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A rfid indoor positioning algorithm based on the phase difference of double tag array

An indoor positioning and phase difference technology, which is applied to services based on location information, services based on specific environments, positioning, etc., can solve the problems of poor positioning effect, large error, and low positioning accuracy, and achieve good positioning effect and error. Small size and high positioning accuracy

Active Publication Date: 2020-09-15
FOSHAN SHUNDE SUN YAT SEN UNIV RES INST +2
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AI Technical Summary

Problems solved by technology

Existing FD-PDOAs use a single tag to obtain the phase difference, which has a large error, low positioning accuracy, and poor positioning effect

Method used

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  • A rfid indoor positioning algorithm based on the phase difference of double tag array
  • A rfid indoor positioning algorithm based on the phase difference of double tag array
  • A rfid indoor positioning algorithm based on the phase difference of double tag array

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Embodiment Construction

[0055] refer to Figure 1 to Figure 5 , an RFID indoor positioning algorithm based on the phase difference of a double-tag array, including the following steps:

[0056] S1: Obtain the phase difference by using a double-label array;

[0057] S2: Eliminate phase ambiguity;

[0058] S3: According to the relationship between the phase information and the distance, calculate the distance difference between the tag array and the multiple antennas, and obtain multiple hyperbolas to achieve;

[0059] S4: Based on the deflection angle problem that may exist in the double-label array, construct the objective function and use the genetic algorithm to find the optimal solution to realize the positioning.

[0060]The phase difference is obtained by double-label display, and the obtained data is more accurate; after that, the phase ambiguity is eliminated to obtain more accurate data. According to the relationship between the phase information and the distance, the distance difference be...

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Abstract

The invention discloses an RFID indoor positioning algorithm based on a dual-label array phase difference, and the method comprises the following steps: acquiring a phase difference at the same frequency by using double labels to form an array; processing phase data to eliminate phase ambiguity; calculating the distance difference between the label array and the multiple antennas through the relationship between the phase information and the distance, and obtaining multiple hyperbolic curves for hyperbolic positioning; considering the deflection angle of the dual-label array, transforming a positioning problem into a multi-dimensional function optimization problem by constructing an objective function; and solving a final positioning result by a genetic algorithm. The obtained result has asmall error, the positioning accuracy is high and the positioning effect is good.

Description

technical field [0001] The invention relates to indoor positioning technology, in particular to an RFID indoor positioning algorithm based on the phase difference of a double tag array. Background technique [0002] RFID is the abbreviation of Radio Frequency Identification, that is, radio frequency identification technology. RFID technology can identify high-speed moving objects and can identify multiple tags at the same time, and the operation is fast and convenient. Traditional indoor positioning algorithms based on RFID technology can be divided into two categories: ranging-based positioning algorithms and distance-independent positioning algorithms. At present, many researchers have turned their attention to the positioning method based on the phase difference, and the more common method is to use the FD-PDOA method to obtain the phase difference of the tag at different frequencies, convert it into a distance and use the least squares method for position estimation. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/021H04W4/33H04W4/80H04W64/00G01S5/06
CPCG01S5/06H04W4/021H04W4/33H04W4/80H04W64/00
Inventor 谭洪舟陈熙衡曾衍瀚王嘉奇方魏谈磊
Owner FOSHAN SHUNDE SUN YAT SEN UNIV RES INST
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