Ultra-wideband-based method for activating a function of a vehicle with a portable user equipment item, associated system and device for activating a function

Abstract

A method for activating a vehicle function via ultra-wideband communication by an item of portable user equipment. The device includes a plurality of transceivers, the vehicle function activated depending on a position of the item of portable equipment with respect to a boundary between two authorization zones, an internal zone inside and an external zone outside the vehicle. The method includes: determining the presence of the item of portable equipment in an authorization zone; if the item of portable equipment is located in an authorization zone at a distance from the boundary smaller than a predetermined distance, then: determining that the item of portable equipment is present in a predetermined sub-zone, with which has been associated beforehand two types of transceivers, a first type having at least one signal parameter representative of a direct path of waves and a second type having at least one signal parameter representative of an indirect path of waves, weighting a number of measurements carried out for each transceiver according to its type, and determining the position of the item of portable equipment based on the measurements thus weighted, and activating the vehicle function corresponding to the position of the item of portable equipment.