ppt on Satellite radio

satellite radio tv system ppt and satellite communication basics ppt
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Dr.AldenCutts,United Kingdom,Teacher
Published Date:23-07-2017
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Satellite Radio: Its Global Impact TIFR Alumni Lecture By S.RangarajanA wonder called RADIO We will stick to the definition of Radio as • Wireless Audio Delivery •Listener cannot by himself choose the contents “No wonder so many physicists started as radio tinkers, and no wonder, before physicist became a commonplace word, so many grew up thinking they might become electrical engineers” -Gleick in the biography on Richard Feynmann 1History of Radio Technology 1888: Hertz produces EM waves 1895: Marconi transmits EM Waves 1897: Ship-to-Shore Wireless Communication 1903: First transatlantic message 1922: First Broadcast Station 1950: First FM Broadcast 1999: First Satellite Radio Broadcast 2Science of Radio “One ought to be ashamed to make use of the wonders of science embodied in a radio set, while appreciating them as little as a cow appreciates the botanic marvels in the plants she munches.” - Albert Einstein (Aug 1930) 3Satellite Orbits decided by Applications Types: LEO,GEO,HEO….. In a geostationary orbit the satellite is in the same direction in the sky all the time Such orbits ideal for Broadcasting Picks up signals from a fixed station and relays instantaneously to huge areas 4Geo-stationary Orbit Geo-stationary Orbit Application Categories: GEO an Equatorial Orbit, hence no FSS, MSS, BSS, DAB… coverage for polar regions 5Link Design Considerations AB/C Threshold, Where A is the satellite transmit characteristics, determined by state-of art satellite power, coverage area; B is Receive characteristics, determined by size and cost of the receive system; C is propagation characteristics. Majority GEO satellites (C & Ku) choose B values corresponding to DTH (1 foot antennas) or higher DAB satellites address Direct-to-Person and hence have B values 100 times lower. Hence, link margin requires A to be 100 times more. Also, DAB satellites incorporate several digital processing techniques 6DAB Satellites Spectrum L-band S-band Audio Compression MPEG AAC+ RF Design Propagation Models TDM, MCM, OFDM Examples WorldSpace XM Sirius MBSAT 7R Ra ad diio o I In nt te er rn ne et t Satellite Radio: A Confluence of Technologies Video Audio Video Audio Scalable Scalable Virtual Virtual Classroom Classroom Live Delivery Live Delivery Digital Digital Library Library Targets Select Multiple User Targets Select Multiple User Audiences Audiences Terminals Terminals 8 Satellite Satellite Digital DigitalBasic System Architecture Geo-Stationary High-powered Satellites • Processed and Transparent Payloads • Solar-Powered New Digital Portable Receivers Broadcasters • Direct Reception • Common Hub through Small • Individual VSAT-like Detachable Antenna Ground Control • Digital Quality Facilities • Proprietary Chipset • Telemetry, Command, with MPEG-2, Layer 3 and Ranging Stations Encoding • Mission Control • Multimedia Capability Provides a complete end-to-end network 9D D Terrestrial MCM Single Frequency Network LOS to Satellite elv 2 Coverage elv Center elv Repeater Coverage Region 1 3 All SFN Stations Are Equipped With A TDM/MCM Transcoder Radiated MCM Signals Synchronized Relative To Center of Coverage 10Growth of Satellite Radio in the US In the US there are two systems providing DAB: XM and Sirius Both use S-band and both have terrestrial augmentation XM has 3 GEO satellites; Sirius uses 3 HEO (Tundra orbit) satellites XM started Sep 2001 and has 5 million subscribers Sirius started July 2002 and has 2 million subscribers Both provide 100 radio channels, unique formats, commercial-free, local traffic information etc OEM partnerships with automobile industry 11WorldSpace Coverage In Service In Service 12Revival of the Radio For those on the Move (land/sea/air) For those occupied otherwise For the illiterate For kids For Teaching …… 13Audio: How it can be used Satellite Audio Uplink to Satellite Uplink Station Transmission to Audio Receivers Live/Recorded Emergency Village Preparedness Individual Classroom Content : – Locally & regionally relevant – Culturally appropriate – Practical & solution-oriented – Balanced & accurate/non-political 14Technology to aid Education 15Teaching with Audio More human and personal than Print or web Extempore Delivery and the novelty that goes with it Intonation,Phrasing & Pacing that are not easily brought out in print or on the web The Synchronous Data Channel adds a new Dimension to the delivery 16Integration with existing systems: •Pilot Experiment in west coast of India, 2000-01 •80 boats fitted with WorldSpace reception - Encased in water proof enclosure - Powered from the boat - Additional 8W amplifier - Pretuned to the assigned channel •Warning messages in MP3 format via Internet to the uplink site •Boats into the sea up to 200 miles •Valuable experience gained in designing the full systemCyclone Warning System for Fisherman out at Sea •Pilot Experiment in west coast of India, 2000-01 •80 boats fitted with WorldSpace reception - Encased in water proof enclosure - Powered from the boat - Additional 8W amplifier - Pretuned to the assigned channel •Warning messages in MP3 format via Internet to the uplink site •Boats into the sea up to 200 miles •Valuable experience gained in designing the full systemWorldSpace Reception on a Fishing Boat •Pilot Experiment in west coast of India, 2000-01 •80 boats fitted with WorldSpace reception - Encased in water proof enclosure - Powered from the boat - Additional 8W amplifier - Pretuned to the assigned channel •Warning messages in MP3 format via Internet to the uplink site •Boats into the sea up to 200 miles •Valuable experience gained in designing the full system

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