SALIENT FEATURES OF IRNSS-1A

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SALIENT FEATURES OF IRNSS-1A

Mission	Navigation Satellite
Payload	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 1A located in 29⁰ inclined orbit
Mission life	>10 years
Platform	I-1K
Cuboid Size	1450 mm x 1450 mm x 1576 mm
Dry Mass	615.6 kg
Lift - off Mass	1427 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 1A launched on 1^st July 2013 onboard PSLV-C22
Present status	In-orbit