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"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.
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