Satellites

PSLV-C24 launches IRNSS-1B

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BENGALURU: ISRO's Polar Satellite Launch Vehicle, PSLV-C24 has successfully launched IRNSS-1B, the second satellite in the Indian Regional Navigation Satellite System (IRNSS) on 4 April at 1714 hours IST from Satish Dhawan Space Centre SHAR, Sriharikota.

This is the twenty fifth consecutively successful mission of PSLV. The 'XL' configuration of PSLV was used for this mission. Previously, the same configuration of the vehicle was used five times to launch Chandrayaan-1, GSAT-12, RISAT-1, IRNSS-1A and Mars Orbiter Spacecraft.



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After the lift-off with the ignition of the first stage, the important flight events, namely, stage and strap-on ignitions, heat-shield separation, stage and strap-on separations and satellite injection took place exactly as planned. After a flight of about 19 minutes, IRNSS-1B Satellite, weighing 1432 kg, was injected to an elliptical orbit of 283 km X 20,630 km, which is very close to the intended orbit.





After injection, the solar panels of IRNSS-1B were deployed automatically. ISRO's Master Control Facility (at Hassan, Karnataka) assumed the control of the satellite. In the coming days, five orbit maneuvers will be conducted from Master Control Facility to position the satellite in its Geosynchronous Circular Orbit at 55 degree east longitude.





IRNSS-1B is the second of the seven satellites constituting the space segment of the Indian Regional Navigation Satellite System. IRNSS-1A, the first satellite of the constellation, was successfully launched by PSLV on July 02, 2013.     IRNSS-1A is functioning satisfactorily from its designated geosynchronous orbital position.



Being an independent regional navigation satellite system, it is designed to provide position information in the Indian region and 1500 km around the Indian mainland. IRNSS would provide two types of services, namely, Standard Positioning Services (SPS) - provided to all users – and Restricted Services (RS), provided only to authorised users.

 



A number of ground stations responsible for the generation and transmission of navigation parameters, satellite control, satellite ranging and monitoring, etc., have been established in as many as 15 locations across the country.



Two more satellites of this constellation, namely, IRNSS-1C and IRNSS-1D, are planned to be launched in the second half of 2014.  The entire IRNSS constellation of seven satellites is planned to be completed by 2015-16.

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