Method to prevent rouge transponder responses in automatic vehicle identification systems
First Claim
1. A method for preventing rogue reads in an AVI system comprised of a reader with a read antenna and a transponder comprising:
- transmitting a poll message from a read antenna of a reader to a transponder and having said poll message reflect from an undesirable location creating an undesirable poll message;
transmitting a jamming signal from a point from which undesired poll messages originate for creating a rogue poll message; and
,receiving said rogue poll message by said transponder, thereby preventing said transponder from responding.
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Accused Products
Abstract
A method of preventing a response to a rouge poll message in an AVI system is presented. The method entails that during the transmission of the poll message from the interrogator to the transponder, wherein the poll message reflects off an undesirable position, thereby creating the origination of an undesirable poll message, i.e. a poll message which will be received by a wrong transponder, a jamming signal is also transmitted at the same frequency and from the point from which said reflected poll message originates. The jamming signal and the poll message create a rogue poll message as received by the transponder wherein at least one bit within the transmitted poll message is flipped. Transponders, upon receiving said rogue poll message, calculate the CRC and compare the calculated CRC with the received CRC. The rogue message should yield an invalid CRC, i.e. a CRC unlike the received CRC, and therefore, the transponder will fail to respond to the jammed poll message.
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Citations
24 Claims
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1. A method for preventing rogue reads in an AVI system comprised of a reader with a read antenna and a transponder comprising:
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transmitting a poll message from a read antenna of a reader to a transponder and having said poll message reflect from an undesirable location creating an undesirable poll message; transmitting a jamming signal from a point from which undesired poll messages originate for creating a rogue poll message; and
,receiving said rogue poll message by said transponder, thereby preventing said transponder from responding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for preventing rogue reads in an RF-ID system comprised of a reader with a read antenna and a transponder comprising:
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transmitting a poll message from a read antenna of a reader to a transponder and having said poll message reflect from an undesirable location creating an undesirable poll message; transmitting a jamming signal from a point from which undesired poll messages originate for creating a rogue poll message; and
,receiving said rogue poll message by said transponder, thereby preventing said transponder from responding. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification