MULTI-PROTOCOL RFID SYSTEM

摘要

A multi-protocol RFID interrogating system employs a synchronization technique (step-lock) for a backscatter RFID system that allows simultaneous operation of closely spaced interrogators. The multi-protocol RFID interrogating system can communicate with backscatter transponders having different output protocols and with active transponders including: Title 21 compliant RFID backscatter transponders; IT2000 RFID backscatter transponders that provide an extended mode capability beyond Title 21; EGOTM RFID backscatter transponders, SEGOTM RFID backscatter transponders; ATA, ISO, ANSI AAR compliant RFID backscatter transponders; and IAG compliant active technology transponders. The system implements a step-lock operation, whereby adjacent interrogators are synchronized to ensure that all downlinks operate within the same time frame and all uplinks operate within the same time frame, to eliminate downlink on uplink interference.

主权项

1. A multiprotocol RFID system comprising:
an interrogator system for communicating with transponders using at least two different protocols in at least two different capture zones, at least one of the protocols having multiple commands, at least two commands being used in communicating with a transponder in each of said capture zones, the communication with the transponders in said capture zones overlapping in time.