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Human body vital sign signal separation method based on VMD (Variational Mode Decomposition)

A vital sign and signal separation technology, applied in the radar field, can solve problems such as noise and sampling sensitivity, lack of mathematical theory, etc., and achieve strong robustness and excellent separation effect

Active Publication Date: 2016-09-21
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Although the empirical mode decomposition EMD algorithm has greatly improved the resolution, it is very sensitive to noise and sampling, and lacks the support of mathematical theory

Method used

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  • Human body vital sign signal separation method based on VMD (Variational Mode Decomposition)
  • Human body vital sign signal separation method based on VMD (Variational Mode Decomposition)
  • Human body vital sign signal separation method based on VMD (Variational Mode Decomposition)

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Embodiment Construction

[0028] combine figure 1 , the present invention is based on the separation method of human vital signs signal of VMD, wherein figure 1 (a) is a flow chart of a single-target human vital sign signal separation method, figure 1 (b) is a flowchart of a multi-target human vital sign signal separation method. Proceed as follows:

[0029] Step 1: Perform moving target detection, range gate switching and low-pass filtering on the radar echo signal x(t) obtained by the UWB radar-based non-contact vital sign detection system to obtain the target vital sign time domain signal f(t) ;

[0030] (1.1) Moving target detection: first obtain the average value x of all slow-time sampling points in each range gate 1 , this mean x 1 is the background noise of the target environment, and then subtract the average value x from each sampling point in the same range gate corresponding to the original signal 1 The signal x containing the target motion information is obtained 1 (t);

[0031] (1...

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Abstract

The invention provides a human body vital sign signal separation method based on VMD (Variational Mode Decomposition). The human body vital sign signal separation method comprises the following steps: 1) carrying out moving target detection, range gate switching and low-pass filtering on a radar echo signal obtained by a non-contact vital sign detection system based on an ultra-wide-band radar to obtain a target vital sign signal; 2) processing the target vital sign signal obtained in step 1) by adopting a VMD algorithm, and separating a preset number of modal components; and 3) drawing a time-domain oscillogram and a spectrogram of the time-domain oscillogram for each modal component separated in step 2), and carrying out spectral analysis to obtain the required target vital sign signal. The human body vital sign signal separation method can effectively separate and extract the single-target and multi-target vital sign signals through the VMD algorithm.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a VMD-based separation method of human vital sign signals. Background technique [0002] Basic vital signs information mainly refers to breathing, heartbeat, blood pressure and body temperature, etc., especially breathing and heartbeat signals are important indicators to measure human health. At the same time, vital signs are used to judge the severity of a patient's condition and the degree of danger, and the abnormality of the parameters of the vital signs is an important cause of medical emergencies. Therefore, real-time monitoring of human body sign information is of great significance for timely treatment of patients and family medical monitoring. In the vital sign detection system of the ultra-wideband radar system, whether it is a single person's respiration, heartbeat measurement, or multi-target respiration signal detection, the most important link is the accurate separat...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16H50/50
Inventor 李彧晟季文韬唐良勇洪弘顾陈朱晓华
Owner NANJING UNIV OF SCI & TECH
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