Anti-theft remote keyless entry system using frequency hopping with amplitude level control
AssigneeTRW Automotive U.S. LLC
InventorXING PING LIN
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Abstract
A method for defeating a two-thief attack on a passive RKE system by using frequency hopping. Radio frequency signals are transmitted between a fob and a vehicle. The transmitted signals hop between at least two radio frequency transmitting channels in a particular pseudo-random pattern known to the vehicle. At the vehicle, the transmitted signals are received in a process that is sequentially adjusted to take account of the known characteristics of each portion of the known pattern. Anomalies in the pattern of the received signals are detected and, if the anomalies exceed permissible limits, access to said vehicle is blocked.
Claims24
A method for preventing security breaches of passive remote keyless entry systems for a vehicle comprising the steps of transmitting signals between a fob and the vehicle at frequencies that changes in a particular pattern and detecting at the receiving side anomalies in the pattern of the received signals.
A method for preventing security breaches of passive remote keyless entry systems for a vehicle, comprising the steps of
- transmitting radio frequency signals from a fob to the vehicle, including the step of hopping between at least two radio frequency transmitting channels in a particular pseudo-random pattern known to the vehicle,
- receiving at the vehicle each portion of said particular pattern and sequentially adjusting the reception to take account of the known characteristics of each portion of the known pattern,
- detecting at the vehicle anomalies in the pattern of the received signals, and
- blocking access to said vehicle when detected anomalies exceed permissible limits.
Dependencies are inferred from the claim text.