satellite services
DESCRIPTION
this ppt all about Satellite servicesTRANSCRIPT
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Project Project onon
Satellite Services Satellite Services Created by – Created by – Razi AhmedRazi Ahmed
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Satellites OverviewSatellites Overview IntroductionIntroduction History History
How Satellites WorkHow Satellites Work
Satellite Frequency Bands and AntennasSatellite Frequency Bands and Antennas
Why are Satellite ImportantWhy are Satellite Important
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What is Satellite ?What is Satellite ?An artificial body placed in orbit around the An artificial body placed in orbit around the
earth or another planet in order to collect earth or another planet in order to collect information or for communicationinformation or for communication
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History of SatellitesHistory of Satellites The First Satellites
The theory of satellites was simple enough - shoot something out into space at the right speed and on the correct trajectory and it will stay up there, orbiting Earth, for years - if not forever.
If the orbit is the right distance in space the satellite will keep pace with the rotation of the Earth.
Pioneer Satellites (1957)
Early in October 1957 communications stations started picking up a regular beeping noise coming from space.
It was January 1958, before a Jupiter rocket successfully launched Explorer 1, the first American satellite.
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Why are Satellite Important ?Why are Satellite Important ?
To Research To Research To Collect InformationTo Collect InformationTo Global Positioning To Global Positioning To Weather predictionTo Weather predictionTracingTracingControlling Controlling
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ResearchResearch
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Collect Information By Satellite Collect Information By Satellite
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Global Positioning Global Positioning
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Prediction of WeatherPrediction of Weather
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Tracing of Vehicle Tracing of Vehicle
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3 June 20083 June 2008
ControllingControlling
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How Satellites WorkHow Satellites Work1.1. A Earth Station sends A Earth Station sends
message in GHz range. message in GHz range. (Uplink) (Uplink)
2.2. Satellite Receive and Satellite Receive and retransmit signals back. retransmit signals back. (Downlink)(Downlink)
3.3. Other Earth Stations Other Earth Stations receive message in receive message in useful strength area. useful strength area. (Footprint)(Footprint)
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base stationor gateway
Satellite SystemsSatellite SystemsInter Satellite Link (ISL)
Mobile User Link (MUL) Gateway Link
(GWL)
footprint
User data
PSTNISDN GSM
GWL
MUL
PSTN: Public Switched Telephone Network
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Satellite Frequency Bands Satellite Frequency Bands and Antennas (Dishes)and Antennas (Dishes)
C-BandC-Band Ku-BandKu-Band
Most commonly used bands: Most commonly used bands: C-band C-band (4 to 8 GHz) (4 to 8 GHz) , Ku-, Ku-band band (11 to 17 GHz) , and Ka-band (20 to 30 GHz ). (11 to 17 GHz) , and Ka-band (20 to 30 GHz ).
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Resources of DataResources of Data
WikipediaWikipedia GoogleGoogle Google Image Google Image Yahoo AnswerYahoo Answer
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