Course :- Burning Issues Decoded (BID) Lesson :- ISRO GSAT 11 Presented By Nithin Kunneparambil
Context . India's newest and heaviest satellite GSAT 11 has been launched from French Guiana.
Where is French Guiana? French Guiana is in South Americoa VENEZUELA FRENCH GUIANA COL . It is a territory of France . Nothing great, but has BRAZIL Guiana space in 1965 nly territory of the mainland Americas that is still part of a European country Has borders with Suriname and Brazil BOL PARAGUAY CHILE Atlantic Ocean RUGUAY Pacific Ocean
So, what is special about GSAT 11 It is called as the Big Bird. It is the heaviest (5854 Kgs) and the most advanced communication satellite . Next generation High Throughput communication satellite. Provides high data rate connectivity to Indian Mainland and Islands using Ka Band and Ku Band. This will have 40 transponders (32 in Ku Band and 8 in Ka Band) Cost was 1200 Crores Expected to work 15 years.
What is this Ka Band and KU Band? tandard Radar Frequency Letter-Band Nomenclature(IEEE Standard 521-2002) . The idea emanates from Band Designator Frequency (GHz) Wavelength in Free Space Radio Frequency Spectrum and the classification the bands. HF VHF UHF L band S band C band X band Ku band K band Ka band V band W band 0.003 to 0.030 0.030 to 0.300 0.300 to1 1 to 2 2 to 4 4 to 8 8 to 12 12 to 18 18 to 27 27 to 40 40 to 75 75 to 110 (centimeters) 10000 to 1000 1000 to 100 100 to 30.0 30.0 to 15.0 15 to 7.5 7.5 to 3.8 3.8 to 2.5 2.5 to 1.7 1.7 to 1.1 1.1 to 0.75 0.75 to 0.40 0.40 to 0.27
Other details . Right now it is placed in the Transfer orbit which is elliptical 36,000Km. . Later, the fuel will be fired and increase the velocity and make sure that it goes higher to a geostationary circular orbit This means that the rotation takes 24 hours, hence seen from the earth the satellite appears stationary. Henceforth the name . Afterwards, Power systems will be turned on, Antenna will be deployed.
What makes it special. It aims to connect the unconnected places in our country like hills, forests, islands. Normally these are done through optical fibre networks where the speed is in Tera bytes. Speed is not the biggest criteria here even though the speed could comes uptill 16 GBps. Now let us discuss the idea of Multi Beam Spot Beam antenna.
Radiation Pattern of an Antenna 90 120 60 0 (degrees) 3 dB beam width 150 30 180 30 20-10 0 gain (dBi) 210 330 240 300 270 9 dBi gain
How do we give I N DIA Pol itical M a p AFGHANISTAN of this map are not verified or authenticated ord 00dd be wrong. The mop is for guidance only Inel. Boundary State Boundary _ Country Cop001 NEw Dou. QUJARAT Major Centre Cuttock CHINA . The idea of multiple PAKISTAN TIBET NEW DELHIMectut foot prints, so that NEP AarLCKNOW Dorjeeling 2 BHUTA communications happen in those region. ANGLA ENGAL&DE MYANMAR Sambolpur Digho mechanism for beam stearing BAY OF BENGAL CudapohNellore . Hence it is a beautiful concept Hence we can give last mile connectivity. SRI LANKA OCEAN
Why launch it from French Guiana? . The idea of French Guiana is quite crucial because, our work horse, i.e. Our launch vehicle is GSLV Mk III two solid strap-ons, a core liquid booster and a cryogenic upper stage. This can 4000 Kgs to GTO and 18000 Kg to LEO But this satellite weighs much more. R INDIA . Hence, we had to launch it from theirs. So, should we built a rocket more powerful