A passive entry-passive start portable device detection system. A portable device includes a transceiver. At least one vehicle-based transceiver broadcasts an interrogation signal. The transceiver of the portable device transmits a response signal in response to the interrogation signal. A controller determining at least a range of the portable device as a function of the time-of-flight of the interrogation and response signals. The controller controls a measurement duty cycle of the interrogation signal as a function of the determined range.
Time of flight based passive entry/passive start system
2018-02-13
Patent
Electronic Resource
English
IPC: | G08B SIGNALLING OR CALLING SYSTEMS , Signalisier- oder Rufsysteme / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / G07C TIME OR ATTENDANCE REGISTERS , Zeit- oder Anwesenheitskontrollgeräte / H04W WIRELESS COMMUNICATION NETWORKS , Drahtlose Kommunikationsnetze |
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