.
  • They match the Earth’s rotation and shall remain at a fixed position in the sky.
  • Services: This satellite system aims to provide real-time accurate position information of objects to users across the country and the region, extending up to an area of 1,500 km.
  • It would provide two types of 24/7 standard services (i) Restricted Service (RS): an encrypted service provided to authorised users. It will be used for military and missile-related applications. (ii) Standard Positioning Service (SPS): to all users.
  • Applications: (i) Terrestrial, Aerial and Marine Navigation (ii) Disaster Management (iii) Vehicle tracking and fleet management (iv) Integration with mobile phones (v) Precise Timing (vi) Mapping and Geodetic data capture (vii) Terrestrial navigation aid for hikers and travellers (viii) Visual and voice navigation for drivers.

Earlier the six satellites of the series namely IRNSS-1A, 1B, 1C, 1D, 1E and 1F were launched in July 2013, April 2014, October 2014, March 2015, January 2016 and March 2016 respectively. It will become operational after checking the systems-space (satellites), ground (ground stations) and the user end signal receivers.

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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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