Autonomous Vehicle Positioning via Road Attribute Projection
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Solution Overview
Problem
Current autonomous vehicle systems face challenges in accurately determining the relative position of a vehicle with respect to road attributes, which is crucial for navigation, especially when transitioning between different road features or attributes.
Innovation Solution
An autonomous driving system that uses a processor to determine the current position of a vehicle by receiving map data containing road attributes, calculating a trajectory between multiple trajectory points, and projecting road attributes onto this trajectory to compare the vehicle's position with the projection point, allowing for precise navigation and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the vehicle uses traditional GPS-based positioning systems, then the system complexity is low, but the positioning accuracy relative to road attributes is insufficient
Solution Approach 1:
The patent introduces map data and trajectory points as intermediary elements between the GPS positioning system and the road attributes. By projecting road attributes onto the trajectory and comparing with vehicle position, the system achieves accurate relative positioning without directly increasing hardware complexity
Solution Approach 2:
The positioning system is segmented into multiple independent components: GPS receiver for absolute position, map data processor for road attribute extraction, trajectory calculator for path determination, and position comparator for relative positioning. This modular approach improves accuracy while managing system complexity
2Measurement precision
If the vehicle uses detailed map data and trajectory calculation to improve positioning accuracy, then the positioning precision improves, but the computational complexity and processing time increase
Solution Approach 1:
Map data containing road attributes and trajectory points are pre-calculated and stored before the vehicle reaches them. During actual navigation, the system only needs to retrieve and compare these pre-computed data with current GPS position, significantly reducing real-time computational complexity while maintaining high positioning accuracy
3Measurement precision
If the vehicle continuously tracks and compares position with road attributes, then the navigation accuracy improves, but the energy consumption increases
Solution Approach 1:
The position tracking and comparison operations are performed periodically at selected intervals rather than continuously. The system determines current position at discrete time points and compares with pre-calculated trajectory points, maintaining navigation accuracy while reducing energy consumption associated with continuous processing
Data Source
AI summary
Methods and apparatus provided for determining a current position of a vehicle are disclosed. The apparatus includes an autonomous driving system for a vehicle with a positioning system configured to determine a current position of the vehicle between an original point of the vehicle and a horizon point ahead the vehicle. The positioning system is configured to receive map data containing at least one road attribute, receive multiple trajectory points which are located between the original point and the horizon point and determine a trajectory which interconnects the multiple trajectory points, determine an absolute position of the vehicle, determine a projection point from the at least one road attribute onto the trajectory, and determine the current position of the vehicle and compare the current position of the vehicle with a position of the projection point of the road attribute between the original point and the horizon point.