I. Introduction
What is radar? Radar is the abbreviation of Radio Detection and Ranging. It detects targets through radio waves and determines their location in space. Millimeter-wave radar refers to a type of radar sensor operating in the millimeter wave band. According to the "Radio Regulations" promulgated by the International Telecommunication Union (ITU), the radio frequency range of 30-300 GHz (wavelength 1-10 mm) is called the millimeter wave frequency band. The 24G radar is close to 30G, and we also call it mmw radar. Note: 24G is not sub-millimeter wave. Sub-millimeter wave refers to a frequency band with a wavelength shorter than millimeter wave and close to terahertz, such as 220GHz. Strictly speaking, 24G should be centimeter wave (λ = 1.25 cm = 12.5 mm), or sub-centimeter wave, close to the millimeter wave frequency band. In the industry, it is generally accustomed to calling it millimeter wave. Radar is a high-quality sensor using FMCW technology. In recent years, its usage in various applications has increased rapidly. Compared with PIR solutions, radar sensing is not affected by temperature, brightness, humidity or light fluctuations. It has good penetration and is very suitable for privacy-sensitive applications. Ⅱ Application Scenarios 1. Smart Mirror When the mirror senses someone, the light will turn on automatically. When people sit quietly in front of the mirror or move slightly, the light will stay on. If more functions are needed, the combination of WIFI + Bluetooth + radar module is a good solution, allowing you to know the time, temperature, weather, etc. at any time. Such smart mirrors are especially suitable for hotel or home bathrooms, dressing tables, makeup rooms, barbershops, fitting rooms, etc. If it can be combined with a breathing and heart rate detection radar, it can be further made into a medical experience product. 2. Gesture Sensing Radar: Kitchen Range Hood and Faucet When cooking, there are oil stains and water stains on the hands, which is not convenient to operate touch or button-type range hoods. If gesture sensing radar is used, the range hood can be started and closed through the air. Faucets can also be opened and closed by radar. For other human body sensing applications, such as smart toilets, pet feeders, water dispensers, air conditioners, electric fans, etc. 3.Smart Lighting Smart lighting is a relatively wide application. Through non-contact switch control, microwave sensing realizes the function of turning on the light when people come and turning off the light when people leave. Thus, it avoids the cost of double-control switches and wiring, and also reduces the user's dependence on switches. There is no need to look for the switch in the dark environment and then touch it. 4.Human Body Sensing Billboard Outdoor electronic billboards add color to the night but also bring troubles to citizens' travel. The billboards that are on all day and night have gradually changed from initially attracting attention to harming people's eyes. At night, they also cause serious light pollution and waste precious electric resources. Use sensors to detect pedestrians within the billboard range. When there are no pedestrians passing by the billboard within the sensing range, it does not work. When there are pedestrians passing by the billboard, it starts to work. Such inductive billboards can not only save energy and electricity but also improve the light pollution caused by the abuse of billboards. Outdoor advertising is possible, and indoor advertising is also possible. When someone is sensed, the advertisement will be played automatically. When there is no one, it will not be played. It is mainly used in enclosed spaces, such as elevators, taxi rear screen advertisements, etc. 5.Smart Television and Computer Screens When children are too close to the TV, an alarm will sound or the TV will be forced to standby. When no one is in front of the computer screen, it will automatically lock or hibernate to enhance enterprise information security or personal information security. 6.Smart Access Control Smart door opening and smart camera security. When sensing people, the entrance control screen wakes up for face recognition or other functions. 7.Barrier Gate Radar It is mainly used at vehicle entrances and exits of parks and companies, highway entrances and exits, and parking lot management. It replaces the existing ground induction coil and controls the lowering function of the barrier gate to prevent accidents such as "hitting cars" and "hitting people". Barrier gate radar has the advantages of convenient installation and maintenance, no need to damage the road surface, no impact on vehicle access, advanced technology, flexible setting of action distance, working all day and all weather, and being able to adapt to barrier gate poles. 8.Parking Space or Charging Pile Occupancy Detection Drivers entering large multi-story parking buildings often find it difficult to find unoccupied parking areas. In order to improve efficiency, a method is needed to inform about real-time parking conditions and guide them to unoccupied parking areas. In the field of new energy charging, 24G radar can be used to monitor the occupancy status of charging piles and detect the activities of people around to ensure the safety of the charging process. 9.Intrusion Detection and Intelligent Monitoring System 24G millimeter-wave radar can be used in intrusion detection systems in the field of security. It can monitor dynamic targets in the area in real time, such as people, vehicles, etc. Once abnormal situations are found, an alarm will be issued immediately, thus realizing effective protection of important areas. 24G millimeter-wave radar can also be combined with intelligent monitoring systems to achieve accurate tracking and identification of targets. Through the collaborative work of radar and camera, omni-directional monitoring of targets can be realized, improving the intelligent level of the monitoring system.
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