INSAT - 3A
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Salient Features
Orbit : Geostationary (93.5 E Longitude)
Dry Mass : 1,348 kg
Mass at Lift-off : 2,950 kg
Size : Cuboid of 2.0 x 1.77 x 2.8 m with solar array on the south and solar sail & boom on the north
Length when fully deployed : 24.4 m (North-South)/ 8.5 m (East-West)
Spacecraft Propulsion : 440 N Liquid Apogee Motor with MON-3 and Control (Mixed Oxides of Nitrogen) and MMH (Mono Methyl Hydrazine) for orbit raising, 3-axis body stabilised in orbit using sensors, momentum and reaction wheels, solar flaps, magnetic torquers and
eight 10 Newton and eight 22 Newton Reaction Control Thrusters
Power : 26.6 sq.m solar array generating 3100 W, Two 70 Ah Nickel-Hydrogen batteries to support full payload operation during
eclipse period
Mission life : 12 years

Communication Payload


• 12 C-band transponders, nine of which have expanded coverage providing
an Edge-of-Coverage (EoC) Effective Isotropic Radiated Power (EIRP) of 38 dBW and three having India beam coverage providing an EoC-EIRP of 37 dBW

• 6 upper extended C-band transponders having India beam coverage providing
an EoC-EIRP of 37 dBW

• 6 Ku-band transponders having India beam coverage providing
an EoC-EIRP of 47.5 dBW

• 1 Satellite Aided Search & Rescue (SAS&R) transponder

Meteorological Payload


• Very High Resolution Radiometer (VHRR) with 2 km resolution in the visible band and 8 km resolution in infrared and water vapour bands

• Charge Coupled Device (CCD) camera operating in the visible, near infrared
and shortwave infrared bands with 1 km resolution

• Data Relay Transponder (DRT)


INSAT - 3A MISSION
Sequence of Events

INSAT-3A Ku-BAND INDIA COVERAGE POLYGON

INSAT-3A C-BAND & EXTENDED C-BAND
INDIA COVERAGE POLYGON

INSAT-3A C-BAND EXPANDED
COVERAGE POLYGON