Recent trends in satellite communication


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Recent trends in satellite communication

  1. 1. By S.SURIYA PRAKASH 2011DEC086 G.VISHAL 2011DEC095
  2. 2. SATELLITE COMMUNICATION   A satellite is an object that orbits another object . The term is often used to describe an artificial satellite.  A communications satellite is an artificial satellite stationed in space for the purposes of telecommunications using radio at microwave frequencies.
  3. 3. INTRODUCTION   In 1962, the American telecommunications giant AT&T launched the world's first true communications satellite, called Telstar.  Then, countless communications satellites have been placed into earth orbit, and the technology being applied to them is forever growing in sophistication
  4. 4. FREQUENCY BAND Band Bands Download MHz 250-270 3700-4200 UHF (Military) C Band (Commercial) Ku Band 11700-21200 (Commercial) Ka Band 17,700-21200 (Commercial) Ka Band (Military) 20200-21200 Uplink Bands MHz 292-312 5925-6425 14000-14500 27500-30,000 43500-45500
  5. 5. ORBITAL PATERN   GEO: The most common type of communications satellites, particularly the broadcast satellites like AfriStar, Intelsat, PanAmSat, Eutelsat and ASTRA etc., are in geosynchronous orbit.  MEO: A medium Earth orbit (MEO) satellite is one with an orbit from a few 100 miles to a few 1000 miles above the Earth's surface.  LEO: A low Earth orbit (LEO) satellite system consists of a large number of satellites each in a circular orbit at a constant altitude between 320 and 800 km.
  6. 6. SATELLITE COMMUNICATION IN MILITARY   Military satellite communications (or milsatcom) systems are typically categorized as wideband, protected, or narrowband.
  7. 7. WIDE BAND GAPFILLER SATELLITE   The Wideband Gap filler Satellite program will produce generation of wideband communications for the Defense (DOD).
  8. 8. ADVANCED WIDE BAND SYSTEM   Defense Systems Agency and Joint Staff indicate that a global wideband satellite communications can excess of 15 megabits per second will be needed by the middle of the next decade.  The Advanced Wideband System will take advantage of the commercial and government technology advances of the first half of this decade to meet expected needs. Laser crosslinks, space- based data processing and routing systems, and highly agile multibeam/phased- array antennas will most likely be included
  9. 9. PROTECTED COMMUNICATION   Protected systems have the ability to avoid, prevent, negate, or mitigate the degradation, dis unauthorized access, or exploitation of communications services by adversaries or the environment protected systems include the Advanced Extremely High Frequency System and Advanced.
  10. 10. NARROW BAND COMMUNICTION   In the past, the term "narrowband" implied data rates of less than 64 kilobits per second, but boundary could apply in the future as higher data rates to small terminals become possible.
  11. 11. ACCELERATING CAPABILITY   In early fiscal year 2002, DOD initiated a Transformational Communications Study to accelerates delivery of advanced capabilities with state-of-the art technology to the field.
  12. 12. APPLICATIONS   Amateur radio - Access to OSCAR satellite. - Low earth orbits.  Internet - High Speed. - Useful for far away places.  Military - Uses geostationary satellites. - Example: The Defense Satellite Communications System (DSCS).
  13. 13. CONCLUTION   Future satellite communications cannot prescind from the evolution of terrestrial broadcast and broadband communication systems.  By using this the communication in military will be improved
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