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Jan 20, 2016
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Polar Satellite Launch Vehicle, in its
flight (PSLV-C31), launches IRNSS-1E, the fifth
satellite of the Indian Regional Navigation Satellite System (IRNSS).
The launch took place from the Second Launch Pad (SLP) of Satish Dhawan
Space Centre (SDSC) SHAR, Sriharikota on January 20, 2016 at 09:31
Hrs (IST). As in the previous four launches of IRNSS satellites,
PSLV-C31 used ‘XL’ version of PSLV. This is the eleventh time ‘XL’
configuration is being flown, earlier ten being PSLV-C11/Chandrayaan-1,
PSLV-C17/GSAT-12, PSLV-C19/RISAT-1, PSLV-C22/IRNSS-1A, PSLV-C25/Mars
Orbiter Spacecraft, PSLV-C24/IRNSS-1B, PSLV-C26/IRNSS-1C,
PSLV-C27/IRNSS-1D, PSLV-C28/DMC-3 and PSLV-C30/ASTROSAT missions.
IRNSS-1E with a lift-off mass of 1425
kg, is the fifth navigation satellite of the seven satellites
constituting the IRNSS space segment. Its predecessors, IRNSS-1A, 1B, 1C
and 1D were launched by PSLV-C22, PSLV-C24, PSLV-C26 and PSLV-C27 in
July 2013, April 2014, October 2014 and March 2015 respectively. The
configuration of IRNSS-1E is similar to that of IRNSS-1A, 1B, 1C and
IRNSS -1E carries two types of payloads – navigation
payload and ranging payload. The navigation payload of IRNSS-1E
transmits navigation service signals to the users. This payload
is operating in L5-band and S-band. A highly accurate Rubidium
atomic clock is part of the navigation payload of the satellite. The
ranging payload of IRNSS-1E consists of a C-band transponder which
facilitates accurate determination of the range of the satellite.
IRNSS-1E also carries Corner Cube Retro Reflectors for laser ranging.