UP-SAMPLING AND CROSS-CORRELATION FOR TIME OF ARRIVAL DETERMINATIONS IN PASSIVE ENTRY/PASSIVE START SYSTEMS

Abstract: a vehicle access system includes a first network device that transmits a first tone signal to a second network device and receives a second tone signal from the second network device. the first or second network device is a portable access device. the system includes a control module that receives tone values from a sniffer device located at the vehicle. the tone values are associated with i) a difference in phase of a tone of the first tone signal between when transmitted to when received at the sniffer device, and ii) a difference in phase of the tone of the second tone signal between when transmitted to when received at the sniffer device. the control module estimates a first distance from the vehicle to the second network device based on the tone values received from the sniffer device and permits access to the vehicle based on the first distance.

Inventor(s): Raymond Michael STITT, John VIDETICH

CPC Classification: G01S13/84 (for distance determination by phase measurement)

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