Identification system for verifying an authorization to access an object or to use an object, particularly a motor vehicle
First Claim
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1. An identification system for verifying an authorization to access a motor vehicle, said system comprising:
- a send and receive unit disposed on the vehicle to transmit an interrogation signal with section-wise modified carrier frequency in modulated form according to a sequence,a mobile encoder to generate a response signal by sending back the received sequence in encrypted and modulated form, andan evaluation unit on the vehicle to decrypt the response signal and compare it with the interrogation signal with regard to a frequency offset and determine the distance between the encoder and the object as a function of the result of the comparison.
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Abstract
An identification system is disclosed in which an interrogation signal is emitted on the side of the object, the signal having a carrier frequency which is modified in sections. A mobile encoder (20) encodes the interrogation signal and produces a response signal which is sent back to the object (10). The response signal is mixed with the interrogation signal and decoded in an evaluation unit (14–16) on the side of the object. The distance (d) between the encoder (20) and the object (10) is then determined by means of Fourier transformation (16).
30 Citations
14 Claims
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1. An identification system for verifying an authorization to access a motor vehicle, said system comprising:
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a send and receive unit disposed on the vehicle to transmit an interrogation signal with section-wise modified carrier frequency in modulated form according to a sequence, a mobile encoder to generate a response signal by sending back the received sequence in encrypted and modulated form, and an evaluation unit on the vehicle to decrypt the response signal and compare it with the interrogation signal with regard to a frequency offset and determine the distance between the encoder and the object as a function of the result of the comparison. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An identification system for verifying an authorization to access a motor vehicle, said system comprising:
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a send and receive unit disposed on the vehicle which transmits a first interrogation signal with section-wise modified carrier frequency according to a sequence and a second interrogation signal in modulated form at a different carrier frequency, a mobile encoder to correlate the first and the second interrogation signal and send back a response signal, and an evaluation unit on the vehicle to compare the response signal together with an encoded reference signal with regard to a frequency offset and determine the distance between the encoder and the object as a function of the result of the comparison.
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8. A method for verifying an authorization to access an object or to use a motor vehicle, said method comprising:
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transmitting an interrogation signal with section-wise modified carrier frequency in modulated form according to a sequence, generating a response signal by sending back the received sequence in encrypted and modulated form, and decrypting the response signal and comparing it with the interrogation signal with regard to a frequency offset and determining the distance between an encoder and vehicle as a function of the result of the comparison. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A Method for verifying an authorization to access a motor vehicle, said method comprising:
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transmitting a first interrogation signal with section-wise modified carrier frequency according to a sequence and a second interrogation signal in modulated form at a different carrier frequency, correlating the first and the second interrogation signal and sending back a response signal, and comparing the response signal together with an encoded reference signal with regard to a frequency offset and determining the distance between an encoder and the vehicle as a function of the result of the comparison.
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Specification