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Method to prevent rouge transponder responses in automatic vehicle identification systems

  • US 5,955,969 A
  • Filed: 04/09/1997
  • Issued: 09/21/1999
  • Est. Priority Date: 04/09/1997
  • Status: Expired due to Term
First Claim
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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:

  • 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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