INDIAN SPACE RESEARCH SATELLITES
INSAT 4B
INSAT–4B Spacecraft is the second in the INSAT 4 series of spacecrafts and is configured with exclusive communication payloads to provide services in Ku and C frequency bands. This is co-located with INSAT–3A at 93.5 o E longitude.
| Mission | Communication |
| Weight | 3025 Kg (at Lift – off) |
| Onboard Power | 5859 W |
| Stabilization |
It uses 3 earth sensors, 2 digital sun sensors, 8 coarse
analog sun sensors, 3 solar panel sun sensors and one sensor processing
electronics. The wheels and wheel drive electronics were imported with
indigenous wheel interface module to interface the wheel drive electronics and
AOCE.
|
| Propulsion |
The propulsion system is employing 16 thrusters, 4 each
located on east, west and AY sides and 2 each on north and south sides. There
is one 440 N liquid apogee motor (using Mono Methyl Hydrazine (MMH) as fuel and
oxides of Nitrogen ( MON3 as oxidizer) and three presurant tanks mounted on the
LAM deck.
|
| Payload | 12 Ku band high power transponders covering
Indian main land using 140W radiatively cooled TWTAs.
|
| 12 C band high power transponders with extended coverage, covering southeast and northwest region apart from Indian main land using 63 W TWTAs | |
| Launch date | March 12, 2007 |
| Launch Site | French Guyana |
| Launch Vehicle | Ariane5 |
| Orbit | Geostationary (93.5o E Longitude) |
| Mission Life | 12 Years |