Vehicle UWB Sub-Zone Positioning to Prevent Zone Ping-Pong
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Solution Overview
Problem
Existing vehicle location systems using high-frequency signals, such as ultra-wide band (UWB), suffer from errors due to signal reflection, leading to incorrect determination of user device position, especially when transitioning between zones, causing activation of incorrect vehicle functions.
Innovation Solution
A method involving periodic detection and location of a user device in specific sub-zones within a main zone using UWB transceivers, ensuring accurate positioning by maintaining the device in a single sub-zone until a definitive transition occurs, thereby preventing ping-ponging between zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-frequency signals (UWB) are used for location determination, then location accuracy is improved, but signal reflection causes errors in distance calculation
Solution Approach 1:
The monitoring zone is divided into multiple sub-zones (first sub-zone, second sub-zone, etc.), each associated with specific vehicle functions. This segmentation allows the system to determine which sub-zone the user device is in and activate corresponding functions, resolving the ambiguity caused by signal reflection errors at zone boundaries.
Solution Approach 2:
Different sub-zones have different functional associations. When the user device is detected in a specific sub-zone, only the functions associated with that sub-zone are activated. This local quality approach ensures that even if location accuracy fluctuates due to signal reflection, the system responds appropriately based on the determined sub-zone position.
2Productivity
If periodic position determination is performed, then location updates are frequent, but ping-ponging between sub-zones occurs due to location errors
Solution Approach 1:
The system pre-defines multiple sub-zones with associated vehicle functions before operation. When position determination is performed, the system checks which pre-defined sub-zone the user device falls into and activates the corresponding pre-associated functions, preventing unstable switching by having predetermined response actions for each zone.
Solution Approach 2:
The electronic control unit acts as an intermediary that processes the determined position and determines the appropriate sub-zone based on pre-defined boundaries and associations. This intermediary processing layer filters out position determination errors and ensures stable function activation based on the user device's actual location relative to sub-zone boundaries.
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
Ensures accurate and reliable activation of vehicle functions by maintaining consistent sub-zone location, reducing errors in user device positioning and enhancing user welcome and driving system activation.
Implementation Method 1
each transceiver calculates the total time of flight of the request signal and of the response signal or else determines the power of the received response signal, in order to determine the distance between said transceiver and the user device
Implementation Method 2
These high-frequency signals are reflected more easily by objects and the human body. A reflected signal will follow a longer path, causing error in the distance calculation
Data Source
AI summary
A method for locating a user device in a sub-zone of a main zone defined with respect to a vehicle, especially including detecting the user device in a first sub-zone, locating the user device in the first sub-zone, keeping locating the user device in the first sub-zone for as long as the user device is detected in the first sub-zone, detecting the user device in a second sub-zone, and locating the user device in the second sub-zone when the user device is detected solely in the second sub-zone.