"Modern Communications" Electromagnetic Wave PPT Courseware 2

Description

"Modern Communications" Electromagnetic Wave PPT Courseware 2

Information theory states:

As the carrier of electromagnetic waves, the higher the frequency, the more information can be transmitted in the same time. To put it figuratively, "the information highway is getting wider and wider."

Microwave communication

The wavelength of microwave signals is between 10 m and 1 mm;

The frequency of microwave signals is between 30 MHz and 3 × 105 MHz.

Question: Can the moon be used as a relay station to achieve microwave communication?

Answer: Too far and inconvenient

Solution: Satellite Communications

Satellite Communications

Most communication satellites are "stationary" relative to the earth - synchronous satellites

It is essentially a microwave relay station stationary in space.

Four major satellite navigation systems:

United States-GPS global positioning system;

Russia-GLONASS system;

Euro-Galileo System;

China-Beidou satellite navigation system.

Optical Fiber Communication

Light is an electromagnetic wave with a much higher frequency than microwaves.

The "highway" of optical communications is wider.

The use of lasers with a single frequency and highly concentrated direction for communication works very well.

Telecommunication

Computers can process various information at high speeds, and can connect computers together to enable network communication. The most frequent form of online communication is email.

Computers can be connected to each other to form local area networks, and these networks are connected to each other to form the Internet, the largest network in the world.

In addition to metal wires, optical cables, communication satellites, etc. can also be used to connect computers.

Keywords: electromagnetic wave teaching courseware, modern communication teaching courseware, Lujiao version ninth grade physics PPT courseware download, second volume, ninth grade physics slide courseware download, electromagnetic wave PPT courseware download, modern communication PPT courseware download, .PPT format;

For more information about the "Electromagnetic Wave Modern Communication" PPT courseware, please click the "Electromagnetic Wave ppt Modern Communication ppt" tag.

"Modern Communications" Electromagnetic Wave PPT courseware:

"Modern Communications" Electromagnetic Wave PPT Courseware Learning Objectives: Understand satellite communications, optical fiber communications, and network communications with common sense. Read P42-45 carefully and complete the following questions. (Time 5 minutes) As the carrier of radio waves, the higher the frequency, the more information transmitted in the same time...

How to transmit information in "Modern Communication Technology and Development Prospects" - Introduction to Communication Technology PPT Courseware 3:

"Modern Communication Technology and Development Prospects" How to Deliver Information and Communication Technology Introduction PPT Courseware 3 Microwave Communication Advantages: Large capacity, one microwave line can open thousands or even tens of thousands of telephone lines Disadvantages: Relay stations must be built every 50km, signal degradation, time Delay..

How to transmit information in "Modern Communication Technology and Development Prospects" - Introduction to Communication Technology PPT Courseware 2:

"Modern Communications Technology and Development Prospects" How to Deliver Introduction to Information and Communications Technology PPT Courseware 2 Teaching Objectives: Knowledge and Abilities Understand the basic situation of mobile communications, network communications, optical fiber communications, and satellite communications. Process and Methods By reading relevant information and teachers..

File Info

Update Time: 2024-09-08

This template belongs to Physics courseware Lu Jiao Edition Ninth Grade Physics Volume 2 industry PPT template

Preview