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Securing method, interrogation unit and securing system for implementing the securing method

  • US 7,034,676 B2
  • Filed: 04/04/2001
  • Issued: 04/25/2006
  • Est. Priority Date: 04/19/2000
  • Status: Expired due to Fees
First Claim
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1. A securing method for securing an object against unauthorized use, comprising:

  • transmitting an interrogation signal (s) by an interrogation unit (1) allocated to the object,by a response unit (2) allocated to a user, responding to the interrogation signal (s) by transmitting a response signal (r),testing whether the response signal contains as information an authorization code authorized for desecuring a security device (3), andevaluating a signal transit time of the interrogation signal transmitted by the interrogation unit and the response signal transmitted by the response unit and received by the interrogation unit during a monitoring time interval (t4

    t5), and preventing a desecuring of the security device (3) if the signal transit time is greater than a prescribed value,whereinthe interrogation signal (s) contains a first data bit sequence (Dl) as information and the response signal contains a second data bit sequence (D2) as information, wherein data bits of the first and second data bit sequences (D1, D2) are transmitted in bit cells of equal size, and the interrogation unit (1) simultaneously transmits data bits of the first data bit sequence (D1) and receives data bits of the second data bit sequence (D2) in the monitoring time interval (t4

    t5),the first data bit sequence (D1) is composed of an interrogation code and a filler code adjoining the interrogation code, andthe response unit, for generating the second data bit sequence (D2), generates a response code (AO) from the interrogation code, wherein the response code is encoded bitwise with simultaneously received bits of the filler code and transmitted.

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