Non-contact sensing method based on Internet of Things LoRa signal

Abstract

The invention discloses a non-contact sensing method based on an Internet of Things LoRa signal, and belongs to the field of intelligent sensing. According to the non-contact sensing method, the Internet of Things communication technology LoRa with the advantages of low power consumption and long distance is applied to non-contact long-distance sensing, through multiple antennas configured on a LoRa gateway, a method of utilizing a ratio of received signals on two antennas to eliminate phase shift caused by asynchronous receiving and transmitting and reduce noise interference is proposed, andthus the sensing range is increased. On the basis, a phase change measurement method based on a tangent vector is provided, and the phase change of a signal caused by the movement of a sensed human body can be accurately calculated. According to the non-contact sensing method, widely used Internet of Things communication facilities are fully utilized, no extra detection device needs to be installed, and indoor and outdoor non-contact sensing application can be realized in a convenient manner. The non-contact sensing method has accurate perception capability for large-scale walking and small-scale breathing detection of the human body, is easy to popularize, and is suitable for the fields of healthy smart home, smart buildings and the like.

Description

technical field [0001] The invention belongs to the field of intelligent perception, and in particular relates to a method for non-contact sensing by utilizing narrowband, low power consumption and long-distance LoRa signals in the Internet of Things. Background technique [0002] In recent years, wireless non-contact sensing technology has received extensive attention. There are related researches on the use of various wireless signals (such as WiFi, RFID, etc.), which have also spawned a variety of applications, such as: indoor positioning, behavior recognition, and breath detection. , gesture recognition, etc. Although the feasibility of the application has been preliminarily verified, the currently used wireless signals are relatively close in the sensing range. Although the communication range of WiFi is 20-50 meters indoors, its sensing range is usually 3-6 meters (F. Zhang, D. Zhang, J. Xiong, H. Wang, K. Niu, B. Jin, and Y. Wang.2018.From Fresnel diffractionmodel t...

AI Technical Summary

Problems solved by technology

[0004] In short, when the existing technology performs non-contact sensing, due to environmental noise and hardware errors, the sensing distance is small (usually within 5 meters), and long-distance sensing (more than 10 meters) cannot be achieved.

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