What are the important uses of radio?
1. Radio broadcasting
Radio broadcasting communication technology is a new communication technology with potential. This technology has broad development prospects. Both the information transmission efficiency and the transmission stability have surpassed the wired transmission technology.
Multiple advantages make radio broadcasting technology widely used in our country. Electromagnetic interference and signal interference of different frequencies will hinder the signal transmission of radio broadcasting, resulting in the radio broadcasting can not operate normally. It must be scientifically prevented from the actual situation.
2. Mobile communication
Mobile communication is the largest field of application of radio technology, and the development of public mobile communication in my country has maintained a strong momentum. Wireless communication occupies an extremely important position in modern communication. Wireless communication is used in almost any field, including commercial, meteorological, financial, military, industrial, and civil.
3. Satellite industry
The maturity of new technologies and the guidance of user needs have promoted the accelerated innovation and development of the satellite industry. By the end of 2018, my country had 56 synchronous orbiting satellites and 224 non-synchronous orbiting satellites, a total of 280, ranking the second in the world. The radio management organization provides effective frequency and orbit resource guarantee for the development of my country's satellite industry.
4. Navigation
Radio technology is a key element for the safe flight of aircraft. Aeronautical radio navigation provides accurate position, distance and location information for aircraft. Aviation radio communication realizes dispatching and command and ground-air communication in the airport, and aviation radio monitoring accurately determines the position and speed of aircraft. Important data.
All satellite navigation systems use satellites equipped with accurate clocks. The navigation satellite broadcasts its location and timing information. The receiver simultaneously receives signals from multiple navigation satellites. The receiver obtains its distance to each satellite by measuring the propagation time of the radio wave, and then calculates its precise position.
Loran system also uses the propagation time of radio waves for positioning, but its transmitting stations are all located on land.
VOR system is usually used for flight positioning. It uses two transmitters, one directional transmitter always emits and rotates at a fixed rate like the spotlight of a lighthouse. When the directional transmitter is facing north, another omni-directional transmitter will emit a pulse. The aircraft can receive the signals of two VOR stations, so as to determine its position by estimating the intersection of the two beams.
5. Transportation field
In the field of transportation, regardless of highway, rail or water transportation, the application of radio technology is getting deeper and deeper. In terms of highway traffic, non-stop tolling, radar traffic flow monitoring, traffic and road condition information collection, GPs navigation and positioning, etc., make cars more smooth.
In terms of rail transit, train wireless dispatch, automatic identification of train numbers, railway safety monitoring, subway operation control, etc., ensure the safe running of trains. In terms of water transportation, radio communications, radar navigation, satellite positioning, etc., are important means to improve the efficiency of ship navigation and ensure the safety of navigation waters.
6. Meteorological service
Meteorological services are also inseparable from the support of radio technology. The meteorological department uses radio waves to achieve meteorological satellite telemetry, remote sensing and information transmission.
China has built a three-dimensional integrated meteorological monitoring business system with meteorological satellites as the space base, radiosondes as the space base, and weather radar stations as the ground base, which can monitor global weather changes, climate changes, environmental changes, water resources changes And the occurrence of disasters.
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