Home : Missions : Navigation : IRNSS - Indian Regional Navigation Satellite System : SALIENT FEATURES OF IRNSS 1B Last updated on: 30-Jun-2015


Mission Navigation Satellite
  • Navigation payload in S band and L5 band
  • CDMA ranging payload in C band
  • Rubidium Atomic Frequency Standard
Orbit / location Geo-synchronous orbit / 550 East longitude IRNSS 1B located in 290 inclined orbit
Mission life >10 years
Platform I-1K
Cuboid Size 1450 mm x 1450 mm x 1576 mm
Dry Mass 604.6 kg
Lift - off Mass 1432 kg
Power 1600 W Two sided array - each array with one panels of size 2.15 m x 1.8 m populated with multi-junction solar cells ; 1 x 80 Ah Li Ion battery
Control System Zero momentum biased system with AOCE, star sensors, sun sensors, reaction wheels (tetrahedral configuration), magnetic torquers and thrusters
Propulsion System Bipropellant system with 12 thrusters configuration - all 22N thrusters and one 440N Liquid Apogee Motor (LAM); 390 litres propellant tanks 2 nos. & 67 litre CFRP overwrap Titanium liner pressurant tank 1 no.
TTC System CCSDS Type C-band Telemetry, Tracking & Command Systems
Special Features / New Technologies
  • Atomic clock used for first time
  • Dual 1553 Bus concept
  • Corner Cube Retro Reflector for Laser Ranging
  • Dual Helix Array Antenna (dia. 1.1m) in L5 and S bands
  • Yaw flipping maneuver
  • High power 250 W TWTA in S band used for first time
Launch IRNSS 1B launched on 4th April 2014 onboard PSLV-C24
Present status In-orbit