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A non-contact breathing detection method

A breathing detection and breathing frequency technology, applied in the evaluation of respiratory organs, diagnostic recording/measurement, medical science, etc., can solve problems such as phase shift of commercial WiFi, and achieve low-cost results

Active Publication Date: 2020-08-21
北京大学(天津滨海)新一代信息技术研究院
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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 (due to the blind spots of phase information or amplitude information, it is arbitrary to use both independently). A breathing detection will also produce blind spots)
Although the phase difference solves the problem of commercial WiFi phase offset to a certain extent, it still cannot avoid the problem of blind spots in the process of using a single information
Currently, no work has been done to address the blind spots encountered in breathing detection using commercial WiFi devices

Method used

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

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specific Embodiment

[0047] Such as Figure 6 Shown is a schematic diagram of the composition of the breathing detection system according to the embodiment of the present invention. Among them, (a) is the transmitting device T (which supports radio frequency signal transmission including Wi-Fi signals, and is optionally a Wi-Fi signal transmitting device); (b) is receiving device R (which supports radio frequency signal transmission including Wi-Fi signals); The radio frequency signal receiving of the Fi signal is optionally a receiving device of the Wi-Fi signal); (c) and (d) are two antennas of the receiving device R. It should be understood that in one embodiment the sending device (a) may not be part of the breath detection system. For example, the sending device may be capable of transmitting radio frequency signals (such as a router with WiFi signal transmitting function) in places where breath detection is required, which can send signals to assist the breath detection system to perform br...

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Abstract

The invention provides a non-contact breathing detection method, including the steps: receiving radio frequency signal through at least two receiving antennas; conjugating multiplication of the firstchannel state information and the second channel state information corresponding to the radio frequency signals received by any two receiving antennas to construct a third channel state information; Analyzing features in the third channel state information to determine an optimal respiration detection feature; and calculating a respiratory frequency according to the optimal respiratory detection feature. The invention utilizes the radio frequency signal transmitted by the commercial WiFi equipment to realize the detection of the target breathing frequency. The conjugate multiplication method is used to solve the phase shift problem of commercial WiFi, and the amplitude feature and phase feature are combined for respiration detection, which realizes the respiration detection of commercial WiFi without blind area. In addition, the technical proposal provided by the invention also has the advantages of non-intrusion, convenience, low cost and the like in practical application.

Description

technical field [0001] The invention relates to the field of radio communication applications, in particular to a non-contact breathing detection method, which is used for realizing non-contact 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 device and does not have any contact with the device. Compared with contact breath detection methods, non-contact breath detection has the advantages of non-invasiveness, convenience, and low cost. Based on commercial WiFi devices, which widely exist in our daily life, the technology of using commercial WiFi devices to realize non-contact breath detection has received extensive attention. [0003] Currently, a trend has emerged for respiratory monitoring based on the widely available WiFi infrastructure in the home. In 2015, Heba Abdelnasser in Egypt exploited changes in the WiFi Received...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/08
CPCA61B5/08A61B5/0816
Inventor 张大庆曾有为
Owner 北京大学(天津滨海)新一代信息技术研究院
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