mm wave radar , I believe everyone in your car will be familiar with it. Currently, cars of different price levels will be designed with one to five millimeter-wave radars on the body to accurately detect vehicles coming from the front, rear and side. But do you know? Millimeter wave technology has actually been developing for more than 80 years. Especially in the 1980s, millimeter-wave radar was widely used in the aerospace field.
Compared with traditional radar , millimeter wave radar has the characteristics of high tracking accuracy, strong imaging capabilities, and all-weather operation. Just like the 13.7-meter-diameter radio telescope at the Qinghai Station of the Purple Mountain Observatory, it can conduct astronomical observation research on the formation of molecular clouds and star in the Milky Way galaxy , interstellar medium physics and astronomical observation research in the cutting-edge fields of astronomy and astrophysics . It is an important large-scale equipment in China's millimeter wave astronomical observation field.
Of course, as I mentioned just now, with the advancement of technology, more and more small millimeter-wave radars have been installed on cars. In combination with cameras and ultrasonic radars, they can realize functions such as automatic brakes, adaptive cruise, backward collision warning, blind spot monitoring, etc. This undoubtedly greatly reduces the burden on the driver, and the millimeter-wave radar is indispensable.
With the advent of the era of Internet of Things, whole-house intelligence has become the yearning of many people. Faced with how to achieve more proactive intelligent services, Huawei once again gave the answer. At present, in whole-house smart scenarios, infrared human body movement sensors are mostly used as the mainstream sensing tool. However, as users' demand for whole-house smart experiences gradually diversify, simple human perception can no longer meet consumer needs. Huawei applies millimeter wave technology to human body sensors, which will bring accurate information input to the whole-house intelligence implementation of active intelligence.
Compared with the traditional infrared sensor , the millimeter-wave human body sensor uses short and long waves of millimeter order with a working frequency of 76-81GHz and a corresponding wavelength of about 1.25mm. It can detect human body movements as small as a few millimeters, such as flipping books and bowing their heads. However, due to the limitations of the working principle, traditional infrared sensors cannot detect and perceive constant infrared radiation. Therefore, in scenarios such as late-night reading and toilet use, the detection effect of millimeter-wave human body sensors is more accurate. In addition to being able to accurately sense the human body, another major advantage of millimeter wave human sensors is that they have a larger detection range. In the past, multiple infrared sensors were required to be installed, but now only one millimeter-wave human sensor is needed to achieve full coverage. While reducing deployment costs, it also makes logical judgments in whole-house smart scenarios simpler.
Traditional infrared sensors generally make signal judgments by actively or passively sending and receiving infrared rays. However, in some scenarios, such as when a sweeping robot at work emits infrared rays that are similar to the human body's body temperature, the sensor will mistakenly believe that the human body has entered the monitoring range, causing misjudgment. The millimeter-wave human body sensor can extract the movement amplitude of different objects, optimize and learn algorithms, effectively identify moving objects from outside, and achieve accurate discrimination between the human body and other objects.
When I was in the toilet late at night, the embarrassment was to turn off the lights suddenly. This embarrassment often occurs in scenarios where infrared human sensor solutions are adopted. When a person is stationary on the toilet, the infrared radiation in the area is constant, the infrared light energy on the sensor capacitor is equal and reaches equilibrium, and the photocurrent cancels each other in the circuit, making it impossible to form a signal output. So to maintain continuous perception, you need to continue to wave your hand to activate the sensor. If a millimeter-wave human body sensor that can be perceived by a few millimeters of human body movement in this scenario, the embarrassment will naturally be solved.
In the future, Huawei millimeter wave human body sensor can also achieve more accurate human body recognition effects through upgrades, including human body position, human body posture recognition, etc. If an elderly person lives alone falls at home, his children can receive the alarm message in time to avoid more accidents from the elderly due to no one taking care of him.
In addition to human posture recognition, future Huawei millimeter wave sensors can also support human position recognition.For example, when children at home walk into dangerous areas such as kitchens, storage rooms, and power supplies, the millimeter wave sensor will accurately monitor and issue an alarm in a timely manner to protect children's safe growth.
believes that in the near future, millimeter wave sensor technology will be widely used in the whole-house smart life. Through its accurate human sensing, reliable anti-interference ability and large-scale monitoring coverage, it empowers the whole-house home scenes, making your home more and more "understand you" and brings the life you dream of in science fiction movies.
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