2.5 Satellite Communication Flashcards Preview

As Physics Unit 1- Dr Bebb > 2.5 Satellite Communication > Flashcards

Flashcards in 2.5 Satellite Communication Deck (10)
Loading flashcards...
1
Q

What is satellite communication?

A

Satellite communication is where ground stations send and receive microwave signals to and from manmade satellites which are in orbit around the Earth.

2
Q

What is the period of a satellite?

A

The time it takes to orbit a planet.

3
Q

How does a satellite’s period change with its height above the planet?

A

If the satellite is really high above a planet’s surface then it will have a long period.

4
Q

What is a geostationary satellite?

A

A geostationary satellite is a satellite that stays above the same point above the Earth.

5
Q

How long does a geostationary satellite take to orbit the Earth?

A

24 hours

6
Q

What kind of transmitter do ground stations use to transmit to satellites?

A

Ground stations send signals to the satellite using a curved dish transmitter to transmit a strong signal.

7
Q

What is the purpose of a curved reflector on a satellite?

A

Curved reflectors on satellites boost any signals they receive.

8
Q

How high must the geostationary satellite be to achieve its orbit?

A

The satellite must be at an altitude of 36,000 km and positioned above the equator of the Earth.

9
Q

How are ground signals transmitted around the earth?

A

Ground stations send signals to the satellite using a curved dish transmitter to transmit a strong signal. At the satellite the weakened signal is collected by a curved dish receiver. It is then amplified and finally retransmitted, at a different frequency, back to the ground using another curved dish transmitter.

10
Q

What does a satellite dish consist of?

A

A reflector and dipole.