Passive entry passive start (PEPS) system with relay attack prevention

摘要

A system includes a remote control unit, such as a fob, and a base station at a target, such as a vehicle. The control unit and the base station are configured to communicate authorization signals and time-of-flight (ToF) ranging signals concurrently between one another. The base station is further configured to confirm from the authorization signals whether the control unit is authorized for controlling a target function and to confirm from the ToF ranging signals whether the control unit is within range of the target. The base station is further configured to prevent the target function from being controlled by the control unit when the control unit is not within range of the target.

主权项

1. A method comprising:
communicating authorization signals and time-of-flight (ToF) ranging signals concurrently between a portable controller and a base station at a target to confirm from the authorization signals whether the portable controller is authorized for controlling a function of the target and to confirm from the ToF ranging signals whether the portable controller is within range of the target; prior to communicating the authorization signals between the portable controller and the base station, communicating wakeup signals between the portable controller and the base station to wakeup the portable controller and to acknowledge to the base station that the portable controller is awake; and preventing the function of the target to be controlled when the portable controller is not within range of the target.