Vital sign detection method based on millimeter-wave radar

A detection method and technology of vital signs, applied in the directions of diagnostic recording/measurement, medical science, sensors, etc., can solve the problems of weak heartbeat signal, distinguishing breathing and heartbeat signals, and inability to accurately express the signal.

Inactive Publication Date: 2021-04-20
BEIJING UNIV OF TECH
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Problems solved by technology

However, the frequency of the heartbeat and breathing signals to be processed is relatively close, and the heartbeat signal is relatively weak. The traditional time-frequency signal analysis method cannot accurately express the change of the frequency of the signal at each time point, and even the breathing It can be distinguished from the heartbeat signal; the traditional Fourier transform needs to use a large amount of data for experiments, and the resolution of this method is relatively low

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  • Vital sign detection method based on millimeter-wave radar
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  • Vital sign detection method based on millimeter-wave radar

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Embodiment Construction

[0020] Such as figure 2 The present invention shown includes a signal acquisition module, a raw data processing module, a radar life signal acquisition module and a radar life signal processing module, and its brief steps are as follows figure 1 Shown:

[0021] S1: acquisition of the original baseband signal;

[0022] S11: The radar board used in the present invention is the AWR1642 evaluation board of Texas Instruments (TI), which is a frequency-modulated continuous wave (FMCW) radar operating at 77GHz-81GHz. Configure the radar system, adopt the antenna configuration of two transmissions and four receptions, use the transmitting antenna to transmit the modulated electromagnetic wave to the space, and then perform frequency mixing, low-pass filtering, A / D acquisition, etc. on the target echo signal received by the receiving antenna processing to obtain the original baseband signal.

[0023] S2: Perform certain preprocessing on the original baseband signal to obtain dista...

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Abstract

The invention discloses a vital sign detection method based on millimeter-wave radar, which is used for detecting heartbeat and respiratory rate of a living body. According to the method, a multi-antenna transceiving mode is adopted, distance dimension FFT is carried out on data of each receiving antenna, FFT is carried out along the dimension of each receiving antenna, and then the position of each to-be-detected target in a two-dimensional plane is determined by measuring phase change; and for an extracted target life signal, a band-pass filter is firstly used for dividing the signal into different frequency bands, then an improved empirical mode decomposition method is used for calculating respiratory and heartbeat frequencies, harmonic interference is further removed, a window local averaging method is used for replacing a cubic spline interpolation method in the empirical mode decomposition method to calculate an original signal local mean value, signal decomposition time is shortened, and the endpoint effect of an empirical mode algorithm is overcome.

Description

technical field [0001] The present invention relates to the field of radar signal detection, and more specifically, to a method for detecting vital signs based on millimeter-wave radar. Background technique [0002] Vital sign parameters are common indicators used to judge whether the life activities of the human body are normal or not, mainly including heartbeat, respiration, body temperature, blood pressure, end-tidal carbon dioxide and pulse oxygen saturation, etc. Among them, heartbeat and respiration are two parameters that are particularly important. The current method mainly adopts contact detection technology. The contact detection of biomedical signals refers to the use of electrodes or sensors to directly or indirectly contact the human body to achieve the purpose of detecting medical information. In many cases, due to the limitations of various conditions and Other considerations require remote measurements of respiration and heartbeat. The current main applicat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0205
Inventor 赛景波刘娜刘琦
Owner BEIJING UNIV OF TECH
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