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A life signal detection method and system based on fmcw millimeter wave radar

A millimeter wave radar, life signal technology, applied in the signal pattern recognition, character and pattern recognition, instruments and other directions, can solve the problem of lack of self-adaptation, can not effectively solve the heartbeat signal interference and other problems, to achieve adaptive separation Effect

Active Publication Date: 2020-10-09
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0004] Traditional radar life signal separation and extraction methods include band-pass filtering and wavelet transform, etc. Since the frequency bands of the breathing and heartbeat signals are close, the use of band-pass filters to separate breathing and heartbeat signals cannot effectively solve the problem of respiratory harmonics affecting the heartbeat signal. The wavelet transform can extract the breathing and heartbeat signals from the vital signals by selecting the appropriate wavelet basis function, but it is difficult to select the appropriate wavelet basis function, and after the basis function is determined, it cannot be done with different signals. change, not adaptive

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  • A life signal detection method and system based on fmcw millimeter wave radar
  • A life signal detection method and system based on fmcw millimeter wave radar
  • A life signal detection method and system based on fmcw millimeter wave radar

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Embodiment 1

[0049] Such as figure 2 The present invention shown comprises preprocessing module, signal extraction module and signal separation module, and its simple steps are as follows figure 1 Said:

[0050] S1: Process the radar intermediate frequency signal;

[0051] S11: Determine the position of the target from the FMCW echo signal, and extract its phase signal to obtain the distance information and phase difference signal of the target;

[0052] S12: According to the target distance information obtained by the radar, remove the interference of some objects around the target, and perform FFT on the radar intermediate frequency signal to determine the position of the target and extract the radar life signal of the target. ;

[0053]S13: Perform low-pass filtering on the radar life signal to remove high-frequency noise to obtain the life signal w(t), wherein the cutoff frequency of the low-pass filter is 3 Hz.

[0054] S2: The vital signal processed by the preprocessing module i...

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Abstract

The invention discloses a life signal detection method and system based on an FMCW millimeter wave radar, which are used to realize the detection of living bodies. By inputting the preprocessed radar life signal into the adaptive filter, the delayed radar life signal is used as a reference signal, and the delay can be adjusted in real time according to the change of the input signal, so as to realize real-time separation of breathing and heartbeat signals . The method proposed by the invention can separate breathing and heartbeat signals in real time and adaptively.

Description

technical field [0001] The present invention relates to the field of radar signal detection, and more specifically, to a method and system for detecting life signals based on FMCW millimeter wave radar. Background technique [0002] Respiration, heartbeat, body temperature, and blood pressure are commonly used indicators for judging whether the life activities of the human body are normal or not, and respiration and heartbeat are particularly important two parameters. These two important cardiopulmonary activity parameters can determine whether there is a living body, and the basic state of the living body can be obtained according to the changes of these two parameters. However, most of the existing breathing and heartbeat detection methods are contact detection methods. In many cases, due to the limitations of various conditions and the consideration of other factors, it is necessary to measure the breathing and heartbeat remotely. The life signal detection technology bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
CPCG06F2218/02G06F2218/08G06F2218/12
Inventor 刘震宇陈惠明邓雄峰陆蔚廖炫达
Owner GUANGDONG UNIV OF TECH
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