India places first weather satellite in orbit
Friday, 13 September 2002, 19:30 IST
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CHENNAI: India Thursday successfully placed in orbit its first exclusive meteorological satellite that will allow it to make more accurate weather forecasts and improve the prediction of cyclones and storms. The 1,060-kg meteorological satellite or Metsat was shot into space by the polar satellite launch vehicle (PSLV) from Sriharikota, India's satellite launch facility in Andhra Pradesh located about 100 km north of here. "The satellite is in safe orbit close to its intended position," Indian Space Research Organization (ISRO) chief K. Kasturirangan said at Sriharikota after the satellite's solar panels were deployed. "It is a wonderful moment to have achieved this very remarkable mission". Metsat was placed in a geo-synchronous transfer orbit with improved propellant technology, ISRO officials said. Unlike ISRO's INSAT satellites that carry meteorological and broadcast systems, Metsat is designed exclusively for studying the weather. It has a new lightweight antenna that transmits data from a very high-resolution radiometer and relay transponder. The antenna is made of carbon fiber reinforced plastic. The satellite is expected to provide the weather office in New Delhi with very high-resolution pictures of the slightest atmospheric disturbances and to help in predicting cyclones and storms. Future INSAT satellites from ISRO's stables will have greater freedom to devote their entire payload to communications technology without having to carry cumbersome equipment required for weather studies. Kasturirangan said this would also allow ISRO to extend the average lifespan of 10 years for an INSAT satellite by five years. This was the seventh flight of the 44-metre high PSLV, developed by ISRO and capable of putting into orbit satellites weighing up to 1,200 kg. Described by Kasturirangan as ISRO's workhorse, PSLV was initially designed to launch 900 kg remote sensing satellites. Since 1994, it has been a symbol of India's success story in space. The PSLV is designed to place satellites 900 km above the earth in polar sun synchronized orbits. The last in the PSLV series - the PSLV-C3 - was launched in October last year with three satellites -- the Technology Experimental Satellite or TES, India's first spy satellite, the German BIRD and the Belgian PROBA. Over the last eight years, the PSLV system designed by the Vikram Sarabhai Space Center in Thiruvananthapuram has been upgraded and modified several times. The PSLV's booster rockets are fired in four stages. The world's largest solid propellant boosters, carrying 138 tones of a fuel called hydroxyl-terminated polybutadiene, are used in the first stage. Six strap-on motors aid the first stage thrust. Locally built Vikas engines are used in the second stage. The rocket is given a kick by engines using 7.6 tones of fuel in the third stage and twin engines using liquid nitrogen and liquid oxygen propellants place the PSLV's payload in outer space in the fourth and final stage. An inertial navigation system guides the PSLV from launch to orbit injection stage. The solar panels of Metsat were designed to open automatically as soon as the satellite separated from the rocket, and generate 550 watts of power. The satellite has a nickel-cadmium battery to power it at times when it is in the earth's shadow. Metsat will be monitored by an ISRO tracking facility on Indonesia's Biak island. The Hassan facility in Karnataka will control the satellite. Ground stations in Canada, Italy and China will help ISRO monitor Metsat. India is an active participant in global campaigns to research the atmosphere, ISRO officials said. An Indian solar-terrestrial energy program is expected to contribute in a major way to international studies in this area. As New Delhi is an important participant in the U.N. committee on peaceful uses of outer space, India has set up a special Center for Space Science and Technology Education in Asia and the Pacific. India shares its space know-how with other developing countries under a program called SHARE
Source: IANS
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