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RSSI (received signal strength indicator) indoor positioning method introducing dynamic threshold value

An indoor positioning and dynamic threshold technology, applied in the field of radio frequency identification (RFID) communication, can solve the problem of poor positioning effect

Inactive Publication Date: 2019-03-08
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

Since the newly added virtual reference tags only cover the central part of the positioning area, the positioning effect of the points to be measured at the boundary is not as good as that at the center; in addition, the overall positioning accuracy of VIRE still has room for further improvement

Method used

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  • RSSI (received signal strength indicator) indoor positioning method introducing dynamic threshold value
  • RSSI (received signal strength indicator) indoor positioning method introducing dynamic threshold value
  • RSSI (received signal strength indicator) indoor positioning method introducing dynamic threshold value

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Embodiment Construction

[0057] The present invention provides an RSSI indoor positioning method that introduces a dynamic threshold, which is based on VIRE and combines the imaging principle of a plane mirror. First, add virtual reference labels with the same density distribution as the central area in the positioning boundary area, and then use the positioning boundary line as a mirror surface to map various reference labels within nearly half of the positioning area to the other side of the boundary line to become mirrored reference labels and mirror the virtual label, so that the boundary area indirectly becomes a "central area" surrounded by virtual labels. In order to optimize the most suitable reference tag for each tag to be tested to a greater extent, the algorithm has changed the threshold, changing the uniform threshold used when constructing the proximity map to a dynamic threshold that changes according to the tag to be tested. The simulation results show that the mirror algorithm with dy...

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Abstract

The invention discloses an RSSI (received signal strength indicator) indoor positioning method introducing a dynamic threshold value, and the method is as follows: establishing a linear regression equation with one unknown to calculate to obtain a signal intensity value of a virtual reference label in a newly added boundary region, and adding a virtual reference label with the same density distribution as a central area; then using a positioning boundary line as a mirror surface, mapping the reference label in the positioning area to the other side of the boundary line to form a mirror image reference label and a mirror image virtual label, finding the RSSI value of the reference label with the largest difference between the RSSI value of the label to be measured to obtain an absolute value of the difference between the RSSI value and the RSSI value of the label to be measured, and the unified threshold value used when the adjacent map is constructed is modified to be a dynamic threshold value which is changed according to the difference of the to-be-tested label, and then a reference label suitable for the label to be measured is screened out according to the dynamic threshold value, and the position of the label to be measured is solved according to the weight value of the reference label and the coordinates of the reference label, and the positioning of the target in the whole to-be-measured area is completed. According to the invention, the positioning precision at the boundary is improved by the newly added virtual reference label.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification (RFID) communication, and in particular relates to an RSSI indoor positioning method which introduces a dynamic threshold. Background technique [0002] Although the mature GPS (Global Positioning System) is widely used in outdoor environments, its positioning effect in indoor environments is not satisfactory, because the wireless signals emitted by satellites cannot be effectively used in indoor environments. Radio Frequency Identification (RFID) has entered the field of indoor positioning due to its many advantages such as non-contact, non-line-of-sight, low cost, large storage capacity, fast identification speed, strong anti-interference ability and good security. [0003] Among various RFID-based indoor positioning methods, it is found by comparison that the system using Received Signal Strength Indication (RSSI) for indoor positioning has the characteristics of low cost...

Claims

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Application Information

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IPC IPC(8): G01S5/02
CPCG01S5/0252
Inventor 蒋毅张若南朱慧霞李彬翟道森潘松
Owner NORTHWESTERN POLYTECHNICAL UNIV
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