Vehicle User Trajectory Sensing for Impairment-Aware Access Control
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Solution Overview
Problem
Existing methods for determining a drug-related user characteristic, such as impairment due to alcohol or other substances, in vehicle users are not always reliable, particularly due to reliance on image capturing which can be affected by ambient light and obstacles, and may not provide accurate depth perception.
Innovation Solution
A method using a plurality of receivers to receive a positioning signal from a vehicle-related user device, determining the user's trajectory approaching the vehicle, and analyzing this trajectory using machine learning models and sensor data, including camera information, to assess the drug-related user characteristic and output a control signal accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image capturing is used to determine drug-related user characteristics, then visual information can be obtained, but reliability deteriorates due to ambient light and obstacles affecting capture quality
Solution Approach 1:
The patent introduces positioning signals as an intermediary measurement method that indirectly determines user state through trajectory analysis rather than directly observing the user. This mediator approach bypasses the harmful environmental factors affecting direct image capture while still enabling reliable determination of drug-related characteristics.
Solution Approach 2:
The patent replaces the optical/image capturing system with a positioning signal-based system. Instead of using cameras that are susceptible to light and obstacle interference, the system uses receivers to detect positioning signals and analyze user trajectories, substituting a more reliable measurement mechanism.
2Measurement precision
If image capturing is used to determine drug-related user characteristics, then visual features can be analyzed, but measurement precision deteriorates due to limited depth perception in two-dimensional images
Solution Approach 1:
The patent replaces two-dimensional image-based depth estimation with three-dimensional trajectory data derived from positioning signals. The positioning system naturally provides accurate spatial coordinates over time, enabling precise depth and distance measurements without the information loss inherent in flat image captures.
3Measurement precision
If specialized sensors are used to detect alcohol or drugs, then detection accuracy improves, but device complexity and cost increase
Solution Approach 1:
The patent makes the positioning signal system multi-functional by using it not only for location tracking but also for determining drug-related user characteristics through trajectory analysis. This universal approach eliminates the need for specialized alcohol or drug detection sensors, reducing device complexity while maintaining determination capability.
Solution Approach 2:
The patent enables the positioning system to serve itself by analyzing its own collected trajectory data to determine user state. Instead of requiring separate specialized sensors, the existing positioning infrastructure performs multiple functions including drug-related characteristic determination, reducing overall system complexity.
Data Source
Figure 1~3
AI summary
Method for a vehicle of handling a drug-related user characteristic of a user of the vehicle, wherein the method comprises the steps of: receiving, by a plurality of receivers, a positioning signal from a vehicle-related user device indicative of a position of the user; determining, based on the positioning signal, a trajectory of the vehicle-related user device approaching the vehicle; determining, based on the trajectory, the drug-related user characteristic of the user; and outputting a control signal in dependence on the drug-related user characteristic.