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Satellite Services Satellite Services Created by – Created by – Razi AhmedRazi Ahmed

SatellitesSatellites

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

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

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. 

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

ResearchResearch

Collect Information By Satellite Collect Information By Satellite

Global Positioning Global Positioning

Prediction of WeatherPrediction of Weather

Tracing of Vehicle Tracing of Vehicle

3 June 20083 June 2008

ControllingControlling

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)

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

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 ).

Resources of DataResources of Data

WikipediaWikipedia GoogleGoogle Google Image Google Image Yahoo AnswerYahoo Answer