A MOVEMENT DETECTION METHOD AND READER/WRITERS IN A RADIO FREQUENCY IDENTIFICATION SYSTEM

摘要

This invention proposes a movement detection method in a Radio Frequency Identification (RFID) system which includes one or more reader/writers and a group of tags, wherein each of said tags is attached to a workpiece. The method includes the following steps: firstly, said reader/writers read at least two from said group of tags, capture the received signal strength indication envelopes of said tags, and store the received signal strength indication envelope of one of the tags as a template; secondly, a correlation match is performed for the received signal strength indication envelope of said tags and said template to obtain the time interval between the received signal strength indication envelope of said tags and said template when the correlation value is the maximum. Using the present invention, the reader/writer can report each tag in front of the antenna, even if multiple tags exist in the complicated industrial environment, ensuring FCFR and improving the reliability of the UHF RFID system.