Identification system
First Claim
1. A method of identifying a plurality of transponders, the method comprising receiving at an interrogator a chain of data transmission blocks from each transponder, wherein a first data transmission block in the chain of data transmission blocks contains a transponder identity, a data transmission block number derived from a counter in the transponder, and number of data transmission blocks in the chain of data transmission blocks;
- one or more further data transmission blocks containing additional block data, the data transmission block number and an error checking code, wherein the error checking code for each of the one or more further data transmission blocks is calculated based on a previous further data transmission block;
the data transmission block number being changed automatically as each data block is transmitted.
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Accused Products
Abstract
A method of identifying a plurality of transponders, the method comprising receiving at an interrogator one or more data transmission blocks from each transponder, wherein the first data block contains a uniquely detectable transponder identity and zero or more further data blocks defining a set of data blocks making up a transponder transmission. The first data transmission block also contains in transmission block number; one or more further data transmission blocks containing additional block data and a respective transmission block number; the block number being changed, by decrement or increment, automatically as each data block is transmitted.
14 Citations
17 Claims
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1. A method of identifying a plurality of transponders, the method comprising receiving at an interrogator a chain of data transmission blocks from each transponder, wherein a first data transmission block in the chain of data transmission blocks contains a transponder identity, a data transmission block number derived from a counter in the transponder, and number of data transmission blocks in the chain of data transmission blocks;
- one or more further data transmission blocks containing additional block data, the data transmission block number and an error checking code, wherein the error checking code for each of the one or more further data transmission blocks is calculated based on a previous further data transmission block;
the data transmission block number being changed automatically as each data block is transmitted. - View Dependent Claims (2, 3, 4, 5, 6)
- one or more further data transmission blocks containing additional block data, the data transmission block number and an error checking code, wherein the error checking code for each of the one or more further data transmission blocks is calculated based on a previous further data transmission block;
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7. A method of identifying a plurality of transponders comprises transmitting an interrogation signal to the transponders and receiving response signals from the transponders, each response signal comprising a chain of data transmission blocks;
- a first data transmission block in the chain of data transmission blocks containing a transponder identity, a data transmission block number derived from a counter in the transponder, and further containing a number of data transmission blocks in the chain of data transmission blocks derived from the counter in the transponder;
one or more further data transmission blocks containing additional block data, and an error checking code, wherein the error checking code for each of the one or more further data transmission blocks is calculated based on a previous further data transmission block;
the data transmission block number being decremented automatically by the transponder as each data transmission block of the one or more further data transmission blocks is transmitted. - View Dependent Claims (8, 9)
- a first data transmission block in the chain of data transmission blocks containing a transponder identity, a data transmission block number derived from a counter in the transponder, and further containing a number of data transmission blocks in the chain of data transmission blocks derived from the counter in the transponder;
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10. An identification system comprising an interrogator and a plurality of transponders, the interrogator including a transmitter for transmitting an interrogation signal to the transponders, each transponder including a receiver for receiving the interrogation signal, a transmitter for transmitting a response signal, the response signal comprising a chain of data transmission blocks;
- a first data transmission block in the chain of data transmission blocks containing a transponder identity, a data transmission block number derived from a counter in the transponder, and further containing a number of data transmission blocks in the chain of data transmission blocks derived from the counter in the transponder; and
one or more further data transmission blocks in the chain of data transmission blocks containing additional block data number and an error checking code, wherein the error checking code for each of the one or more further data transmission blocks is calculated based on a previous further data transmission block;
the data transmission block number being changed automatically by the transponder as each data transmission block is transmitted. - View Dependent Claims (11)
- a first data transmission block in the chain of data transmission blocks containing a transponder identity, a data transmission block number derived from a counter in the transponder, and further containing a number of data transmission blocks in the chain of data transmission blocks derived from the counter in the transponder; and
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12. A transponder, the transponder including a receiver for receiving an interrogation signal from an interrogator, a transmitter for transmitting a response signal after receipt of the interrogation signal, the response signal comprising a chain of data transmission blocks;
- a first data transmission block containing a transponder identity, a data transmission block number derived from a counter in the transponder, and a number of data transmission blocks in the chain of data transmission blocks derived from the counter in the transponder; and
one or more further data transmission blocks containing additional block data number and an error checking code, wherein the error checking code for each of the one or more further data transmission blocks is calculated based on a previous further data transmission block;
the data transmission block number being changed automatically as each data block is transmitted. - View Dependent Claims (13, 14)
- a first data transmission block containing a transponder identity, a data transmission block number derived from a counter in the transponder, and a number of data transmission blocks in the chain of data transmission blocks derived from the counter in the transponder; and
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15. An integrated circuit for use in a transponder including a receiver for receiving an interrogation signal, a transmitter for transmitting a response signal after receipt of the interrogation signal, the response signal comprising a chain of data transmission blocks;
- a first data transmission block in the chain of data transmission blocks containing a transponder identity, a data transmission block number derived from a counter in the transponder, and a number of data transmission blocks in the chain of data transmission blocks derived from the counter in the transponder; and
one or more further data transmission blocks containing additional block data number and an error checking code, wherein the error checking code for each of the one or more further data transmission blocks is calculated based on a previous further data transmission block;
the data transmission block number being incremented or decremented automatically as each data block is transmitted. - View Dependent Claims (16, 17)
- a first data transmission block in the chain of data transmission blocks containing a transponder identity, a data transmission block number derived from a counter in the transponder, and a number of data transmission blocks in the chain of data transmission blocks derived from the counter in the transponder; and
Specification