Human respiratory rate calculation method based on radar measurement

A technology of respiratory frequency and calculation method, which is applied in the evaluation of respiratory organs, diagnostic recording/measurement, medical science, etc., to achieve the effect of improving accuracy, reducing requirements, and ensuring real-time performance

Active Publication Date: 2020-09-22
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ultra-wideband radar measurement of respiration is susceptible to various interferences such as human body movement and other objects in the room. Therefore, an algorithm with real-time, accuracy, and low computational complexity is needed to calculate the respiration frequency.

Method used

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  • Human respiratory rate calculation method based on radar measurement
  • Human respiratory rate calculation method based on radar measurement
  • Human respiratory rate calculation method based on radar measurement

Examples

Experimental program
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Effect test

Embodiment

[0029] In this embodiment, the subjects sit in a comfortable posture, avoid violent body movements that affect the detection, maintain normal breathing, place an ultra-wideband radar at a distance of about 1 meter from the subjects, and use the transmitter to send a message to the free space where the target body is located. Transmit electromagnetic waves, receive the echo signal reflected by the target body through the receiver, and the sampling frequency is 80Hz;

[0030] After receiving the echo signal, Fourier transform is performed on the distance dimension information of the echo signal, and then the maximum value search is performed, and the data within the preset distance centered on the maximum value is extracted to obtain the echo sequence of the human body. Such as figure 2 shown;

[0031] Next, we smooth the human body echo sequence with a window length of 80 points, and calculate the spectrum map of the smoothed human body echo sequence, as shown in image 3 Sh...

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Abstract

The invention relates to a radar signal processing technology, and discloses a human respiratory rate calculation method based on radar measurement, which can accurately calculate the respiratory ratein real time and is low in calculation complexity. The method comprises the following steps: a, receiving an echo signal reflected by transmitting an electromagnetic wave to a free space where a target human body is located by using an ultra-wideband radar; b, carrying out Fourier transform on the distance dimension information of the echo signal, then carrying out maximum value search, and extracting data within a preset distance by taking the maximum value as a center to obtain an echo sequence of a human body; c, calculating a reference respiratory rate through the spectrogram of the humanbody echo sequence; and d, calculating the average amplitude difference of the human body echo sequence, and calculating the accurate respiratory rate in combination with the reference respiratory rate.

Description

technical field [0001] The invention relates to radar signal processing technology, in particular to a method for calculating human respiratory frequency based on radar measurement. Background technique [0002] Breathing is the most basic life activity for the human body to maintain survival. Respiratory frequency contains important physiological information, and the measurement of respiratory frequency is widely used in rescue living detection, medical patient monitoring, cardiopulmonary function observation, exercise effect evaluation, sleep quality monitoring and other fields. Household products on the market can only measure heart rate and cannot detect breathing at the same time, while medical products need to wear a detection device to measure breathing, which is not very comfortable. [0003] While using non-contact measurement technology to measure respiratory rate can improve user comfort, UWB radar is a good choice. UWB radar has received more and more attention...

Claims

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Application Information

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IPC IPC(8): A61B5/05A61B5/08A61B5/00
CPCA61B5/05A61B5/0816A61B5/72A61B5/7257Y02A90/10
Inventor 张雅勤
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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