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Satellite Communications. COE 341 Term Paper. Groupe Members. Aref Mohammad Al-Amri. Ahmad Abdulrahman Al-Gahtani. Ahmad Abdullah Al-Aloula. Topics of Presentation. Intro. Lunching. Applications. Satellites. How it works. Frequency Bands. What are Communication Satellites?.

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satellite communications

Satellite Communications

COE 341 Term Paper

groupe members
Groupe Members

Aref Mohammad Al-Amri

Ahmad Abdulrahman Al-Gahtani

Ahmad Abdullah Al-Aloula

topics of presentation
Topics of Presentation

Intro

Lunching

Applications

Satellites

How itworks

Frequency

Bands

what are communication satellites
What are Communication Satellites?
  • A satellite is an object that orbits another large object like planet.
  • A communication satellite is a staion in space that is used for telecommuncation, radio and television signals.
  • The first satellite with radio transmitter was in 1957.
geostationary orbits
Geostationary orbits
  • What are them?Geostationary orbits is fixed position to an earth-based observer.
  • When was the first use?The first truly geostationary sateliite was the SYNCOM3 in 1964.
  • Why they are important in communications?- The antennas in the ground don’t need equipment to track the satellite.- Lower cost & complixity.
  • Disadvantages?- Not always suitable for providing services at high latitudes. - Molniya satellite was introduced as a solution.
lunching satellites
Lunching Satellites
  • How does a satellite stay in it’s orbit?
frequency bands
Frequency Bands
  • Three common bands:
    • C-Band.
    • KU-Band.
    • KA-Band.
  • Most common are C-Band & KU-Band.
  • C-Band occupy 4 to 8 GHz frequency:- Low frequency.- Large antenna (2-3 meters).
  • KU-Band occupy 11 to 17 GHz:- Large frequency.- Small antenna (18-inches!)
how does a satellite work
How Does a Satellite Work?
  • Consider the light bulb example:
applications
Applications
  • Telephony- Fixed points< earth station> Satellite> earth station> fixed points.
  • Televesion & Radio- e.g. Direct broadcast satellite (DBS) & Fixed service satellite (FFS).
  • Mobile satellite technology- Special antenna called mobile satellite antenna. - No matter where or how this antenna is mounted on.
applications10
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).
disadvantages
Disadvantages
  • The antenna noise due to energy- Unwanted radiation sources (stars – galaxies - …etc). - Worsen S/N ratio.
  • Atmosphere behaves as a resistive medium- Supplies noise power to the antenna.
  • Meteors- Have to be programmed to avoid any rock or any harmful thing. - Rules of orbits.
  • Expensive- only for governments or large organizations.
in conclusion
In Conclusion

Satellites remain the best utilization used for communications due to their speed and other advantages mentioned in this presentation.

Thanks for Listening