"The Broader and Wider Information Road" Information Transmission PPT Courseware 4

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"The Broader and Wider Information Road" Information Transmission PPT Courseware 4

1. Microwave communication learning objectives:

1. Why use microwave communication? What are the advantages of microwave communication?

Information theory shows that the higher the _____ of electromagnetic waves as carriers, the more _____ transmitted in the same time.

Microwaves are electromagnetic waves with frequencies between _____MHz and _____MHz

Advantages: Large capacity, one microwave line can open thousands or even tens of thousands of telephone lines at the same time

2. Why build a microwave relay station? What does it do?

3. What are the disadvantages of microwave communication?

4. Can the moon serve as a relay station and why?

2. Satellite communication learning objectives:

1. What is the role of satellites?

2. If people all over the world can see a certain scene immediately, how many satellites are needed as relay stations?

3. Of the many TV programs you watch at home, which ones are delivered via satellite?

3. Optical fiber communication learning objectives:

1. Why use optical fiber communication?

Light is an electromagnetic wave with a higher frequency than microwaves, and its bandwidth is millions of times wider.

2. Why does fiber optic communication use laser?

Ordinary light sources contain many different frequencies of light, making it difficult to carry information. Laser is light with frequency _____ and direction __________.

3. What is the principle of optical fiber communication?

4. What are the advantages of fiber optic communications?

5. What is the process of optical fiber communication?

4. Network communication learning objectives:

1. How does email spread?

2. How to identify email address?

3. What are the advantages of computer networks?

1. Information theory shows that the higher the ______ of electromagnetic waves as carriers, the more ______ transmitted in the same time.

2. The operating frequency of television broadcasting is generally 30 MHz ~ 3×105MHz, and the operating frequency of sound broadcasting is generally 102 kHz ~ 30MHz. It can be seen that ______ broadcasting transmits more information than ______ broadcasting in the same time.

3. Microwaves are electromagnetic waves with frequencies between ______MHz and ______MHz. The properties of microwaves are closer to ______. They also generally propagate along ______. Microwaves ______ (optional "can" or "cannot") orbit along the surface of the earth. Therefore, a ______ must be built every ______km or so to process the incoming signals and then transmit them out to achieve long-distance communication.

4. The development of modern science and technology has enabled people to realize their dream of satellite communications. Satellite communication uses _____ as a relay station for microwave communication.

5. Evenly arranging _____ _____ satellites over the earth can cover almost the entire earth's surface, thereby achieving __________.

6. In fact, light is also an electromagnetic wave with a higher frequency than microwave, while laser is light with frequency _____ and direction __________.

7. Which of the following statements about geostationary satellites is incorrect ( )

A. The period of rotation of a geostationary satellite around the Earth is the same as the period of the Earth's rotation

B． Geostationary satellites can serve as relay stations for rebroadcasting microwaves

C. The speed of geostationary satellites is the same as the propagation speed of electromagnetic waves

D. In order for television programs from anywhere in the world to be transmitted to the whole world, at least three synchronous satellites are required

8. Which of the following descriptions about applying laser is incorrect ( )

A. Using lasers for communication B. Precise measurements over long distances using lasers

C. Using laser to process hard materials D. Using lasers for general indoor lighting

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"The Wider and Broader Information Road" Information Transmission PPT Courseware 6:

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"The Wider and Broader Information Road" Information Transmission PPT Courseware 3 Information theory shows that the higher the frequency of electromagnetic waves as carriers, the more information can be transmitted in the same time. Subject Network 1. Microwave Communication The wavelength of microwave signals is between 10 m and 1 mm; microwave signals...

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Update Time: 2024-11-04

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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