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Classification and application of lifting tower radio stations

Time:2021-07-13 View:

The radio station is called "Radio" for short, and is equipped with stations that send and receive radio signals. From the perspective of application, it can be divided into intercom radio (such as Interphone, wireless intercom, etc.) for voice transmission and data transmission radio (such as MDS data transmission radio) for data transmission.
Radio stations are classified according to the frequency band or business scope.
1. According to the frequency band used, radio stations can be collectively referred to as long wave broadcasting station, medium wave radio station, short wave radio set (also known as high frequency radio station), super short wave radio set, microwave radio station, etc.
2. According to the classification of business scope, radio stations set on objects on the Earth's surface or within the main part of the Earth's atmosphere are collectively referred to as ground radio stations. Ground radio stations can be divided:
(1) fixed service radio stations, including: fixed radio stations, radar stations (stations), positioning radio stations and direction finding radio stations.
(2) land mobile service radio, including: base radio, mobile radio, positioning land radio, positioning mobile radio, Beacon Radio, emergency pointing Beacon Radio, rescuer radio.
(3) aviation service radio stations, including: aviation radio station, aircraft radio station, Radio altimeter radio station, aerial navigation land
Radio, aerial navigation mobile radio, Beacon Radio, instrument landing system Radio, instrument landing system locator radio, instrument landing system sliding track radio, etc.
(4) water service radio stations, including Coast Radio, ship radio, ship communication radio, Port radio, sea navigation land radio, ship positioning radio, radar beacon radio, ship emergency transmitter.
(5) broadcasting service stations, including: sound broadcasting transmitting station, television broadcasting transmitting station and broadcasting differential turntable.
(6) amateur radio.
(7) standard frequency and time signal radio.
(8) Meteorological Service radio stations, including: Space radio station, earth station, measurement and control Earth Station, base earth station, land mobile land
Ball station, coastal earth station, ship earth station, Aviation Earth Station, aircraft earth station, satellite emergency pointing Beacon station.
Solid frequency Radio
Fixed frequency radio, also called fixed frequency radio, refers to the communication carrier frequency is fixed.
Traditional radio stations belong to fixed-frequency communication, with low anti-interference ability and poor anti-interception performance, which has been severely challenged in the increasingly sharp electronic struggle. Analyzing the reasons for Iraq's defeat during the Gulf War is not unrelated to this.
Frequency hopping Radio
Frequency hopping Radio, also called frequency conversion Radio, the carrier frequency of communication is constantly hopping, low and high, unpredictable.
Frequency hopping radio station adds a code-controlled frequency hopping frequency converter on the basis of ordinary radio station. This is the "heart" of frequency hopping communication. 2. It aims to make the carrier transmitted by the transmitter a random hopping frequency sequence. The receiving system of frequency hopping communication should solve the problem of frequency hopping synchronization, so as to correctly receive the information from the sender after "dehopping. In other words, during the communication process, both parties always quickly switch to the same frequency for communication. According to the frequency hopping times in unit time, there are three kinds of frequency hopping rates: fast, medium and slow. Usually, the following 50 hops per second is called "slow jump", and the above 500 hops per second is called "fast jump". The frequency hopping rate of most military frequency hopping radio stations in the world is "medium hop".
Because the working frequency of frequency hopping radio station is hopping back and forth, its occupied frequency band is undoubtedly wider than that of ordinary radio station (generally at least ten times and hundreds of times the bandwidth of the frequency hopping radio station, even as large as thousands of times), therefore, it belongs to the category of spread spectrum communication.
Radio stations are used in various fields:
1. Civil radio and television stations with wireless;
2. Military radio telegraph, radar, radio interference, electronic warfare, etc. all adopt radio technology, and the node has a scheme;
3. There are wireless data transmission control and wireless video monitoring in the industrial site, all of which adopt the wireless radio mode, and the nodes have mature applications.