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Passive positioning method of indoor personnel based on radio frequency tomography

A positioning method and passive technology, which can be used in the beacon system using radio waves and other directions, and can solve the problems of complex wireless signal transmission channels.

Active Publication Date: 2018-05-25
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Since indoors are different from outdoors, the environment is more complex, which makes the wireless signal transmission channel more complex, and those outdoor positioning technologies cannot be well applied to indoor positioning. Therefore, further research is needed on indoor positioning technologies.

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  • Passive positioning method of indoor personnel based on radio frequency tomography
  • Passive positioning method of indoor personnel based on radio frequency tomography
  • Passive positioning method of indoor personnel based on radio frequency tomography

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[0017] In order to further illustrate the present invention, below in conjunction with figure 1 with figure 2 Give a specific example. This example is limited to illustrate an implementation method of the present invention, and does not represent a limitation to the scope of coverage of the present invention.

[0018] Schematic diagram of UHF RFID indoor passive positioning of personnel figure 2 As shown, it is a 5m×5m positioning area, and 16 tags and four readers are placed around it. Assuming that there are M signal links in total, the positioning area is divided into N uniform pixels, and the shadow fading of all links is recorded as y, and the shadow fading of pixels is recorded as x. Since the shadow fading of each pixel is linearly added to the corresponding weight, that is, y=Wx+n, where W is the weight model and n is the additive Gaussian white noise. Obtaining y through measurement and deriving x in reverse, so as to achieve the purpose of passive positioning o...

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Abstract

The invention relates to an indoor person device-free localization method based on radio tomography imaging. According to the method, a localization region is divided into N uniform pixels, and tags and readers are arranged at the periphery of an indoor region. The method assumes that there are M communication links between the readers and the tags, the shadow fading of the communication link between each pair of reader and tag is recorded as y and the shadow fading on the pixels is recorded as x, there is a linear relationship between y and x, namely, y=Wx+n, wherein W is a weight matrix, and n is additive Gaussian white noise. A person in the localization region blocks part of the communication links, and the measured y values of the communication links fade a lot compared with the links not blocked. Based on the relationship, the shadow fading y of each communication link is assigned to the corresponding pixel according to the weight, an x fading image of each pixel is reconstructed, and the position of the pixel of which x fades most is found, which is the position of the person. The method of the invention has the advantage of strong anti-jamming capability.

Description

technical field [0001] The invention belongs to the research field of passive positioning of indoor personnel by using UHF RFID equipment, and specifically relates to radio frequency tomography technology. Background technique [0002] With the continuous development of wireless technology and mobile communication, people are more and more eager to obtain various target information in the environment at any time, any place, and in any way, and various positioning technologies have emerged, such as the well-known GPS. At present, outdoor positioning technology has developed relatively mature. Since indoors are different from outdoors, the environment is more complex, which makes the wireless signal transmission channel more complex, and those outdoor positioning technologies cannot be well applied to indoor positioning. Therefore, further research is needed on indoor positioning technologies. In recent years, indoor positioning technology has attracted the attention of many...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/08
CPCG01S1/08
Inventor 马永涛侯振寰
Owner TIANJIN UNIV
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