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A non-contact breathing detection method and device

A breath detection, non-contact technology, applied in the evaluation of respiratory organs, etc., can solve the problems of limited application, inability to effectively detect breath, etc., achieve low cost, expand the sensing range, and reduce noise

Active Publication Date: 2020-09-08
PEKING UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In 2016, Hao Wang from China introduced the concept of Fresnel zone, and revealed for the first time the principle of using WiFi CSI amplitude breath detection, pointing out that there are some blind spots in breath detection (using WiFi CSI amplitude cannot effectively detect breath)
However, the above works can only work reliably when the person is very close to the transceiver device, which limits its application in real scenarios
Reliable long-distance contactless breath detection using commercial WiFi devices (radio frequency signals (RF)) is currently not possible with existing technologies

Method used

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  • A non-contact breathing detection method and device
  • A non-contact breathing detection method and device
  • A non-contact breathing detection method and device

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Embodiment Construction

[0042] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for thorough understanding of the present disclosure, and to fully convey the scope of the present disclosure to those skilled in the art.

[0043] The present invention provides a non-contact respiration detection method. During specific implementation, the respiration rate of the target is estimated by using wireless radio frequency signals (RF) in an indoor environment based on a commercial WiFi device and when the detected target does not carry any device. . In the prior art, since the channel state information of commercial WiFi has a time-varying phase offset, it is d...

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Abstract

The invention discloses a non-contact breathing detection method and a device thereof. The method comprises the following steps: a receiving device R receives a radio frequency signal from a sending device T, and the receiving device R includes two or more receiving antennas; by aiming at the channel state information CSI corresponding to the radio frequency signals received by any two receiving antennas, a ratio of the two is taken, and a new channel state information of each subcarrier is constructed, which can eliminate phase offset and amplitude noise; an optimal breath detection characteristic of each subcarrier is determined according to new channel state information in a window of a period time; According to the optimal respiratory detection characteristics of the plurality of subcarriers, and the fusion calculation is performed to obtain the respiratory rate of a detection target. By adopting the technical scheme of the invention, a sensing range of the respiratory detection can be greatly expanded, and the method has the technical advantages of non-intrusiveness, convenience and low cost.

Description

technical field [0001] The invention relates to the technical field of radio applications, in particular to a long-distance non-contact breathing detection method and device, which realize non-contact human breathing detection through radio frequency signals. Background technique [0002] Non-contact breathing detection refers to obtaining the target's breathing rate when the target does not carry any equipment and does not have any contact with the equipment. Compared with contact breath detection methods, non-contact breath detection has the advantages of non-invasiveness, convenience, and low cost. Commercial WiFi devices are widely present in our daily life, so the realization of non-contact breathing detection technology on commercial WiFi devices has received extensive attention. [0003] Recently, we have seen a trend towards respiratory monitoring based on widely available WiFi infrastructure in the home. In 2015, Heba Abdelnasser in Egypt exploited changes in WiFi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/08
CPCA61B5/08
Inventor 张大庆曾有为
Owner PEKING UNIV
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