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Non-contact accurate heart rate detection method based on 77GHz millimeter wave radar

A non-contact, radar technology, applied in the field of non-contact accurate heartbeat detection, can solve problems such as main frequency estimation deviation, achieve accurate heart rate estimation, solve insufficient spectral resolution, and improve detection sensitivity.

Pending Publication Date: 2021-12-31
ZHEJIANG SCI-TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For heart rate estimation in a short time window, the frequency time phase regression technique is used to estimate the heart rate, which can significantly improve the frequency resolution, but there will be serious main frequency estimation deviation in the short time window

Method used

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  • Non-contact accurate heart rate detection method based on 77GHz millimeter wave radar
  • Non-contact accurate heart rate detection method based on 77GHz millimeter wave radar
  • Non-contact accurate heart rate detection method based on 77GHz millimeter wave radar

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Effect test

Embodiment

[0115] The sign detection experiment of the present invention is carried out in a real office environment. The reference heartbeat data of the experiment is measured by a traditional contact ECG module. The ECG electrode is attached near the subject's heart, and the sampling frequency is set to 500Hz. In addition, the experiment uses the IWR1443Boost millimeter-wave radar platform designed by Texas Instruments to measure the sign information, and its related experimental parameters are shown in Table 4. During the experiment, the subject sat quietly 0.5m in front of the radar, the chest and the radar were basically at the same level, kept breathing normally, and recorded the experimental data for two minutes.

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Abstract

The invention provides a non-contact accurate heart rate detection method based on a 77GHz millimeter wave radar. The method comprises the steps that firstly, the frequency shift caused by weak thoracic cavity displacement caused by human body heart beating is captured by adopting the continuous wave Doppler radar sign detection principle, that is, the radar transmits T (t) to a subject through a transmitting end; then the phase of a T (t) signal is modulated by the chest wall movement x (t) of the subject, and a reflected signal is captured by a radar receiving end; secondly, the reflected signal passes through a low-noise amplifier at the front end to obtain a baseband signal, the baseband signal is demodulated by adopting an orthogonal mixer, and after the baseband signal passes through a gain amplifier, a chest wall signal can be obtained through arc tangent demodulation and winding calculation; finally, a chest wall analog signal passes through an analog-digital converter to obtain a digital signal x (t), and after the digital signal is processed, a heartbeat spectrum result is obtained through a heartbeat signal extraction algorithm VMD and a heartbeat spectrum estimation algorithm CZT at a PC end.

Description

technical field [0001] The invention relates to the field of heart rate detection, in particular to a non-contact accurate heartbeat detection method based on a 77GHz millimeter radar. Background technique [0002] With the improvement of the quality of life, people pay more and more attention to life and health, and heart rate detection plays an important role in daily health monitoring and clinical medical diagnosis. On the one hand, heart rate can reflect the basic health status; on the other hand, the rhythm and intensity of heartbeat can reflect the pathological changes of internal organs to a large extent. Compared with traditional contact heartbeat monitoring, such as ECG, PPG, wristband oximeter, etc., non-contact heartbeat detection based on millimeter wave radar can realize remote monitoring, and has significant advantages in some special occasions, such as post-disaster life detection , baby monitoring, fatigue monitoring, etc. [0003] Millimeter-wave radar has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0507A61B5/024A61B5/00
CPCA61B5/024A61B5/7235A61B5/7225A61B5/0507A61B5/7203A61B5/725A61B5/7253
Inventor 邹永洋陈凯宇顾敏明雷美珍
Owner ZHEJIANG SCI-TECH UNIV
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