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Improved UHF-RFID positioning method

A technology of UHF-RFID and positioning method, which is applied in the direction of positioning, measuring devices, instruments, etc., can solve the problems of small application field and high cost of AOA positioning method, achieve fast reading speed, reduce multipath effect and noise interference, power low loss effect

Inactive Publication Date: 2019-01-22
HEBEI AGRICULTURAL UNIV.
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The cost of AOA positioning method is high, and the application field is small

Method used

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  • Improved UHF-RFID positioning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] refer to Figure 1-2 , a specific embodiment of the present invention includes the following steps,

[0040] A. Set up several RFID reader antennas and reference tags in the measurement area;

[0041] B. Use the RFID reader antenna to measure the RSSI value of each reference tag, and calculate the power-distance model;

[0042] C. Use the RFID reader antenna to measure the RSSI value of the tag to be tested, and obtain the position of the tag to be tested through the power-distance model.

[0043] In step B, the step of calculating the power-distance model is,

[0044] Let the transmitting power of the reader antenna be P R , the transmit gain is G R , when the distance between the antenna and the tag is d, the received power P is

[0045]

[0046] Then the power density S at the antenna B for:

[0047]

[0048] Where σ is the power transfer coefficient, which is only related to the physical characteristics of the tag.

[0049] Let the antenna receiving ga...

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PUM

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Abstract

The invention discloses an improved UHF-RFID positioning method. The method comprises the following steps that A, a plurality of RFID reader-writer antennas and reference labels are arranged in a measuring area; B, the RSSI values of all the reference labels are measured by using the RFID reader-writer antennas, and a power-distance model is calculated; and C, the RFID reader-writer antennas are used for measuring the RSSI values of the to-be-measured labels, and the positions of the to-be-measured labels are obtained through the power-distance model. According to the method, the deficienciesin the prior art can be improved; the reading speed is high; the power loss is small; and the anti-interference capability is relatively strong.

Description

technical field [0001] The invention relates to the technical field of wireless positioning, in particular to an improved UHF-RFID positioning method. Background technique [0002] With the development of Internet of Things technology, people have put forward higher requirements for the application of UHF RFID positioning technology, the main aspect of the Internet of Things, and the demand for positioning in daily life and production is also increasing. The demand for positioning involves various industries, such as drug tracking and positioning in the medical industry, vehicle tracking and positioning in the transportation industry, food tracking and positioning in the food industry, and poultry tracking and positioning in the animal husbandry industry. Due to the complex indoor environment, small space and various interferences, indoor positioning technology has always been a hot and difficult point in positioning research. As one of indoor wireless positioning technolog...

Claims

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Application Information

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IPC IPC(8): G01S5/10
Inventor 李丽华黄梦选于尧张竞乾
Owner HEBEI AGRICULTURAL UNIV.