PSLV-C27 Successfully Launches India’s Fourth Navigation Satellite IRNSS-1D

ISRO`s Polar Satellite Launch Vehicle, PSLV-C27, recently successfully launched the 1425 kg IRNSS-1D, the fourth satellite in the Indian Regional Navigation Satellite System (IRNSS). This is the twenty eighth consecutively successful mission of the PSLV.

  • IRNSS-1D is the fourth of the seven satellites constituting the space segment of the Indian Regional Navigation Satellite System. IRNSS-1A, 1B and 1C, the first three satellites of the constellation, were successfully launched by PSLV on July 02, 2013, April 04, 2014 and October 16, 2014 respectively.

About Indian Regional Navigation Satellite System:

  • IRNSS is an independent regional navigation satellite system being developed by India. It is designed to provide accurate position information service to users in India as well as the region extending up to 1500 km from its boundary, which is its primary service area.
  • The IRNSS with a 1500km range will make India self-reliant on navigation and surveillance from outer space as it is expected to cover the Asian region.
  • IRNSS will provide two types of services, namely, Standard Positioning Service (SPS) which is provided to all the users and Restricted Service (RS), which is an encrypted service provided only to the authorised users. The IRNSS System is expected to provide a position accuracy of better than 20 m in the primary service area.


  • IRNSS comprises of a space segment and a ground segment. The IRNSS space segment consists of seven satellites, with three satellites in geostationary orbit and four satellites in inclined geosynchronous orbit. IRNSS- 1A, the first satellite of the IRNSS constellation, has already started functioning from its designated orbital slot after extensive on orbit test and evaluation to confirm its satisfactory performance.
  • IRNSS ground segment is responsible for navigation parameter generation and transmission, satellite control, ranging and integrity monitoring and time keeping.

Applications of IRNSS:

  1. Terrestrial, Aerial and Marine Navigation
  2. Disaster Management
  3. Vehicle tracking and fleet management
  4. Integration with mobile phones
  5. Precise Timing
  6. Mapping and Geodetic data capture
  7. Terrestrial navigation aid for hikers and travellers
  8. Visual and voice navigation for drivers
  9. Global Navigational Systems:
  • As of April 2013, only the United States NAVSTAR Global Positioning System (GPS) and
  • The Russian GLONASS are global operational GNSSs.
  • China is in the process of expanding its regional Beidou navigation system into the global Compass navigation system by 2020.
  • The European Union’s Galileo positioning system is a GNSS in initial deployment phase, scheduled to be fully operational by 2020 at the earliest.
  • France (DORIS), India,
  • Japan are in the process of developing regional navigation systems.

Sources: PIB, ISRO, Wiki.


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