Vehicle Reversing Positioning Switch Between CRLS and GNSS
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Solution Overview
Problem
Current Advanced Driver Assistance Systems (ADAS) and Autonomous Driving (AD) face challenges in accurately aiding vehicle manoeuvring, particularly during reversing, due to varying accuracy of positioning systems like CRLS and GNSS, which can lead to unstable manoeuvres and efficiency bottlenecks.
Innovation Solution
A method and controller that select between CRLS and GNSS positioning systems based on error comparison to ensure the most accurate system is used for aiding vehicle manoeuvring, specifically reversing, by determining and weighing errors from both systems to automatically switch between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single positioning system (CRLS or GNSS) is used for AD/ADAS aided manoeuvring, then the system structure is simple, but the positioning accuracy deteriorates under varying conditions
Solution Approach 1:
The patent combines two positioning systems (CRLS and GNSS) into a unified positioning apparatus that selects between them based on accuracy requirements. The controller integrates both systems and automatically chooses the optimal one for current conditions, achieving high positioning accuracy without requiring complex manual switching.
Solution Approach 2:
The positioning system dynamically adapts by selecting different positioning methods based on real-time accuracy requirements and environmental conditions. The controller continuously evaluates whether CRLS or GNSS provides sufficient accuracy and switches between them accordingly, making the system flexible rather than static.
2Reliability
If the positioning system automatically switches between CRLS and GNSS based on error comparison, then the positioning accuracy is maintained at highest level, but the system complexity increases
Solution Approach 1:
The controller implements feedback by continuously monitoring positioning errors from both CRLS and GNSS systems and automatically adjusting which system is active based on current accuracy performance. This closed-loop control ensures reliable manoeuvring by adapting to changing conditions without manual intervention.
Solution Approach 2:
The positioning system serves itself by automatically evaluating its own performance and selecting the appropriate positioning method without external control. The controller autonomously determines when to switch between CRLS and GNSS based on error comparisons, reducing the need for complex external management.
3Measurement precision
If CRLS based positioning is used in environments with reflective surfaces, then indoor positioning accuracy is improved, but false positioning errors increase due to multipath effects
Solution Approach 1:
The controller acts as an intermediary that evaluates positioning results from both CRLS and GNSS systems and selects the most reliable one. When CRLS suffers from multipath errors in reflective environments, the controller can switch to GNSS as an intermediary solution, maintaining positioning accuracy without being directly affected by the harmful reflective surfaces.
Data Source
AI summary
There is provided mechanisms for AD, or at least ADAS, aided manoeuvring of a vehicle. A method includes selecting between using a CRLS based positioning system and a GNSS based positioning system for aiding manoeuvring of the vehicle. Which positioning system to select is based on comparing a first error determined for the CRLS based positioning system to a second error determined for the GNSS based positioning system. The positioning system with smallest error is selected. The method comprises aiding the manoeuvring of the vehicle using the selected positioning system. The manoeuvring pertains to reversing of the vehicle.