IRNSS-1G


IRNSS-1G was the seventh and final of the Indian Regional Navigation Satellite System series of satellites after IRNSS-1A, IRNSS-1B, IRNSS-1C, IRNSS-1D, IRNSS-1E and IRNSS-1F. This system of satellites will provide navigational services to the Indian region. The satellite was placed in geosynchronous orbit successfully on April 28, 2016 at 12:50–pm IST.

Launch

The satellite was launched from the First Launch Pad of Satish Dhawan Space Centre, Sriharikota on board PSLV-C33. The countdown of the launch had begun 51:30 hours before at 9:20 a.m. IST on 25 April.
After the launch of IRNSS-1G the Indian government named the IRNSS system as NAVIC.

Specifications

The satellite is designed for 12 years of life. It has a lift-off mass of and dry mass of. The ranging payload of IRNSS-1G consists of a C-band transponder which facilitates accurate determination of the range of the satellite. It would operate in L-5 and S band spectrums and also has a Rubidium atomic clock. Special thermal control systems are used for key components like this clock. Two panels of solar cells are used to generate 1660W of energy and one Lithium-ion 90A-hr battery is used. The satellite is placed in an orbit at an altitude of at 129.5 deg East longitude. It cost approximately.
The "XL" version of PSLV was used with six strap-ons for the launch. Each strap-on used of propellant. ISRO has successfully used PSLV 34 times and the XL version 12 times before the launch of IRNSS-1G.