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Anti-theft protection system for a motor vehicle, and a method for operating an anti-theft protection system

  • US 20020008615A1
  • Filed: 11/30/2000
  • Published: 01/24/2002
  • Est. Priority Date: 11/30/1999
  • Status: Active Grant
First Claim
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1. An anti-theft protection system for a motor vehicle, the anti-theft protection system comprising:

  • a transmitting and receiving unit adapted to be arranged on the motor vehicle, the transmitting and receiving unit transmitting a transmitted signal that is modulated over a broad bandwidth;

    a code transmitter adapted to be portable with respect to the motor vehicle, the code transmitter transmitting an echo signal at least in response to receiving the transmitted signal; and

    an evaluation unit evaluating the echo signal to determine authorization of the code transmitter and to determine a distance between the code transmitter and the transmitting and receiving unit.

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