IRNSS-1B
IRNSS-1B is the second dedicated navigation satellite of India. It is one of the seven satellites constituting the IRNSS space segment. Its predecessor, IRNSS-1A, was launched by PSLV-C22 in July 2013. IRNSS-1B has a lift-off mass of 1432 kg. The configuration of IRNSS-1B is similar to that of IRNSS-1A. The satellite has been realised in less than seven months after the launch of its predecessor.
Payloads - IRNSS -1B carries two types of payloads - navigation payload and ranging payload. The navigation payload of IRNSS-1B 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-1B consists of a C-band transponder which facilitates accurate determination of the range of the satellite. IRNSS-1B also carries Corner Cube Retro Reflectors for laser ranging.
| off Mass | 1432 kg |
| Physical Dimensions | 1.58 metre x 1.50 metre x 1.50 metre |
| Orbit | Geosynchronous, at 55 deg East longitude with 29 deg inclination |
| Power | Two solar panels generating 1660 W, one lithium-ion battery of 90 Ampere-Hour capacity |
| Propulsion | 440 Newton Liquid Apogee Motor, twelve 22 Newton Thrusters |
| Control System | Zero momentum system, orientation input from Sun & star Sensors and Gyroscopes; Reaction Wheels, Magnetic Torquers and 22 Newton thrusters as actuators |
| Mission Life | 10 years |
| Launch date | Apr 04, 2014 |
| Launch site | SDSC SHAR Centre, Sriharikota, India |
| Launch vehicle | PSLV - C24 |