A radio frequency identification anti-collision method

Abstract

The invention relates to an improved radio frequency identification anti-collision method, aiming at the multi-label return signal collision problem when the reader-writer in the existing UHF radio-frequency identification air interface protocol national standard recognizes multiple tags, combined with the actual reader-writer It improves the anti-collision method recommended in the air interface protocol standard, optimizes the judgment logic of multi-tag collision, makes full use of the capture effect of the tag return signal, and adjusts the command when the reader recognizes multiple tags The sequence can reduce the collision probability of the tag return signal and improve the overall recognition efficiency of the reader for multiple tags. The purpose of the invention is to improve the existing anti-collision method, and improve the efficiency and accuracy of the multi-tag identification of the reader-writer.

Description

technical field [0001] The invention relates to ultra-high frequency radio frequency identification technology, in particular to a radio frequency identification anti-collision method. Background technique [0002] In radio frequency identification technology, the data exchange is realized through wireless communication between the reader-writer and the tag. The reader-writer sends a command to the tag, and the tag performs the corresponding operation according to the command of the reader-writer, and returns the result data to the reader-writer. The wireless communication protocol between the reader and the tag is called the air interface protocol. [0003] With the release of the national standard for the UHF air interface protocol, the application fields of radio frequency identification technology are increasing. Radio frequency identification technology has the advantage of fast identification of multiple targets, but there is also the problem of low identification eff...

AI Technical Summary

Problems solved by technology

[0007] The invention discloses an improved radio frequency identification anti-collision method, aiming at the multi-label return signal collision problem when the reader-writer in the existing UHF radio frequency identification air interface protocol national standard recognizes multiple tags, combined with actual reading and writing The anti-collision method recommended in the air interface protocol standard has been improved, the judgment logic of multi-tag collision has been optimized, the capture effect of the tag return signal has been fully utilized, and the reader has adjusted the time when the reader recognizes multiple tags. The command sequence can reduce the collision probability of the tag's return signal and improve the overall recognition efficiency of the reader for multiple tags

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