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Home >> Publications >> News letter >> July 2002 - September 2002
 
 
S P A C E    I N D I A
 
METSAT
 
METSAT is the first exclusive meteorological satellite built by ISRO. So far, meteorological services had been combined with telecommunication and television services in the INSAT system. METSAT will be a precursor to the future INSAT system that will have separate satellites for meteorology and telecommunication & broadcasting services. This will enable larger capacity to be built into INSAT satellites, both in terms of transponders and their radiated power, without the design constraints imposed by meteorological instruments.

METSAT carries a Very High Resolution Radiometer (VHRR) capable of imaging the Earth in the visible, thermal infrared and water vapour bands. It also carries a Data Relay Transponder (DRT) for collecting data from unattended meteorological platforms. METSAT will relay data sent by these platforms to the Meteorological Data Utilisation Centre at New Delhi. Such platforms have been installed all over the country. The 1060 kg METSAT was designed using a new spacecraft bus employing lightweight structural elements like Carbon Fibre Reinforced Plastic (CFRP). The satellite has a solar array generating 550 Watt of power.

METSAT was injected into orbit with a perigee (nearest point to Earth) of 218 km and an apogee (farthest point to Earth) of 34,700 km with an orbital inclination of 17.7 deg. with respect to the equator. The orbital period was 10.5 hours.

METSAT's solar array was automatically deployed immediately after its injection into Geo-synchronous Transfer Orbit (GTO) by PSLV-C4. The successful deployment of the array as well as the general health of the satellite were monitored by a ground station of the ISRO Telemetry, Tracking and Command network (ISTRAC) located in the Indonesian island of Biak.

The Master Control Facility (MCF) at Hassan in Karnataka took control of METSAT for all its post-launch operations. Ground stations at Lake Cowichan (Canada), Fucino (Italy) and Beijing (China) supported MCF in monitoring the health of the satellite and its orbit raising operations.
The orbit raising manoeuvres were started on September 13, 2002 and through three firings of the Liquid Apogee Motor (LAM) on board the METSAT for a total duration of 50 minutes 19 seconds, the satellite was placed in near geo-synchronous orbit on September 15, 2002. The spacecraft, which had 560 kg of propellant at the time of its injection into GTO, has still about 100 kg of propellant left,

Salient Features

Mission payload
:
Meteorological
Orbit
:
Geostationary
Location
:
740 E Longitude
Mass at lift-off
:
1060 kg
Dry Mass
:
498 kg
Size
:
Cuboid of Size
1475 x 1505 x 1530 (mm)
(E-W) (EV-AEV) (N-S)
Length when fully Deployed
:
3416 mm (along North-South)
Power
:
Solar array generating 550 W at End Of Life. 18 Ah Ni-Cd battery for full payload operations during eclipse
Mission Life
:
7 years
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