Indian regional navigational satellite system (IRNSS)-1, the first of the seven satellites of the IRNSS constellation, carries a navigation payload and a C-band ranging transponder. The spacecraft employs an optimised I-1K structure with a power handling capability of around 1660W and a lift off mass of 1425 kg, and is designed for a nominal mission life of 10 years. The first satellite of IRNSS constellation was launched onboard PSLV (C22) on 1 July 2012. While the full constellation was planned to be realised during 2014 time frame, launch of subsequent satellites got delayed.