首页>
外国专利>
Anti-theft remote keyless entry system using frequency hopping with amplitude level control
Anti-theft remote keyless entry system using frequency hopping with amplitude level control
展开▼
机译:带有幅度电平控制的跳频防盗远程无钥匙进入系统
展开▼
页面导航
摘要
著录项
相似文献
摘要
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.
展开▼