Method, device and radar system for detecting falling of human body by Doppler millimeter wave radar

Abstract

The invention provides a fall monitoring method based on a Doppler millimeter wave radar. The method comprises the steps of collecting a reflected signal of a monitored object by the Doppler millimeter wave radar in an activity space; according to the reflected signal, extracting the height displacement change and time change of the monitored object in the activity space to obtain the displacementd and an time interval delta t; judging whether or not the displacement d is greater than or equal to a first displacement threshold Thd1 and smaller than or equal to a second displacement thresholdThd2; if yes, judging whether or not the time interval delta t is smaller than or equal to a time threshold Tht; if yes, judging that the human body falls. According to the method, the complexity of circuit design can be reduced only by using the one-transmission and one-receiving radar without adding other auxiliary equipment, the cost is reduced, and the detection accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of information communication, in particular to a method, a device and a radar system for detecting human falls by a Doppler millimeter-wave radar. Background technique [0002] With the acceleration of the pace of life, people's life pressure is increasing, and more and more people are in a sub-health state. At the same time, as the problem of aging society becomes increasingly prominent, the health problems of more and more empty nesters, especially sudden diseases and emergencies, have received widespread attention. Therefore, how to conduct real-time monitoring of human body falls caused by sudden diseases or sudden conditions in an indoor environment has become a problem that needs to be considered in health care and the like. [0003] At present, many products have been used to detect the fall of the indoor human body through the lighting equipment embedded in the radar. The existing technical solutio...

AI Technical Summary

Problems solved by technology

[0005] 1. Judgment of human fall only by the target distance, ignoring the time information of the completion of the human fall action, the misjudgment rate is relatively high

[0006] 2. The use of other auxiliary equipment for judgment will increase the size of the module and increase the cost at the same time

[0007] 3. Using the multi-transmit and multi-receive mode will increase the complexity of the circuit and the size of the module due to the increase in the number of antennas. At the same time, the comprehensive time domain and frequency domain analysis will increase the storage capacity of the hardware, thereby increasing the cost.

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