Electronic identification system
DC
First Claim
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1. An electronic identification system comprising an interrogator and a plurality of transpondersthe interrogator comprising:
- transmitter means for transmitting an interrogation signal to the transponders;
each transponder comprising;
signature generating means for generating a unique signature that is a characteristic of the respective transponder, transmitter means for transmitting in response to the interrogation signal, intermittent response signals comprising the signature;
the interrogator further comprising acknowledgement signal generating means for generating upon reception of a response signal from one of the transponders, an acknowledgement signal comprising the unique signature of the one transponder to be transmitted by the transmitter means of the interrogator, thereby to acknowledge reception of the response signal to said one transponder.
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Abstract
An electronic identification system 100 comprises an interrogator 10 and a plurality of transponders 12, 14 and 16. The interrogator comprises a transmitter 11 for transmitting an interrogation signal to the transponders; a receiver 13 for receiving response signals from the transponders; and a controller 19 for processing response signals received, to identify the transponders by their respective response signals. Each transponder comprises a signature generator 35, 32 for generating a unique signature characteristic of the transponder and intermittently transmits, in responses to the interrogation signal, a response signal including the signature. The interrogator further comprises an acknowledgement signal generator 21 for generating upon reception of a response signal from one of the transponders, an acknowledgement signal to be transmitted by the transmitter 11. The acknowledgement signal comprises the signature, thereby to acknowledge reception of the response signal.
81 Citations
17 Claims
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1. An electronic identification system comprising an interrogator and a plurality of transponders
the interrogator comprising: -
transmitter means for transmitting an interrogation signal to the transponders;
each transponder comprising;
signature generating means for generating a unique signature that is a characteristic of the respective transponder, transmitter means for transmitting in response to the interrogation signal, intermittent response signals comprising the signature;
the interrogator further comprising acknowledgement signal generating means for generating upon reception of a response signal from one of the transponders, an acknowledgement signal comprising the unique signature of the one transponder to be transmitted by the transmitter means of the interrogator, thereby to acknowledge reception of the response signal to said one transponder. - View Dependent Claims (2, 3, 4, 5, 6, 8)
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7. A system as claimed in 4 wherein the random number generator includes means for generating a divisor for a programmable clock frequency divider of the transponder to yield a randomly selected clock frequency for the transponder.
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9. An interrogator for use with an electronic identification system also comprising a plurality of transponders, the interrogator comprising:
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transmitter means for transmitting an interrogation signal to the plurality of transponders;
receiver means for receiving response signals originating from the plurality of transponders, each response signal comprising a signature that is a characteristic of a respective transponder from which the signature originates; and
a controller for processing at least one of the response signals received and for causing an acknowledgement signal comprising the signature to be transmitted.
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10. A transponder comprising:
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receiver means for receiving an interrogation signal;
signature generating means for generating a signature characteristic of the transponder;
transmitter means for transmitting in response to the interrogation signal a response signal comprising the signature characteristic of the transponder; and
a controller for causing the transponder to switch from one mode of operation to another, if an acknowledgement signal comprising the signature is received. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of operating an electronic identification system comprising an interrogator and a plurality of transponders, the method comprising the steps of:
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transmitting from the interrogator an interrogating signal to the transponders;
causing the transponders to receive the interrogation signal and each intermittently to respond with a response signal comprising a signature characteristic of the respective transponder, causing the interrogator to receive the response signals and to process a response signal from at least one of the transponders;
causing the interrogator to transmit an acknowledgement signal comprising the signature of the at least one of the transponders; and
causing the at least one of the transponders upon reception of the acknowledgement signal to switch from one mode of operation to another mode of operation.
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Specification
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Litigation Data
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Current AssigneeZebra Technologies Corporation
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Original AssigneeSupersensor Limited
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InventorsKruger, Johan Dawid, Turner, Christopher Gordon Gervase
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Primary Examiner(s)Gregory, Bernarr E.
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Application NumberUS09/435,467Time in Patent Office1,100 DaysField of Search342/30-32, 342/42-51, 370/445US Class Current342/44CPC Class CodesG06K 7/0008 General problems related to...G06K 7/10059 transponder driven
