Anti-collision method of 2.4G active-electronic-tags (RFID)

Abstract

The invention discloses an anti-collision method of 2.4G active-electronic-tags (RFID). The anti-collision method of the 2.4G active-electronic-tags includes a wireless communication protocol of a reader-writer and the electronic tags and an anti-collision method. Gaussian frequency shift keying (GFSK) is adopted to modulate the reader-writer and the electronic tags, and a work frequency band is 2.4 GHz-2.4835 GHz; the electronic tags are in a cycle transmitting state by default; the reader-writer contains a plurality of simultaneously working radio frequency chips, which respectively use a plurality of wireless channels, and are in a receiving state by default; time is divided into a plurality of frame cycles; the electronic tag randomly selects a moment and a radio frequency channel to broadcast an identity data packet in each frame cycle; The reader-writer can then send a correct response to the tag if any radio frequency chip of the reader-writer correctly receives the data packet;the tag can be in a sleeping state in the next frame cycles after the correct response is received; and the broadcast packet can be continuously sent if the electronic tag does not receive the correct response after the broadcast packet is completely sent at every turn. According to the anti-collision method of the 2.4G active-electronic-tags, the plurality of quickly moved electronic tags can besimultaneously identified, and collision probability is lower.

Description

technical field [0001] The invention relates to the field of wireless communication active electronic tags (RFID), in particular to an anti-collision method for simultaneously identifying multiple 2.4G active electronic tags. Background technique [0002] Electronic tags (RFID) can identify specific targets and read and write data through wireless communication technology. Compared with passive electronic tags, active electronic tags have a relatively long recognition distance. When there are multiple electronic tags within the recognition range of the reader at the same time, if two or more electronic tags transmit radio frequency signals at the same time or the duration of transmitting radio frequency signals overlaps with each other, these radio frequency tags collide, causing the reader cannot be identified correctly. In addition, when the electronic tag quickly passes through the identification area of ​​the reader, the system is required to have a relatively fast ide...

AI Technical Summary

Problems solved by technology

[0003] In the current active RFID identification system, the reader has only one radio frequency chip and uses one radio frequency channel at the same time, which is suitable for scenarios where the number of electronic tags identified at the same time is small and the moving speed of the electronic tags is slow

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