Method for extracting breathing state based on radar signal

Abstract

The invention discloses a method for extracting a breathing state based on a radar signal, which comprises the following steps that: 1) a radar detection module transmits a modulated continuous wave, performs one-dimensional fast Fourier transform on the received modulated continuous wave of a plurality of periods, and calculates the frequency shift of the transmitted wave; (2) when the frequency shift of the transmitted wave deviates, the influence of environmental noise is removed, and a real motion signal of the chest is extracted; (3) judging whether the test target is in a human body normal breathing state, a body moving state or an unmanned state according to the extracted waveform signal; and 4) when the human body is judged to be in the normal breathing state, calculating a breathing value according to the waveform characteristics of the breathing signal, and then judging whether the apnea phenomenon occurs in the sleep process. According to the method, the respiration signals of the testee are collected, direct contact with the human body is not needed for measurement, operation is easy and convenient, and the human body moves freely.

Description

technical field [0001] The invention relates to the technical field of respiration detection, in particular to a method for extracting a respiration state based on radar signals. Background technique [0002] The breathing state during sleep is related to human health. Apnea during sleep will cause airway obstruction and poor airflow through the nose and mouth. Long-term breathing apnea or snoring will cause serious harm to the body if not treated in time. Therefore, it is very important to monitor the breathing state during sleep. [0003] At present, the common methods of breathing state during sleep mainly include polysomnography, wrist actigraphy and sleep mattresses. Polysomnography requires simultaneous measurement of multiple physiological signals such as EEG, ECG, blood oxygen saturation, and eye movement in professional hospitals and professional instruments. During the test, the electrodes are easy to fall off, the process is complicated, and the personal freedom ...

AI Technical Summary

Problems solved by technology

Polysomnography requires simultaneous measurement of multiple physiological signals such as EEG, ECG, blood oxygen saturation, and eye movement in professional hospitals and professional instruments. During the test, the electrodes are easy to fall off, the process is complicated, and the personal freedom of the testee is limited. , also requires professional physicians to conduct data analysis, which is expensive and limited in scope of use

Wrist actigraphy needs to be worn on the limbs. Although it can measure the body movement during sleep, it cannot distinguish the breathing state.

The sleep mattress measures the breathing signal during sleep through the pressure sensor, but because the subject needs to sleep on the mattress, it will affect the sleep condition of the subject and affect the result of sleep breathing

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