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Indoor RFID precise positioning method and device

A technology for precise positioning and estimating position, applied in the field of wireless communication, it can solve the problems of inaccurate positioning, reflection loss, walls susceptible to multi-path propagation, etc., and achieve the effect of improving positioning accuracy and solving positioning problems.

Inactive Publication Date: 2015-02-04
FOMRFID HI TECH SHANGHAICO
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Problems solved by technology

[0004] However, in the above two methods, due to the existence of reflection and scattering phenomena, the information propagation delay estimated by the reader includes the delay of the direct signal and the additional delay caused by reflection or scattering, and the reader-writer The received signal energy is also affected, and is easily affected by multipath propagation and wall reflection loss, resulting in inaccurate positioning and can only be located in a larger area

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Embodiment Construction

[0053] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0054] figure 1 It is a flowchart of an indoor RFID precise positioning method provided by a specific embodiment of the present invention. Such as figure 1 As shown, a kind of indoor RFID accurate positioning method described in the present invention comprises:

[0055] The reader receives the signal strength information of the measuring tags in the building;

[0056] The positioning algorithm AOA based on the signal angle of arrival obtains the estimated position of the measurement tag;

[0057]Adjust the estimated position based on the signal strength ranging algorithm RSSI to obtain the optimal position;

[0058] Based on the pre-established location database, a pattern matching algorithm is used to obtain the optimal location for the optimal location.

[0059] The present invention places a...

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Abstract

The invention relates to the technical field of wireless communication, and in particular relates to indoor RFID precise positioning method and device. The positioning method comprises the following steps: receiving signal strength information of a measuring label in a building through a reader; obtaining an estimated position of the measuring label based on the positioning algorithm AOA (Angle of Arrival) of the signal; adjusting the estimated position based on the signal strength ranging algorithm RSSI (Received Signal Strength Indicator) to obtain an optimal position; performing the pattern matching algorithm for the optimal position to obtain the best position. According to the positioning method, the estimated position of the measuring label is calculated by the AOA algorithm, then the estimated position is optimized by the RSSI algorithm to obtain the optimal position, and finally the matching positioning is performed for the optimal position based on the pre-built position database to obtain the accurate best position of the measuring label; a plurality of technologies are combined, and therefore, the positioning precision is improved, and the problem of positioning in a large building can be solved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an indoor RFID precise positioning method and device. Background technique [0002] With the popularization and development of mobile computing devices, wireless positioning technology has attracted increasing attention. Radio Frequency Identification (RFID) is a technology that uses radio frequency signals to achieve contactless information transmission through spatial coupling (alternating magnetic fields or electromagnetic fields) and through The technology by which the information transmitted achieves the purpose of identification. The RFID system is mainly composed of two parts: an RFID tag with an identity mark (ID number), and an RFID reader that reads information from the tag or writes information into the tag. The RFID system is suitable for a large number of tags because of its low cost. Deployment has a good application prospect in location positioning ...

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Application Information

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IPC IPC(8): G01S5/04
CPCG01S5/06
Inventor 陈湧
Owner FOMRFID HI TECH SHANGHAICO
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