Navigation Device Slip Road Traffic Event Correction
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Solution Overview
Problem
Current navigation devices face errors in matching traffic information between heterogeneous maps, leading to inaccurate route searches, especially when closed events occur in ramp sections of expressways, degrading route search quality.
Innovation Solution
A navigation device with a traffic information matching method that includes a matching unit and a correction unit, which receives traffic information, determines if a closed event has occurred on a slip road, and corrects the matching by removing the expressway portion from the matched section, enhancing accuracy by repositioning the start or end point to a ramp section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the OPENLR technique is used to match heterogeneous maps, then the matching process can be performed, but the matching accuracy cannot reach 100% and positions between heterogeneous maps are not accurately matched
Solution Approach 1:
The patent introduces an intermediary correction mechanism that detects matching errors between heterogeneous maps and applies corrective transformations. The correction unit acts as a mediator between the traffic information provider's map and the navigation information provider's map, identifying mismatches (particularly for closed events on slip roads) and applying corrections to achieve accurate positioning and route search.
2Device complexity
If closed events on slip roads are matched using standard OPENLR technique, then the matching process is simplified, but matching errors occur that significantly affect route search
Solution Approach 1:
The patent applies local quality by implementing specialized handling for specific road types (slip roads, ramps, on-ramps, off-ramps) within the broader map matching process. The correction unit identifies closed events occurring on these specific road sections and applies targeted corrections, rather than treating all road segments uniformly. This localized approach improves matching accuracy for critical road sections while maintaining overall process efficiency.
Data Source
AI summary
A navigation device includes: a memory storing map data of a map used for route searching; a traffic information receiving unit receiving traffic information from an external server; a matching unit matching a traffic event included in the received traffic information to the map used for route searching based on the traffic information; and a correction unit performing correction by removing a portion matched to an expressway of the map from a section to which the traffic event is matched on the map by the matching unit. The traffic event includes a closed event on a slip road, and the traffic event is matched to the expressway.