Movement Detection Method and Reader/Writers in a Radio Frequency Identification System
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Abstract
A method in a Radio Frequency Identification (RFID) system including at least one reader/writer and a group of tags each attached to a workpiece. The method includes reading a plurality of tags from the group of tags, capturing received signal strength indication envelopes of tags, and storing the received signal strength indication envelope one tag as a template. A correlation match is performed for the received signal strength indication envelope of the tags and the template to obtain a time interval between the received signal strength indication envelope of each of the tags and the template when the correlation is at a maximum value. Using the present invention, the at least one reader/writer can report each tag that is directly in front of an antenna, even if multiple tags exist in the complicated industrial environment, ensuring First Come First-Read (FCFR) and improving the reliability of an ultra high frequency RFID system.
13 Citations
40 Claims
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1-19. -19. (canceled)
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20. A movement detection method in a Radio Frequency Identification (RFID) system including at least one reader/writer and a group of tags, each of said tags in the group of tags being attached to a workpiece, the method comprising:
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reading, by said at least one reader/writer, a plurality of tags from said group of tags to capture received signal strength indication envelopes each of said plurality of tags and to store the received signal strength indication envelope of one tag of the plurality of tags as a template; and performing a correlation match between the received signal strength indication envelopes of each of said plurality of tags and said template to obtain a time interval between the received signal strength indication envelopes of each of said plurality of tags and said template when the correlation is at a maximum value. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A reader/writer configured to read and writes tags in a Radio Frequency Identification (RFID) system, comprising:
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a reading unit for reading a plurality of tags from a group of tags and capturing the received signal strength indication envelopes of each of said plurality of tags; a storing unit for storing the received signal strength indication envelope of one of the read tags of the plurality of tags as a template; and a correlation unit for performing a correlation match between the received signal strength indication envelopes of each of said plurality of tags and said template to obtain a time interval between the received signal strength indication envelopes of each of plurality of tags and the template when the correlation is a maximum value. - View Dependent Claims (38, 39, 40)
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Specification