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Communication and Information Technology
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INSAT- 3B Big Leap for Net Services
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elemedicine, business and mobile satellite services are expected to get a major boost when the new INSAT-3B satellite is placed in orbit in mid-March .
Since its inception in June 1972, when the Government set up the Space Commission and Department of Space (DOS), the Indian space programme has been propelled by initiatives to develop satellites, satellite launch vehicles, sounding rockets and supported ground systems. The INSAT or the Indian satellite system programme, which began in the 1980s with the launch of four bought-up satellites from the US, has now turned indigenous. The INSAT-2 series-barring INSAT 2D-has been built indigenously.
Now the Indian space and communications industry is intently waiting for the scheduled mid-March launch of INSAT-3B. K. Kasturirangan, Chairman of Indian Space Research Organisation (ISRO), says "Telemedicine, business and mobile satellite services will move some notches further when the latest indigenous telecom satellite goes into orbit. For the first time, an INSAT will offer Ku band frequencies for the 7,500-strong VSAT networks and Internet service providers (ISPS) that drive financial and corporate sectors. "The Rs.-150 crore INSAT-3B is a purely telecom satellite and put on the fast track ahead of 3A in December 1997 after the failure of 2D. Its three transponders will almost double the available capacity for the VSAT networks.

That's not all. Even GSLV (geosynchronous satellite launch vehicle), the country's most ambitious space project, is in the final stages of development and is likely to be test-flown in June or July. It is slated to open up commercial opportunities for ISRO in the small international launch market, currently dominated by the US and European Space Agency. These achievements are bound to catapult India as an emerging power in the business of selling space.
Skyrocketing Hopes
ven otherwise, INSAT is now among the largest domestic satellite systems in Asia. Currently, there are five operational satellites in orbit with 63 transponders working. The sudden loss of INSAT 2D had curtailed VSAT operations of several private operators. It had also put brakes on the expansion plans of both the Department of Telecommunications (DOT) and Doordarshan. Being the main INSAT users, both the bodies predict a demand of nearly 120 transponders by 2002. The need for move satellites becomes more imperative with both INSAT-1D and 2A nearing their end. Already, last year's INSAT-2E is billed as India's most sophisticated indigenously-built communications satellite so far. It comes with the latest in transponder technology to beam back TV, phone and radio signals, apart from a powerful radiometer used for weather forecasting. Already, 11 of its 17 transponders have been leased out to Intelsat for the next 10 years at a fee of Rs. 42 crore per year. It is designed to last 12 years compared to seven in the case of other INSAT series satellites.
Worldwide, four major factors have fuelled the demand for satellites, the growth of the Internet, corporate business communication, value-added services and electronic commerce; mushrooming of satellite TV channels and the launch of direct-to-home (DTH) service with high-definition picture and CD-quality sound; and development of commercial remote-sensing applications and the urgent need for basic telephony in the developing countries. In this perspective, says Kasturirangan, the INSAT-3 series has many 'firsts' such as an all-India coverage on a Ku band, till now restricted to the metro cities. The 3 series can support the DTH broadcast as well as Internet access. Weighing 2.07 tonnes, the INSAT 3B will exclusively allocate transponders for the Vidya Vahini Channel for interactive training and development communication announced two years ago.
Floating Objects in the Sky
he strongest demand push, however, is coming from global mobile communications. Mobile satellite services (MSS) are set to revolutionise the landscape of mobile communications in the Indian subcontinent.
The MSS, which was first experimented on INSAT-2C will now become operational. It will provide advanced voice, data and audio services. On an experimental basis, 3B will also use its extended C capacity to introduce telemedicine to eventually give connectivity to rural areas. This will provide timely and remote diagnosis and take healthcare to villages.

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INSAT-3B is the first of the five third-generation INSAT series satellites. The total cost of the mission is under Rs 500 crore-including Rs.276 crore for the launch and Rs. 66 crore for insurance. VSATS that came in about five years ago to serve the stock markets, banking, financial and 300 corporate and public sector units, have till now been allotted seven transponders on 2B and 3C. The use of the powerful Ku frequencies will cut the size of the ground systems they would have needed for the bands. The Ku band with a bandwidth of 77/72 Mhz provides three channels. The MSS transponders are in the C/S band. The power on the Ku band will be almost three times higher at 55 W (20W on earlier satellites).

More 'Birds' in Offing
ccording to Kasturirangan the next INSAT will be launched around the year-end. Both 3A and 3C are in a "neck and neck" race and the first one to be completed will follow 3B. INSAT-3C will again be a fully telecom satellite with three Ku, 24 C and six extended C band transponders, 3A, like 2E, has a meteorology component and has been facing procurement and assembly problems. The demand for transponders is at least 30-40 more than the supply, ISRO is likely to meet the requirement by launching one or two more satellites. The projection is for about 130 transponders in the next two years. Overall, the launch of INSAT-3B satellite next month would offer the additional bandwidth that most telecom service providers have been eagerly waiting for.
Sudhir Chowdhary
Computers Today
February 2000
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