Non-contact heart rate variability monitoring method based on frequency modulated continuous wave radar

Abstract

The invention discloses a non-contact heart rate variability monitoring method based on a frequency modulated continuous wave radar, and the method specifically comprises the steps: transmitting a periodic linear frequency modulated wave to an area where a monitored object is located, and collecting a radar echo signal; the radar echo signals are preprocessed through frequency mixing and FFT in sequence; then extracting the position of the heart part of the monitored object; adopting a phase correlation method to extract motion information of a heart part of a monitored object, and calculating an acceleration signal according to the motion information; smoothing the obtained acceleration signal, and estimating the position of a segmentation point between each heartbeat through a peak detection method; and generating an acceleration template signal of a single heartbeat, carrying out precise segmentation on the acceleration signal to obtain a heartbeat interval of each heartbeat, and calculating a heart rate variability index. According to the invention, microwaves are adopted as a detection medium, and the system has the advantages of strong anti-interference capability, strong penetrating power to non-metal obstacles, high integration level, low power consumption, high measurement precision, strong robustness and the like.

Description

technical field [0001] The invention relates to the field of high-tech transformation of traditional industries and non-contact vital sign monitoring, in particular to the design of a specific non-contact heart rate variability monitoring algorithm based on frequency-modulated continuous wave radar. Background technique [0002] In recent years, research based on non-contact physiological characteristic monitoring is in the ascendant, and various non-contact physiological characteristic monitoring methods are emerging. They are monitored in a variety of media, including infrared, acoustic and optical, to name a few. However, the non-contact physiological characteristic monitoring technologies based on the above-mentioned media all have some obvious shortcomings. For example, monitoring methods based on infrared sensors will be affected by heat sources near the monitoring object; monitoring methods based on ultrasonic sensors will be affected by air humidity and materials th...

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Problems solved by technology

[0004] In order to solve the problems of the existing non-contact physiological characteristic monitoring methods such as low measurement accuracy, limited use conditions, and susceptibility to environmental factors, and optimize the ex

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