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बेसिक इंग्लिश का दूसरा सत्र (कक्षा प्रारंभ : 22 अक्तूबर, शाम 3:30 से 5:30)
India Successfully Launched IRNSS-1D
Mar 31, 2015

On 28 March India took another step towards putting in place an alternative to the American GPS, putting in orbit IRNSS-1D, the fourth of the seven satellites that would form a navigation satellite network. Polar Satellite Launch Vehicle (PSLV-C27) lifted off from Satish Dhawan Space Centre, Sriharikota placed IRNSS (Indian Regional Navigation Satellite System)-1D weighing 1,425kg in a sub-geostationary orbit after a 20 minutes flight.

  • With the launch of IRNSS-1D, four active satellites will be transmitting navigation signals. This meets the minimum number of satellites required for the system to be fully functional enabling a navigation receiver to compute position.

  • It was a textbook launch as all the four stages performed as planned. The first stage of the rocket successfully separated 130 seconds after the lift-off and the second stage ignited as planned. At 262 seconds, the second stage of the rocket was burned out as planned and soon the third stage was ignited.

  • IRNSS-1D carries two payloads—a navigation payload and a ranging payload. The navigation payload will transmit navigation service signals to users, while the ranging payload the satellite has a C-band transponder which helps accurate determination of the range of the satellite. 

  • The new satellite would help a person on the ground locate his geographical position in the subcontinent.

  • IRNSS will provide positional accuracies similar to the GPS: 10 metre over the Indian landmass, 20 metre over the Indian Ocean. 

  • Basic navigational services in limited areas can be provided with four satellites in orbit now. At this stage, ISRO will use the system to test its accuracy. All seven satellites are scheduled to be in orbit by early next year, and IRNSS is scheduled to be fully operational by mid-2016.


The first three satellites in the series were launched from Sriharikota in July 2013, April 2014 and October 2014.


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