Vehicle-mounted Positioning via Intersection Distance Correction
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Solution Overview
Problem
Existing vehicle-mounted information processing systems face challenges in accurately detecting the position of another vehicle, particularly at intersections, due to limitations in GPS error correction and map matching, which affects crash prediction and communication timing.
Innovation Solution
A vehicle-mounted information processing apparatus that utilizes inter-vehicle communication to acquire GPS information and map data, including reference intersection point distances, to accurately specify the position of another vehicle by correcting it relative to recognized intersection points and estimating new road and intersection information when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If GPS error correction is performed using map matching, then position detection speed is improved, but position detection accuracy deteriorates
Solution Approach 1:
The position correction process is divided into two distinct methods: a first method using map matching for rapid position detection, and a second method using intersection point distance for high-accuracy correction. The system selectively applies each method based on the situation, segmenting the overall correction process to balance speed and accuracy requirements.
Solution Approach 2:
The system performs preliminary map matching to obtain a rough position estimate quickly, then uses this as a basis for more accurate intersection point distance-based correction when needed. This preliminary action allows the system to maintain speed while preparing for accuracy enhancement.
2Measurement precision
If intersection point distance information is used for position correction, then position accuracy is improved, but system complexity increases
Solution Approach 1:
The system uses universal map information that already contains both road data and intersection point data. The same map matching infrastructure is leveraged to provide intersection point distance calculations, allowing the system to achieve higher accuracy without proportionally increasing complexity by reusing existing components.
Solution Approach 2:
The map information serves as an intermediary that contains pre-stored intersection point data. Instead of directly calculating intersection points in real-time, the system uses this pre-prepared map data as a mediator to provide accurate position correction, reducing computational complexity.
3Productivity
If map matching is performed with incomplete map information, then position specification speed is improved, but reliability deteriorates
Solution Approach 1:
The system performs position specification using available map information even if it is incomplete or may contain errors. Rather than waiting for complete and verified map data, it takes partial action with current information to maintain speed, while having error correction mechanisms ready to improve reliability when discrepancies are detected.
Data Source
AI summary
An object of the invention is to provide a vehicle-mounted information processing apparatus capable of specifying the position of another vehicle with high accuracy using information related to the distance between another vehicle and an intersection point. The vehicle-mounted information processing apparatus includes: a map information storage unit (11) that stores map information including position information of a road and an intersection point; an inter-vehicle communication unit (4) that acquires various kinds of information using inter-vehicle communication with another vehicle; an another-vehicle GPS information acquiring unit (13) that acquires GPS information related to the position of another vehicle and acquires first reference intersection point distance information related to a distance between another vehicle and a first reference intersection point which is recognized by another vehicle as an intersection point that is in front of another vehicle and is closest to another vehicle, through the inter-vehicle communication unit (4); and an another-vehicle position specifying unit (16) that specifies the position of another vehicle on the basis of the GPS information, the map information, and the first reference intersection point distance information.