Method and apparatus for an anti-theft system against radio relay attack in passive keyless entry/start systems
First Claim
1. A method for identifying unauthorized access to a vehicle having a keyless-passive entry system, the method comprising the steps of:
- broadcasting an interrogation signal from a vehicle based transmission device, the interrogation signal having a first pulse transmitted at a first amplitude and a second pulse transmitted at a second amplitude where the second amplitude is greater than the first amplitude by at least a predetermined difference threshold;
receiving the interrogation signal by a portable communication device;
determining if the second amplitude of the second pulse is greater than the first amplitude of the first pulse by at least the predetermined difference threshold; and
determining that the interrogation signal is an authorized interrogation signal in response to the determination that the received interrogation signal includes the first pulse transmitted at the first amplitude followed by the second pulse transmitted at a second amplitude where the second amplitude is greater than the first amplitude by at least a predetermined difference threshold.
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Accused Products
Abstract
An apparatus and method is provided for identifying unauthorized access to a vehicle having a keyless-passive entry system. An interrogation signal is broadcast from a vehicle based transmission device. The interrogation signal includes a first pulse transmitted at a first amplitude and a second pulse transmitted at a second amplitude where the second amplitude is greater than the first amplitude by at least a predetermined difference threshold. The interrogation signal is received by a portable communication device. A determination is made whether the second amplitude of the second pulse is greater than the first amplitude of the first pulse by a predetermined difference threshold. A determination is made that the interrogation signal is an authorized interrogation signal in response to the determination that the interrogation signal includes the first pulse transmitted at the first amplitude following by the second pulse transmitted at the second amplitude where the second amplitude is greater than the first amplitude by at least a predetermined difference threshold.
27 Citations
20 Claims
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1. A method for identifying unauthorized access to a vehicle having a keyless-passive entry system, the method comprising the steps of:
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broadcasting an interrogation signal from a vehicle based transmission device, the interrogation signal having a first pulse transmitted at a first amplitude and a second pulse transmitted at a second amplitude where the second amplitude is greater than the first amplitude by at least a predetermined difference threshold; receiving the interrogation signal by a portable communication device; determining if the second amplitude of the second pulse is greater than the first amplitude of the first pulse by at least the predetermined difference threshold; and determining that the interrogation signal is an authorized interrogation signal in response to the determination that the received interrogation signal includes the first pulse transmitted at the first amplitude followed by the second pulse transmitted at a second amplitude where the second amplitude is greater than the first amplitude by at least a predetermined difference threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A keyless-passive entry system for identifying unauthorized access to a vehicle, the system comprising:
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a portable communication device carried by a user of a vehicle for accessing entry to the vehicle; a vehicle based transmission device in communication with the portable communication device; an interrogation signal broadcast by the vehicle based transmission device as a low frequency signal, the interrogation signal having a first pulse transmitted at a first amplitude followed by a second pulse transmitted at a second amplitude, the second amplitude is greater than the first amplitude by a predetermined difference threshold, the portable communication device receiving a received signal the interrogation signal being broadcast from the vehicle based communication device and received by the portable communication device, the portable communication device determines the interrogation signal is an authorized interrogation signal in response to the determination that the second amplitude of the second pulse is greater than the first amplitude of the first pulse by at least the predetermined difference threshold. - View Dependent Claims (17, 18, 19, 20)
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Specification