Millimeter wave radar, I believe that everyone who loves a car will not be unfamiliar. At present, cars of different price points and different grades will design one to five millimeter wave radars on the body to accurately detect the front and rear and side of the car. But you know what? Millimeter wave technology has actually been developed 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 capability, and all-weather work. Just like the 13.7-meter aperture radio telescope at the Qinghai Station of the Purple Mountain Observatory, it can carry out astronomical observation research in the frontier fields of modern astronomy and astrophysics such as molecular cloud and star formation in the Milky Way, interstellar medium physics, and is an important large-scale equipment in the field of millimeter-wave astronomical observation in China.
Of course, as I just mentioned, with the advancement of technology, small millimeter wave radars are increasingly installed on cars, with cameras and ultrasonic radars, to achieve functions similar to automatic braking, adaptive cruise, backward collision warning, blind spot monitoring and so on. This undoubtedly greatly reduces the burden on the driver, and millimeter-wave radar is indispensable.
With the advent of the era of the Internet of Everything, whole house intelligence has become the yearning of many people, and Huawei has once again given the answer to how to achieve more active intelligent services. At present, in the whole house intelligent scene, most of them use infrared human body movement sensors as mainstream perception tools. However, with the gradual diversification of users' needs for the whole house intelligent experience, simple human perception has been unable to meet the needs of consumers. Huawei's application of millimeter wave technology to human body sensors will bring accurate information input to the active intelligence of the whole house.
Compared with the traditional infrared sensor, the millimeter wave human body sensor adopts a working frequency of 76-81GHz, corresponding to a wavelength of about 1.25mm millimeter-level short-term wavelength wave, which can detect human body movements as small as a few millimeters such as turning a book and bowing the head, while the traditional infrared sensor cannot detect and perceive constant infrared radiation due to the limitation of the working principle. Therefore, in scenes such as late-night reading and toileting, the detection effect of millimeter-wave human body sensors is more accurate.
In addition to being able to accurately perceive the human body, another major advantage of millimeter-wave body sensors is that the detection range is larger. In the past, multiple infrared sensors needed to be installed, but now only one millimeter wave human body sensor is needed to achieve comprehensive coverage, reducing deployment costs and making logical judgment in the whole house intelligent scene simpler.
Traditional infrared sensors generally use active or passive infrared transmission to make signal judgments, but in some scenarios, such as when the sweeping robot at work emits infrared rays similar to the human body temperature, the sensor will mistakenly believe that the human body has entered the monitoring range, resulting in a misjudgment. The millimeter-wave human body sensor can extract the motion amplitude of different objects, optimize and learn the algorithm, effectively distinguish the external moving objects, and realize the accurate discrimination between the human body and other objects.
When going to the toilet late at night, there is no more embarrassment than suddenly turning off the lights. This embarrassment often occurs in scenarios using infrared human sensor solutions. When a person is stationary on the toilet, the infrared radiation in the area is constant, the infrared light energy on the sensor capacitance is equal and balanced, and the photocurrent cancels each other out in the loop, and the output of the signal cannot be formed. So to maintain continuous perception, you need to continuously wave to activate the sensor. If you use a millimeter-wave human body sensor that can be perceived by a few millimeters of human movement in this scene, the embarrassment will naturally be solved.
In the future, Huawei's millimeter-wave human body sensor can also obtain a more accurate human body recognition effect through upgrading, including human body position, human posture recognition and so on. If the elderly living alone fall at home, the children's mobile phones can receive alarm messages in time to avoid more accidents for the elderly due to no one to take care of them.
In addition to human posture recognition, future Huawei millimeter wave sensors can also support human position recognition. For example, when children in the home enter dangerous areas such as kitchens, storage rooms, and near power supplies, millimeter wave sensors will accurately monitor and timely alarms to protect children's safe growth.
It is believed that in the near future, millimeter wave sensor technology will be widely used in the intelligent life of the whole house, through its accurate human body sensing, reliable anti-interference ability and large-scale monitoring coverage, empowering the whole house home scene, making your home more and more "understand you", bringing you the dream life in science fiction movies.
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