February 13, 1946 was the founding day of United Nations Radio. On November 3, 2011, in order to draw people's attention to the unique value of radio, UNESCO decided to designate February 13 as "World Radio Day" every year.
When it comes to radio, many people will feel a bit of mystery and strangeness, most people are "useless" about it. Radio waves are actually like air. We have been in it for a long time without realizing it. Only when something goes wrong will we realize its existence and importance. Let us open the window of radio today and explore this colorful wireless world together!
1. About Radio
1. What is radio?
The so-called radio is a technology that uses electromagnetic waves to spread and spread information in space to achieve information transmission and communication. In the space where we live, electromagnetic waves are everywhere. It can be said that the entire earth is surrounded by radio oceans.
2. What is a radio wave?
Radio waves are part of a large family of electromagnetic waves. Only electromagnetic waves with frequencies below 3000 GHz that propagate in free space without artificial waveguides are called radio waves. The shorter the wavelength of radio waves and the higher the frequency, the more information is transmitted in the same time.
3. What is the radio spectrum?
The radio waves as transmission carriers all have a certain frequency and wavelength, that is, they are located in a certain position in the radio spectrum and occupy a certain width. The radio spectrum generally refers to the general name of the radio frequency that emits radio waves in the frequency range of 9KHz-3000GHz.
In the field of mobile communications, spectrum plays a very critical role. The N41, N78, N79 and other frequency bands supported in 5G mobile phones are the radio spectrum ranges currently available to the three major domestic operators. Without a suitable frequency band, communication and downloading are impossible to talk about, and whether the frequency band resources are good enough will directly affect the performance of mobile phone calls and network transmission.
2. What has the radio brought us?
In daily life, no matter whether it is high-speed rail, security control of aircraft or code scanning, mobile payment, mobile phone signal, online shopping, etc., can not do without radio. In my country, radio services are also widely used in various industries such as radio and television, railway transportation, aerospace, scientific research, news media, and national security.
1. The radio is a kite line that humans fly into space
The role of radio waves in space is extremely significant, and all communications between the spacecraft and the ground rely on radio. If a spacecraft is like a kite, then radio communication is like a kite wire. No matter how far the spacecraft flies, and where it goes, as long as the wire is there, we can establish contact with it.
2. Radio is a bridge for people to communicate freely
The most commonly used mobile phones and mobile networks are the use of radio resources. The number of mobile communication and mobile Internet users in China ranks first in the world. The phrase "the longest distance in the world is not close to the end of the world, but disconnected from the Internet" is by no means Exaggerated, modern people can no longer do without wireless networks.
In fact, the principle of mobile phones is the same as the principle of signal transmission and reception of space probes: radio waves are generated by electromagnetic oscillations at the transmitting end, coupled to the energy of the radio waves through the antenna at the receiving end, and then converted into circuit signals for analysis and processing. .
3. Radio is the helper of people's good life
Radio and television is a traditional radio application. We can get together at home every year on New Year’s Eve to watch the Spring Festival Gala. Modern people's car life is also inseparable from radio technology, such as remote control key to open the door, parking parking with parking sensor, GPS navigation to find the line, Bluetooth car listening music and so on.
In addition, radio waves are also used for ranging and positioning, diagnosis and treatment of diseases, and even heating substances. It can be said that a person can't live without a radio from getting up in the morning to going to bed. It has penetrated into an important and inseparable part of our lives.
3. Radio in the 5G era
5G communication has the characteristics of high speed, large capacity, and low latency. With the advent of 5G communication, radio has further promoted the vigorous development of industries such as the Internet of Things, the Internet of Vehicles, smart cities, autonomous driving, and smart wearables.
1. Radio assists the Internet of Things
The Internet, which is connected with things, is an important part of the new generation of information technology. According to the agreed communication protocol, any item can be connected to the Internet for information exchange and communication. The Internet of Things further realizes information communication between people and things, and things.
To achieve a wide range of Internet of Things, wireless technology plays a vital role. Radio frequency identification (RFID) technology is a non-contact automatic identification technology that automatically identifies objects and obtains relevant data through radio frequency signals. RFID attaches electronic tags to objects to achieve efficient and flexible management of items, which is one of the most critical technologies of the Internet of Things. At the same time, the interactive transmission of information should also use wireless communication technology.
2. Dedicated frequency for IoV
As one of the typical applications of the Internet of Things, in accordance with the agreed communication protocol and data interaction standards, the Internet of Vehicles refers to a large system network for wireless communication and information exchange between vehicles and vehicles, roads, pedestrians, and the Internet. As early as 2018, the Ministry of Industry and Information Technology announced the radio-specific frequency of the Internet of Vehicles to help the development of the Internet of Vehicles. The car of the future will become a more intelligent transportation tool than the Transformers, and autonomous driving is also becoming a reality.
Radio is certainly precious, but the realization of the value of radio is inseparable from the people who are silently guarding. It is this group of people who work hard behind the communication network to support the increasingly convenient information life of modern society.