UWB Vehicle Access Positioning Near Authorization Zone Boundaries

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Solution Overview

Problem

Existing 'hands-free' vehicle access systems using Bluetooth or UWB communication struggle with precise location accuracy, particularly when the portable equipment is near the vehicle boundary, failing to meet safety standards and user expectations.

Innovation Solution

A method and device using ultra-wideband communication with a plurality of transceivers, employing signal parameters like time of flight and received signal strength indicator to differentiate direct and indirect paths, and adjusting measurement weights based on transceiver types for improved location accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If Bluetooth or UWB communication is used for hands-free vehicle access, then communication capability is improved, but location accuracy deteriorates and fails to meet safety standards

Engineering Contradiction:

Improvecommunication capabilityVSAvoidlocation accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent segments the measurement process by distinguishing between direct-path transceivers and indirect-path transceivers. Direct-path transceivers (those with line-of-sight to the portable equipment) are weighted more heavily than indirect-path transceivers (those with obstructed paths). This segmentation allows the system to leverage multiple transceivers while prioritizing the most reliable measurements, thereby improving location accuracy to meet safety standards while maintaining communication versatility.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If multiple transceivers are used to improve location accuracy, then measurement precision is improved, but device complexity increases

Engineering Contradiction:

Improvelocation accuracyVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent implements a weighted measurement approach where not all transceiver measurements are treated equally. Instead of requiring complex processing of all possible transceiver signals, the system applies weights based on path type (direct vs. indirect), effectively using a selective subset of measurements with appropriate emphasis. This partial action approach achieves high location accuracy without the full complexity of processing and equal-weighting all transceiver inputs.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent changes the parameter of measurement weighting based on transceiver type. By assigning different weights to direct-path and indirect-path transceivers, the system optimizes location accuracy without adding physical complexity. This parameter change (weighting factor) allows the existing multi-transceiver hardware to achieve superior performance through intelligent signal processing rather than through additional hardware complexity.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Accurately determines the position of portable equipment within 20 cm tolerance, meeting safety standards and ensuring timely vehicle function activation.

Implementation Method 1

employing signal parameters like time of flight and received signal strength indicator to differentiate direct and indirect paths

Methodology Applied

Scientific EffectTime of flight: Time of Flight

Implementation Method 2

via ultra-wideband communication with a plurality of transceivers

Methodology Applied

Scientific EffectElectromagnetic wave propagation: Electromagnetic Induction

Data Source

PatentUS12579856B2Ultra-wideband-based method for activating a function of a vehicle with a portable user equipment item, associated system and device for activating a function

Publication Date: 2026.03.17 CONTINENTAL AUTOMOTIVE TECHNOLOGIES GMBH

AI summary

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.