Navigation System Intersection Image Alignment
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Solution Overview
Problem
Conventional navigation systems inaccurately determine and announce traveling directions at intersections, often misaligning the enlarged intersection image and voice guidance, leading to insufficient display of relevant areas and inconsistent voice instructions, especially at consecutive intersections.
Innovation Solution
The navigation system determines the traveling direction by calculating the angular difference between the approach and exit directions at an intersection, aligning the approach direction with the 12 o'clock position on the screen and using voice codes to announce the correct direction, even for consecutive intersections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional method aligns the approach direction with the 12 o'clock position using shape complementary points, then the enlarged intersection image can be displayed, but the entire approach link cannot be aligned with the 12 o'clock direction, causing misalignment and insufficient display of relevant areas
Solution Approach 1:
The patent changes the reference parameter from shape complementary points to crossing points between a circle (centered at intersection, radius = length of approach link) and the approach link. This parameter change enables the entire approach link to be aligned with the 12 o'clock direction, resolving the misalignment issue while maintaining the enlarged intersection image display functionality.
2Ease of operation
If the conventional method determines traveling direction at consecutive intersections, then voice guidance can be provided, but the directions become inconsistent and inaccurate
Solution Approach 1:
The patent applies the same parameter change (from shape complementary points to circle-crossing points) consistently across consecutive intersections. By using the circle method for both first and second intersections, the system achieves consistent and accurate traveling direction determination, eliminating the inconsistencies present in conventional methods.
3Ease of manufacture
If the conventional method uses shape complementary points for direction calculation, then the system can function with existing data structures, but the determined directions are inaccurate and inconsistent
Solution Approach 1:
The patent changes the calculation parameter from shape complementary points to crossing points of a circle with the approach link. This parameter change improves reliability by providing accurate and consistent direction determination, while maintaining ease of manufacture since the circle method can be implemented with standard computational geometry operations on existing map data structures.
Data Source
AI summary
When a vehicle travels along a guidance path and approaches an intersection, a vehicle navigation system determines crossing points between a circle having its center set to the intersection and a predetermined radius, and an approach link and an exit link for the intersection. The system also sets a direction connecting the crossing point for the approach link and the intersection as an approach direction, and sets a direction connecting the intersection and the crossing point for the exit link as an exit direction. The system determines a traveling direction at the intersection based on an angular difference between the approach direction and the exit direction, and determines a display position of the intersection on a screen. Further, an enlarged intersection image is drawn such that the approach direction is aligned with a 12 o'clock direction on the screen.