The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 2019
Filed:
Dec. 22, 2017
Ford Global Technologies, Llc, Dearborn, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
The disclosure relates to a method and an apparatus to secure a system for passive unlocking of a vehicle system, particularly a vehicle unlocking system, against relay station attacks. The system comprises a vehicle-based device that can send on a first radio frequency and receive on a second radio frequency, and a driver-based device that can receive on the first radio frequency and send on the second radio frequency. The vehicle-based device and/or the driver-based device are also able to receive on a radio frequency that the other device can receive. One of the two devices send at least one ambient noise signal sequence to the other device. The ambient noise signal sequences received by both are compared with one another with cross-correlation. A current situation is deemed safe if the cross-correlation is strong and a phase shift is small.