Home - Search - Browse - Alphabetic Index: 0- 1- 2- 3- 4- 5- 6- 7- 8- 9
A- B- C- D- E- F- G- H- I- J- K- L- M- N- O- P- Q- R- S- T- U- V- W- X- Y- Z
Insat 3
Part of Insat 2 Family
Insat 3E
Insat 3E
Credit: Manufacturer Image
Indian communications satellite bus. The multipurpose satellite design provided telecommunications, television broadcasting, meteorological and search and rescue services. Communication, Meteorology satellite built by ISRO for Insat, India. Launched 2003. Used the Insat-2/-3 Bus bus.

Status: Operational 2000. First Launch: 2000-03-21. Last Launch: 2013-07-25. Number: 5 . Thrust: 400 N (90 lbf). Gross mass: 2,950 kg (6,500 lb). Unfuelled mass: 1,350 kg (2,970 lb). Height: 2.00 m (6.50 ft). Diameter: 1.77 m (5.80 ft). Span: 24.40 m (80.00 ft).

INSAT-3A carried twenty four transponders -- twelve operating in C-band frequency, six in Extended C-band and six in Ku-band. Nine of the twelve C-band transponders provided expanded geographical coverage, while the remaining three had an India coverage beam. All the extended C-band as well as the Ku-band transponders had India coverage beams. INSAT-3 also carried a Ku-band beacon.

For meteorological observation, INSAT-3A carried a three-channel Very High Resolution Radiometer (VHRR) with 2 km resolution in the visible band and 8 km resolution in thermal infrared and water vapor bands. In addition, INSAT-3A carried a Charge Coupled Device (CCD) camera which operates in the visible and short wave infrared bands providing a spatial resolution of 1 km. A Data Relay Transponder (DRT) operating in UHF band was incorporated for real-time hydro-meteorological data collection from unattended platforms located on land and river basins. The data was then relayed in extended C-band to a central location.

INSAT-3A also carried another transponder for Satellite Aided Search and Rescue (SAS & R) as part of India's contribution to the international Satellite Aided Search and Rescue program.

INSAT-3A was launched by European Ariane-5 Launch Vehicle into a Geosynchronous Transfer Orbit (GTO) with a perigee of 200 km and an apogee of 35,980 km. The satellite was maneuvered to its final orbit by firing the satellite's apogee motor. Subsequently, the deployment of solar array, antennae and the solar sail was carried out and the satellite was commissioned after in-orbit checkout.

INSAT-3A was the third satellite in the INSAT-3 series. INSAT-3B and INSAT-3C were launched in March 2000 and January 2002 respectively by the Ariane launch vehicle and both the satellites were providing regular service. INSAT-3A was to be located at 93.5 deg east longitude in the geostationary orbit.

Another two satellites, INSAT-3D and INSAT-3E were planned for launch through 2005, followed by INSAT-4 series of satellites.

Technical Specification:

  • 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 stabilized 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 had 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 vapor bands
    • Charge Coupled Device (CCD) camera operating in the visible, near infrared and shortwave infrared bands with 1 km resolution
    • Data Relay Transponder (DRT)

RCS Coarse No x Thrust: 8 x 22 N. RCS Fine No x Thrust: 8 x 10 N + Momentum/reaction wheels + Magnetic torquers. Electric System: 3.10 average kW.


More at: Insat 3.

Family: Communications, Earth, Geosynchronous orbit. Country: India. Launch Vehicles: Ariane, Ariane 42L, Ariane 5, Ariane 5G, GSLV, Ariane 5ECA, Ariane 5GS. Propellants: MON/MMH. Projects: Insat. Launch Sites: Kourou, Sriharikota, Kourou ELA2, Kourou ELA3, Sriharikota SLP. Agency: ISRO. Bibliography: 2, 552, 554, 12658, 12659.
Photo Gallery

Insat 3AInsat 3A
Credit: Manufacturer Image


Insat 3BInsat 3B
Credit: Manufacturer Image


Insat 3CInsat 3C
Credit: Manufacturer Image


Insat 3DInsat 3D
Credit: Manufacturer Image



Home - Search - Browse - Alphabetic Index: 0- 1- 2- 3- 4- 5- 6- 7- 8- 9
A- B- C- D- E- F- G- H- I- J- K- L- M- N- O- P- Q- R- S- T- U- V- W- X- Y- Z
© 1997-2017 Mark Wade - Contact
© / Conditions for Use