Traffic Information Collection with GPS-DR Map Matching
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Solution Overview
Problem
Existing systems face challenges in providing accurate traffic information due to mismatched GPS data and insufficient probe vehicles, leading to poor accuracy in route optimization.
Innovation Solution
A system and method utilizing a vehicle with sensors for dead reckoning and GPS, generating map matching information, and a server that weights and collects this information based on software version and update status to ensure accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of probe vehicles is increased to improve traffic information accuracy, then measurement precision improves, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent segments the traffic information collection process into two distinct data sources: GPS information from terminals and dead reckoning information from probe vehicles. This segmentation allows the system to utilize multiple independent data streams, improving overall measurement precision without requiring a single complex centralized system. The server processes these segmented data sources separately and integrates them for route calculation.
Solution Approach 2:
The patent implements multi-functionality by enabling the traffic information system to operate with different configurations based on availability. The server can process traffic information using GPS data alone, dead reckoning data alone, or both combined. This universal approach allows the system to maintain functionality and improve accuracy without requiring all components (probe vehicles) to be present, thus reducing implementation complexity.
2Measurement precision
If map information is not updated, then device complexity is reduced, but measurement precision of GPS information deteriorates
Solution Approach 1:
The patent introduces dead reckoning information as an intermediary element that bridges the gap between GPS data and map information. When GPS information does not match current map data, the dead reckoning data serves as a mediator to estimate the vehicle's position based on its movement from a known previous location. This intermediary approach maintains measurement precision without requiring constant map updates, thus avoiding the complexity of frequent data synchronization.
Solution Approach 2:
The system performs preliminary action by pre-calculating and storing dead reckoning information based on vehicle sensor data (accelerometer, gyroscope, odometer) before GPS matching is needed. This preliminary preparation of position estimation data allows the system to quickly compensate for GPS-map mismatches without requiring real-time map updates, maintaining accuracy while reducing the complexity of continuous data synchronization.
Data Source
AI summary
A system for collecting traffic information includes a vehicle having at least one sensor for collecting dead reckoning (DR) information, and a global positioning system (GPS) receiver configured to receive GPS information, and a server that maps the DR information and the GPS information to a server map to generate first map matching information, and collects the first map matching information as the traffic information when it is determined that a version of a software platform of the vehicle is a latest version and all the DR information and the GPS information are received.