Last satellite of IRNSS launched in to orbit

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The Indian Space Research Organisation (ISRO) has successfully launched the seventh and final satellite IRNSS-1G  of Indian Regional Navigation Satellite System (IRNSS) constellation. 

With this launch, the IRNSS constellation of seven satellites is now complete and now ISRO will focus on the process of designing front end chips which will receive the navigational signals sent out by the satellites.

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.

The seventh and final satellite of the Indian Regional Navigation Satellite System, the IRNSS 1G, was launched into a sub geosynchronous transfer orbit with a perigree (nearest point to earth) of 284 km and an apogee (farthest point to earth) of 20,657 km.

Why we need our own satellite navigation systems ?

Prior to this 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. 


All satellites will undergo stabilisation testing and verification of their performance over the next few months before being pushed into use.The complete system will become operational after checking the systems-space (satellites), ground (ground stations) and the user end signal receivers.


The system will be similar to the Global Positioning System (GPS) operated by the United States with 24 satellites and the Glonass, Galileo and BeiDou systems of Russia, Europe and China respectively.

Prior to this 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. 

All satellites will undergo stabilisation testing and verification of their performance over the next few months before being pushed into use.The complete system will become operational after checking the systems-space (satellites), ground (ground stations) and the user end signal receivers.

The system will be similar to the Global Positioning System (GPS) operated by the United States with 24 satellites and the Glonass, Galileo and BeiDou systems of Russia, Europe and China respectively.

IRNSS System

The Indian Regional Navigation Satellite System or IRNSS is an indigenously developed Navigation Satellite System that is used to provide accurate real-time positioning and timing services over India and region extending to 1500 km around India. 


The Indian Regional Navigation Satellite System (IRNSS) consists of a constellation of seven satellites of which 3 satellites will be placed in GEO orbit and 4 satellites will be placed in GSO orbit approximately 36,000 km altitude above earth surface. 

Four Geosynchronous satellites: These 4 satellites 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: These 3 satellites will be placed in the geostationary orbit over the equator matching the Earth’s rotation. They will remain at a fixed position in the sky. 

Costing : Each satellite costs around Rs. 150 crores while the PSLV-XL version rocket costs around Rs. 130 crores. The seven rockets involves an outlay of around Rs. 910 crores.


Once fully operational, the IRNSS will provide accurate position information service 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.

  • Restricted Service (RS): It would be used for defence purposes as missile test, training and mapping.
  • Standard Positioning Service (SPS): It will be for civilian purpose and will be open for all users.

Applications of IRNSS (i) Navigation (ii) Surveying and Town/Construction Planning. (ii) Surveying and Town/Construction Planning. (iii) Disaster Management. (iv) Terrestrial navigation aid for hikers and travellers. (v) Visual and voice navigation for drivers. (vi) Vehicle tracking and fleet management.

 

 

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