Earth Station

EARTH STATION

• Earth station communicates to the satellite. Any system (combination of satellite antenna, amplification, conversion, and reception electronics) that can either transmit to or receive signals from orbiting satellites.

• The ground station that receives (downlink) and sends (uplink) signals to and from communication satellites

PICTORIAL VIWE

UNITS OF EARTH STATION

• TRANSMISSION( Uplink) An uplink is the link from a ground station up to a

satellite.

• RECEPTION(Downlink) A downlink is the link from a satellite down to one or

more ground stations or receivers

UPLINK

• An uplink is a satellite antenna and transmitting system which can be used to send signals up to orbiting communications satellites.

• Uplink refers to the function of a transmission signal being sent from a ground station to a satellite.

• The signal path from an earth station to a satellite.

BLOCK DIAGRAM

UPLINK CHAIN

It comprises of Information EncoderModulatorUp converterHPA(high power amplifier)Antenna

HOW IT WORKS

1. Digital data is sent to the modulator which takes the data and converts it into a modulated signal in the IF range (70-140 MHz).

2. The IF is piped to an "up converter"which mixes the IF with a higher frequency to produce a final frequency which carries the modulated data.

3. Noise is removed from the signal via band pass filter and then amplified.

4. The final cleaned signal is transmitted down the wave guide to the dish.

5. The feed horn at the focal point of the dish emits the high frequency radio transmission, which the dish focuses into a directional transmission at the satellite.

THE DISH

• A satellite dish is just a special kind of antenna designed to focus on a specific broadcast source .

• The standard dish consists of a parabolic (bowl-shaped) surface and a central feed horn.

Types of dish

There are two types of dish:-

Transmitting dish

Receiving dish

Difference b/w transmitting and receiving dish

• Transmitting dish Receiving dish

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