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Non-contact detection positioning method and system based on LoRa signals

A non-contact, positioning method technology, used in radio wave measurement systems, positioning, measuring devices, etc., can solve problems such as cost and insufficient sensing and positioning range

Active Publication Date: 2020-03-27
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a non-contact large-scale wall-penetrating sensing method based on LoRa signals, in order to solve the passive sensing and location measurement technology in the prior art Insufficient problems in terms of cost and perceived positioning range

Method used

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  • Non-contact detection positioning method and system based on LoRa signals
  • Non-contact detection positioning method and system based on LoRa signals
  • Non-contact detection positioning method and system based on LoRa signals

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Embodiment 1

[0077] This embodiment discloses a non-contact detection and positioning method based on LoRa signals, including the following steps:

[0078] Step 1: switch the receiving mode of the signal by polling to receive the signal, and obtain the first mode signal, the second mode signal and the third mode signal;

[0079] Step 2: Sampling, low-pass filtering, and amplitude processing any mode signal in the current time period to obtain the amplitude sequence A, segment A to obtain Q target windows, and then perform sequence A containing Q target windows After autocorrelation and Fourier transform, the sequence F is obtained, and the maximum peak frequency of each target window of F is selected to obtain the peak frequency set Indicates the maximum peak frequency q∈[1,Q] of the qth target window and Q is a positive integer; (the segmentation method is: the sampling point is divided into a section with a window of 1s width and a sliding window of 0.25s each time)

[0080] Step 3: ...

Embodiment 2

[0098] This embodiment discloses a non-contact detection and positioning system based on LoRa signals, including a transmitting end Tx and a receiving end Rx;

[0099] The Tx includes a LoRa node for transmitting signals to the detection area;

[0100] The Rx includes a reconfigurable antenna and a signal processor, the reconfigurable antenna is used to switch the receiving mode of the signal in a polling manner to receive the signal, and obtain the first mode signal, the second mode signal and the third mode signal, The signal processor includes a preprocessing module, a target detection module and a target positioning module;

[0101] The preprocessing module is used to obtain an amplitude sequence A by sampling, low-pass filtering, and amplitude processing the signal in any receiving mode of the current time period, segmenting A to obtain Q target windows, and then including After performing autocorrelation and Fourier transform in the sequence A of Q target windows, the s...

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Abstract

The invention relates to the field of passive sensing, and discloses a non-contact detection positioning method and system based on LoRa signals. According to the invention, signals are received through the receiving end based on a large-range through-wall detection technology amplitude processing is carried out on a signal, a maximum peak frequency is calculated through autocorrelation and Fourier transform, finally whether a moving target exists or not is judged through the maximum peak frequency, then a positioning model is established, a simultaneous equation is established, the equation is solved by using a particle swarm algorithm and a global optimal search, and finally the position of the moving target is calculated and obtained. Compared with a traditional positioning and trackingmethod, the method mainly has the advantages of being simple in system structure, easy to deploy, large in positioning range, high in precision under the condition of the same range magnitude, insensitive to the environment and multipath interference, free of machine learning in advance, suitable for unknown scenes and low in cost.

Description

technical field [0001] The invention relates to the field of passive sensing, in particular to a LoRa signal-based non-contact detection and positioning method and system. Background technique [0002] In recent years, wireless communication has developed greatly. Wireless signals are not only used for data transmission, but also used for sensing, and make new applications possible, such as indoor navigation, health care, and human-computer interaction. The passive positioning methods are mainly divided into the following three categories: [0003] The first category: Perceptual localization methods based on optics. The method mainly uses a camera to monitor the detection area, and processes and analyzes each frame of the video stream, thereby realizing real-time perception and target positioning of the target area. However, this optical-based method has high requirements for light intensity. On the other hand, non-transparent obstacles will seriously affect the working ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02
CPCG01S5/0252Y02D30/70
Inventor 陈丽丽陈凯韩典贺房鼎益陈晓江陈峰王安文徐丹
Owner NORTHWEST UNIV(CN)
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