Application of remote control lifting principle Radio

Time：2020-11-20 View：

Application

 

Radio was first used in navigation, using Morse telegraph to transmit information between ships and land. Radio has many application forms, including wireless data network, various mobile communications and radio broadcasting.

The following are the main applications of some radio technologies:

 

Broadcast
AM broadcasting can spread music and sound. Amplitude modulation technology is adopted in amplitude modulation broadcasting, that is, the higher the volume received by the microphone, the greater the energy emitted by the radio station. Such signals are susceptible to interference such as lightning or other interference sources. FM broadcasting can spread music and sound with higher fidelity than AM broadcasting. For frequency modulation, the higher the volume received at the microphone, the higher the frequency of the corresponding transmitted signal. The higher the frequency band of FM broadcasting, the larger the frequency bandwidth it has, so it can accommodate more radio stations. At the same time, the shorter the wavelength, the closer the radio propagation is to the characteristics of light wave rectilinear propagation. The sideband of FM radio can be used to spread digital signals, such as Radio signs, program profiles, websites, and stock market information.

Television
Common analog signals transmit image amplitude modulation and sound frequency modulation in the same signal. Digital TV adopts MPEG -2 image compression technology, which requires only about half of the bandwidth of analog signals.

 

Telephone
Cellular phones or mobile phones are currently the most common wireless communication mode. Cellular phone coverage is usually divided into multiple zones, each zone is covered by a base station transmitter; Usually each zone is shaped as a honeycomb hexagon, which is also the source of cellular phone name. Currently, mobile phone modes widely used include GSM, CDMA, TDMA, etc.

 

Data transmission
Digital Microwave transmission equipment and satellites usually adopt orthogonal amplitude modulation. The QAM modulation method uses both signal amplitude and phase loading information. In this way, a larger amount of data can be transferred over the same bandwidth.

 

Bluetooth
Bluetooth is a short-range wireless communication technology. It can support communication or data transmission between portable computers, mobile phones and other mobile devices.

Identification
Active or passive radio devices can be used to identify or indicate the identity of objects. RFID, namely radio frequency identification, is commonly known as electronic tags. RFID radio frequency identification is a non-contact automatic identification technology. It automatically identifies targets and obtains relevant data through radio frequency signals. The identification work can work in various harsh environments without manual intervention. RFID technology is widely used in logistics, retail, warehousing, transportation, anti-counterfeiting, security, medical and military fields.

 

Amateur radio
Amateur radio refers to radio communication in which radio enthusiasts participate. Amateur radio stations can use many open frequency bands throughout the spectrum. Many technologies used by enthusiasts, some of which later became commercial technologies, such as frequency modulation, up-side band amplitude modulation, digital packet radio and satellite signal repeater, were first applied by amateurs.

 

Navigation
Almost all satellite navigation systems use satellites equipped with precise clocks. Navigation satellites broadcast their position and timing information, and receivers receive signals from multiple navigation satellites at the same time. The receiver obtains its distance from each satellite by measuring the propagation time of the radio wave, and then calculates its exact position.

 

Radar
The distance of the target is calculated by measuring the delay of the reflected radio wave, and the surface type of the target is induced by the polarization and frequency of the reflected wave.

Heating
Microwave ovens use high-power microwaves to heat food.

 

Biological Applications
A new technology capable of wireless remote control of insects.

 

Power
Radio waves can produce weak electrostatic force and magnetic force. Under microgravity conditions, it can be used to fix objects.

 

Aerospace Power
Some schemes suggest that the pressure generated by high-intensity microwave radiation can be used as the power of interstellar detectors.

 

Astronomical Applications
The physical structure and chemical properties of celestial bodies can be studied by using the radio wave signals emitted by celestial bodies through radio telescopes. This subject is called radio astronomy.