Identification system for verifying an authorization to access an object or to use an object, particularly a motor vehicle
AssigneeSiemens Aktiengesellschaft
InventorAlbert Ott
Life of this patent
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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).
Claims14
Identification system for verifying an authorization to access an object or to use an object, particularly a motor vehicle, comprising:
- a send and receive unit disposed on the object side which transmits an interrogation signal with section-wise modified carrier frequency in modulated form according to a sequence,
- a mobile encoder which generates a response signal by sending back the received sequence in encrypted and modulated form, and
- an evaluation unit on the object side which decrypts the response signal and compares it with the interrogation signal with regard to a frequency offset and which determines the distance between encoder and object as a function of the result of the comparison.
Identification system for verifying an authorization to access an object or to use an object, in particular a motor vehicle, comprising:
- a send and receive unit disposed on the object side 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 which correlates the first and the second interrogation signal and sends back a response signal, and
- an evaluation unit on the object side which compares the response signal together with an encoded reference signal with regard to a frequency offset and determines the distance between encoder and object as a function of the result of the comparison.
Method for verifying an authorization to access an object or to use an object, particularly a motor vehicle, comprising the steps of:
- 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 encoder and object as a function of the result of the comparison.
Method for verifying an authorization to access an object or to use an object, in particular a motor vehicle, comprising the steps:
- 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 encoder and object as a function of the result of the comparison.
Dependencies are inferred from the claim text.