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3.3.3

Satellite Communications Systems. RECAP. How many types of mobile phone networks are there?. Mobile Phone Networks. Two types of mobile phone networks:. Cellular. Satellite . Describe how a cellular phone network operates when making calls to a landline..

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3.3.3






Presentation on theme: "3.3.3"— Presentation transcript:

Slide1

3.3.3

Satellite Communications SystemsSlide2

RECAPSlide3

How many types of mobile phone networks are there?Slide4

Mobile Phone Networks

Two types of mobile phone networks:

Cellular

Satellite Slide5

Describe how a cellular phone network operates when making calls to a landline.Slide6

Calls taking place to a landline involves the following stages:

The call is passed from the mobile device to the BST.

The BST then transfers the call to the MSC.

The MSC checks:

There is enough credit on the phone to make the call

The dialled number is valid

The MSC connects the call through the PSTN and allocates a frequency to the MS.

Cellular Phone Networks

[Calls to landlines]Slide7

What are the two main types of satellites?Slide8

Satellite Phone Networks

Satellite phones use different service providers. Access in different locations will depend on the service provider and contract and not all providers and contracts will give access in all areas.

There are two main types of satellite that the phone system uses:

Geosynchronous satellites

Low Earth Orbit satellitesSlide9

Describe how a satellite phone network works.Slide10

If a call is placed to a landline from a satellite phone then the connection must go through the PSTN.

If the call is placed to another satellite phone then the call is passed back to the satellite in space and sent down to the receiving phone.

Satellite ConnectionsSlide11

Give 3 different situations for a cellular phone use.Slide12

Mobile phones are so popular these days that the UK is almost saturated with them!

In fact...there are more mobile phones in the UK than there are people! (Approx 1.6 mobiles for every 1 person)

So how are they used?

Business calls

Contacting friends and family to organise events

Texting and picture messaging

Browsing the internet and checking emails.Smart phones also allow you to:

Listen to music and radio

Built in navigation software allows you to use your phone as a

SatNav

system.

Taking pictures and videos.

Playing games

Cellular Phone Networks

[Applications]Slide13

Give 3 different situations for a satellite phone use.Slide14

If you are in a remote place then satellite phones are the must have accessory!

The army make use of them because there aren’t many mobile phone masts out in the desert!

Natural disasters often knock out mobile phone communications but satellite phones are unaffected.

Using satellite phones also makes it difficult to ‘tap’ calls. Its why it is used by naughty people!

Satellite Connections

[Applications]Slide15

Give 3 advantages of a cellular phone network.Slide16

Advantages

Incredibly convenient!

Can be used anywhere you have a good enough signal.

Can be used in am emergency

Emergency calls can be placed on any available network.

Additional

applications can often be installed which allow you to make your phone into something more than just a device for calling and texting!Texting is great for those who have hearing disabilities!

Access to the internet is often possible wherever there is a good enough signal.

Cellular Phone Networks Slide17

Give 3 disadvantages of a satellite phone network.Slide18

Cons

The cost of these mobile phones is very expensive!

Battery life is not very good – which is an issue if you are in the middle

of the desert or up a mountain!

Requires

line of sight in order to work.

Data transfer rates are really slow(10 kbps is the norm).Latency is an issue...especially when using GEO satellites.

Satellite ConnectionsSlide19

Explain the three limitations of mobile phone networks.Slide20

Limitations

There are three big limitations of a mobile phone network:

Credit

Battery

Signal Slide21

Lesson 1Slide22

By the end of the lesson you will be able to...

Describe how satellite communications are used and work in:

Global positioning

Weather

Data transfer systems

Television

Explain the advantages and disadvantages of using satellites in a variety of applications.Slide23

What are satellites?

How does they work?Slide24

Satellites

Are equipment platforms located in space.

Each satellite has a ‘payload’ which describes its purpose.

E.g

:

A satellite fitted with radio equipment is a communication satellite

A satellite fitted with weather measuring instruments is a ‘weather satellite’.Communication satellites send and receive data from one point on the Earth to another point on the Earth.Slide25

Communication Satellites

Communication satellites

send and receive data from one point on the Earth to another point on the Earth.

The flat parts extending above the satellite are solar panel. They convert sunlight into power that is then stored in a set of on-board batteries.

The batteries allow the satellite to work on the dark side of the planet.

The spiky bits are radio antennas that communicate with Earth stations located around the world. Some antennas are dish shaped, these are designed to only cover (illuminate) certain parts of the Earth. This area is called the ‘satellite footprint’.

Satellites also contain small thruster motors. Ground control can fire these thrusters every now and then to keep the satellite in its correct orbit.Slide26

Task 1 – Satellite Applications

Use the theory button and research your given ‘satellite application’.

Complete the relevant section of the ‘Satellite PPT’.Slide27

Task 2 – Pair & Share

Share and explain your research with someone in the group paired with your group.

Complete the relevant section on the ‘Satellite PPT’.Slide28

Task 3 – Quattro

Get into groups of 4 (make sure there is one person from each group).

Help each other to complete the missing sections on the ‘Satellite PPT’.Slide29

Extension

Investigate the photos taken by satellites of the same location on Earth at different times.

How are these used to determine geographical information such as climate change?

How else might the photos be used?Slide30

Lesson 2Slide31

RECAPSlide32

What are satellites?Slide33

Satellites

Are equipment platforms located in space.

Each satellite has a ‘payload’ which describes its purpose.

E.g

:

A satellite fitted with radio equipment is a communication satellite

A satellite fitted with weather measuring instruments is a ‘weather satellite’.Communication satellites send and receive data from one point on the Earth to another point on the Earth.Slide34

Communication Satellites

Communication satellites

send and receive data from one point on the Earth to another point on the Earth.

The flat parts extending above the satellite are solar panel. They convert sunlight into power that is then stored in a set of on-board batteries.

The batteries allow the satellite to work on the dark side of the planet.

The spiky bits are radio antennas that communicate with Earth stations located around the world. Some antennas are dish shaped, these are designed to only cover (illuminate) certain parts of the Earth. This area is called the ‘satellite footprint’.

Satellites also contain small thruster motors. Ground control can fire these thrusters every now and then to keep the satellite in its correct orbit.Slide35

What are the 4 main applications satellites are used for?Slide36

Satellite Applications

Television

Weather

Global Positioning (navigation)

Data TransferSlide37

How are satellites used to transfer data?Slide38

Data Transfer

Unless the satellite is passive and does not transmit or receive data.

It is involved in some way in data transfer – photos, voice or television systems.

Satellites are also used to transfer data on the internet.Slide39

Describe the disadvantages of using a route-planning GPS system in a car.Slide40

GPS DisadvantagesSlide41

Describe how GPS works.Slide42

GPSSlide43

Describe the advantages of using satellite systems to record climate changes.Slide44

Weather AdvantagesSlide45

Describe the advantages of using a satellite to receive television signals.Slide46

Television AdvantagesSlide47

By the end of the lesson you will be able to...

Explain the advantages and disadvantages of using satellites for a variety of applications.

Describe how mobile technology and networks can enable communications from anywhere in the world.Slide48

Cross Words

Complete the crossword about SatellitesSlide49

Exam Q’sSlide50

Q 1Slide51

AnswersSlide52

Q 2Slide53

AnswersSlide54

Q 3Slide55

AnswersSlide56

Q 4Slide57

AnswersSlide58

Q 5Slide59

AnswersSlide60

Extension

Use the ‘

Mobile Technology

’ Theory to research how mobile technology and networks can enable communication from anywhere in the world.

Answer the ‘

Mobile Technology

’ Exam Q using your research.Slide61

Mark SchemeSlide62

Mark Scheme