Road Marker Guidance for Precise Autonomous Vehicle Positioning
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Solution Overview
Problem
Current vehicle navigation systems lack efficient methods for autonomous vehicles to accurately determine their position, velocity, and orientation on roads, especially in scenarios requiring bidirectional travel and complex lane changes, intersections, and dynamic route adjustments.
Innovation Solution
The implementation of a road-based vehicle guidance system that includes reference elements such as magnetic markers embedded in the road, combined with navigation sensors and processors that detect these elements to determine the vehicle's position, velocity, and orientation, and provide steering and speed corrections to ensure safe and efficient navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional GPS-based navigation is used, then the system is simple and low-cost, but the positioning precision and reliability are insufficient for autonomous vehicle operations
Solution Approach 1:
Magnetic markers embedded in the road serve as intermediary reference elements between the vehicle's navigation sensor and the road infrastructure. These markers create a detectable magnetic field that the navigation sensor can use to determine vehicle position, velocity, and orientation with high precision, resolving the contradiction by introducing a mediating physical field rather than relying solely on complex computational methods
Solution Approach 2:
The patent replaces traditional mechanical/GPS-based positioning systems with a magnetic field-based detection system. Magnetic markers generate magnetic fields that are detected by the navigation sensor, substituting mechanical positioning methods with electromagnetic field interactions to achieve higher precision without proportionally increasing system complexity
2Measurement precision
If reference elements are embedded in the road, then navigation accuracy is improved, but the manufacturing and installation complexity of the road increases
Solution Approach 1:
The road infrastructure is segmented into discrete magnetic marker elements that can be independently manufactured and embedded at specific locations. This segmentation allows the complex task of creating a magnetic reference system to be broken down into manageable units, reducing the overall manufacturing complexity while maintaining high navigation accuracy
Solution Approach 2:
Magnetic markers are pre-installed in the road during construction or maintenance phases, creating a permanent navigation infrastructure before vehicles operate. This preliminary action eliminates the need for real-time system configuration and simplifies ongoing deployment, as the reference elements are already in place and require only activation and calibration
3Reliability
If the navigation system uses multiple detection methods, then the reliability is improved, but the device complexity and energy consumption increase
Solution Approach 1:
The magnetic markers passively generate magnetic fields without requiring active power consumption or complex processing. The vehicle's navigation sensor actively detects these fields, creating an asymmetric energy relationship where the infrastructure serves itself by simply existing, while the moving vehicle performs the detection work. This reduces overall system energy consumption compared to active beacon systems
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
This solution enables autonomous vehicles to navigate roads accurately and efficiently, allowing for bidirectional travel and dynamic route adjustments, enhancing safety and convenience by providing precise positioning and orientation data for autonomous operation.
Implementation Method 1
a road may include a composite material that includes concrete or asphalt, and a set of reference elements (e.g., magnetic markers) disposed in or on the composite material
Data Source
AI summary
A vehicle may include a frame structure, a body mounted to the frame structure, and a vehicle navigation system. The vehicle navigation system may include a navigation sensor mounted to the frame structure, and a processor in communication with the navigation sensor. The navigation sensor may be configured to detect reference elements disposed in or on a road on which the vehicle travels. The processor may be configured to receive, from the navigation sensor, signals indicative of a sequence or pattern of detected reference elements. The processor may also be configured to determine, using the received signals, at least one of a position, velocity, or orientation of the vehicle on the road.