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IRNSS-1F is the sixth navigation satellite of the seven satellites constituting
the Indian Regional Navigation Satellite System (IRNSS) space segment. Its
predecessors, IRNSS-1A, 1B, 1C, 1D and 1E were successfully launched by
PSLV-C22, PSLV-C24, PSLV-C26, PSLV-C27 and PSLV-C31 in July 2013, April 2014,
October 2014, March 2015 and January 2016 respectively. All the five satellites
are functioning satisfactorily from their designated orbital positions.
IRNSS-1F has a lift-off mass of 1425 kg. The configuration of IRNSS-1F is similar
to that of IRNSS-1A, 1B, 1C, 1D and 1E. The two solar arrays of IRNSS-1F
consisting of Ultra Triple Junction solar cells generate about 1660 Watts of
electrical power. Sun and Star sensors as well as gyroscopes provide orientation
reference for the satellite. Special thermal control schemes have been designed
and implemented for some of the critical elements such as atomic clocks. The
Attitude and Orbit Control System (AOCS) of IRNSS-1F maintains the satellite's
orientation with the help of reaction wheels, magnetic torques and thrusters.
Its propulsion system consists of a Liquid Apogee Motor (LAM) and thrusters.
IRNSS -1F carries two types of payloads – navigation payload and ranging payload.
The navigation payload of IRNSS-1F 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-1F consists of a C-band transponder, which facilitates
accurate determination of the range of the satellite. IRNSS-1F also carries
Corner Cube Retro Reflectors for laser ranging.
IRNSS-1F was launched by PSLV-C32 into a sub Geosynchronous Transfer Orbit (sub
GTO) on March 10, 2016 at 16:01 hrs (IST) from Satish Dhawan Space Centre (SDSC)
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