Human body sensing method and system based on millimeter-wave radar

Abstract

The invention discloses a human body sensing method and system based on a millimeter-wave radar. The method comprises the following steps that: controlling a radar module to emit a radar signal, receiving an echo signal, carrying out first-time discrete Fourier transform on the echo signal to differentiate whether a motion information target is in the presence or not, and obtaining the information, including the speed, the direction and the intensity and the like, of the target from the detected motion information; carrying out second-time discrete Fourier transform on cumulative frequency domain data to distinguish whether a physiological information target is in the presence or not, obtaining whether the respiration of the target is calm or slow from the physiological information which is in the presence, combining the motion information with the physiological information to judge whether people are in the presence in the current environment or not and judge the state of the people,and forming a people state sensing method under a home environment. The method has the advantages of being simple in implementation, high in sensitivity, high in environment adaption capability, and anew method is provided for human body contact-type sensing in the fields, including smart home, security protection and the like.

Description

technical field [0001] The invention relates to the field of biological signal detection in a home environment, in particular to a human body perception method and system based on millimeter wave radar. Background technique [0002] With the rapid development of science and technology, smart home has penetrated into ordinary families. Most of the devices in the smart home sense the distribution of people around the device and then perform corresponding operations. [0003] At present, the more mainstream sensors for sensing the distribution of people around include infrared sensors, microwave sensors and electric field sensors. Infrared sensor is one of the most widely used human body sensors, which can realize high-sensitivity motion human body perception and static human body perception. The return rate is higher. Microwave sensors are based on the Doppler principle to realize the perception of moving objects, and can better distinguish the characteristics of moving hum...

AI Technical Summary

Problems solved by technology

Infrared sensor is one of the widely used human body sensors, which can realize high-sensitivity motion human body perception and static human body perception. higher return rate

Microwave sensors are based on the Doppler principle to realize the perception of moving objects, and can better distinguish the characteristics of moving human bodies, but it is difficult to distinguish stationary people, floating curtains or other objects, which may easily cause false or missed detection

The electric field sensor obtains the surrounding electric field information through the small change of the distributed capacitance to realize the perception of the human body. Due to the large dispersion of the electric field distribution of the human body, the reliability and detection distance of the electric field sensor are relatively weak

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