Method for monitoring vital signs of multiple moving persons based on millimeter wave radar

A technology of millimeter-wave radar and vital signs, which is applied in the measurement of pulse rate/heart rate, diagnostic recording/measurement, medical science, etc., and can solve the inconvenience that millimeter-wave radar cannot detect human heartbeat and breathing, and the human body cannot keep still at all times And other issues

Pending Publication Date: 2021-12-31
南京六季光电技术研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the inconvenience and infection problems caused by contact detection in the prior art, realizes non-contact measurement, has high practical convenience and avoids contact infection. When in use, it can only detect the heartbeat and respiration of a stationary human body, but the human body The target cannot keep still at all times, and the movement of the human body will cause additional phase changes to the radar echo, resulting in the inability of the millimeter-wave radar to accurately detect the heartbeat and respiration of the human body

Method used

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  • Method for monitoring vital signs of multiple moving persons based on millimeter wave radar
  • Method for monitoring vital signs of multiple moving persons based on millimeter wave radar
  • Method for monitoring vital signs of multiple moving persons based on millimeter wave radar

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Effect test

Embodiment 1

[0032] Example 1: First, the millimeter wave radar transmit antenna transmits a linear frequency modified continuous wave, and the receiving antenna receives the echoes after the body reflect, and then process the intermediate frequency signal is obtained by the mixer, and then the signal is sampled to obtain the original radar data, the radar intermediate frequency signal for:

[0033]

[0034] Where T is fast, T m For slow time, the pulse interval, σ l (T m The scattering intensity of the first scatter center. T p Pulse width, f 0 Centrally, k is the FM slope, the FM band width B = KT p . Assume that the target is located at the center, the distance from the first scattering center is R l (t), corresponding echo time delay τ l (t) = 2R l (t) / c, where C is light speed and c = 3 × 10 8 M / s.

[0035] See figure 1 , A multi-person vital signs monitoring method based on millimeter wave radar,

Embodiment 2

[0036] Embodiment 2: First, the obtained radar echo is stored as a fast time-slow time format, each column represents a CHIRP sampled data; then do FFT for each column, get radar echo data from slow time format Finally, the echo of the still object reflection is finally removed by the MTD method to reduce still clutter interference.

[0037] See figure 1 , A multi-person vital signs monitoring method based on millimeter wave radar,

Embodiment 3

[0038]Example 3: Tracking multi-person action trajectories in distance-time domain, separating multiple human target trajectories, thereby obtaining single target echo, the specific steps are as follows:

[0039] (1) A peak detection is performed on the distance image corresponding to each slow time, thereby obtaining a plurality of targets at position: calculating the threshold of each slow time, comparing the amplitude in each distance gate, when returning When the value is greater than the threshold, it is judged that there is a target and retain echo data in this distance gate. If the returning amplitude value is smaller than the threshold, it will be set to the gate, repeat steps (1) to the last slow time;

[0040] (2) From step (1), a rough target path matrix DPM is obtained, assuming that the target is moving toward radar, starting from the first slow time time, the echo amplitude DPM (M, I) of each target at positions and next The time of DPM (M, I + 1) is compared, if DPM...

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Abstract

The invention discloses a method for monitoring vital signs of multiple moving persons based on a millimeter wave radar. The method comprises the following steps: transmitting linear frequency modulation continuous waves through the millimeter wave radar, detecting the multiple moving persons, receiving echoes by a receiving antenna, carrying out mixing to obtain an intermediate frequency signal, storing a radar signal in a fast time-slow time format, and performing FFT processing in the fast time direction to perform distance measurement to obtain echo data in a distance-slow time form. According to the method disclosed by the invention, the influence of human body translation on the phase is removed in the time-frequency domain through wavelet transform, the phase sequence of each target echo is extracted separately, the phase unwrapping is performed, heartbeat signals and breathing signals with different frequency bands are separated by an intermediate frequency filter, the heartbeat frequency and the breathing frequency are calculated separately through the FFT, and thus, the circumstance that the millimeter wave radar can accurately detect the heartbeat and the breathing of the human body due to the additional phase change of the radar echoes caused by the movement of the human body can be prevented.

Description

Technical field [0001] The present invention relates to the field of radar signal processing technology, and specifically a multi-human vital signs monitoring method based on millimeter wave radar. Background technique [0002] In recent years, due to the rapid development of the economy and the improvement of living standards, people have gradually increased health monitoring, and all kinds of vital signs monitoring technology came into being. At present, the extensive vital signs monitoring technology is based primarily based on sensors such as wearable devices, cameras. However, wearable devices are poor, and camera is more sensitive to light and easy to leak privacy. The advantages of all-weather and small volume, providing a possible monitoring of no contact with vital signs, which has been probably detected by millimeter-wave radar based on millimeters, and in fact, in practice, the human body is not always still stationary. The movement of the human body will produce addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0205A61B5/05A61B5/00
CPCA61B5/0205A61B5/024A61B5/02444A61B5/0816A61B5/05A61B5/725A61B5/7235
Inventor 梁景原胡文赵月
Owner 南京六季光电技术研究院有限公司
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