Proactive Digital Map Update System for Vehicle Navigation
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Solution Overview
Problem
Current digital map updates in vehicles are inefficient due to the need for constant data refreshes, which result in large volumes of data being exchanged and inaccuracies in positioning caused by measurement errors and map tolerances, leading to potential navigation errors.
Innovation Solution
A proactive update system for vehicles that identifies and updates only the specific portions of the digital map required for travel routes, allowing for reduced data transmission and alignment with actual vehicle positions, using a system control center to manage and filter updates based on user inputs and route changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the whole map is updated to ensure current and accurate navigation information, then the map accuracy and reliability are improved, but the data transmission volume and update complexity increase significantly
Solution Approach 1:
The patent divides the digital map into multiple regions or zones. Instead of updating the entire map, only the specific regions that are relevant to the user's current location and planned route are updated. This segmentation allows the system to maintain map accuracy for necessary areas while significantly reducing the overall data transmission volume.
Solution Approach 2:
The patent extracts and updates only the necessary portions of the map data that are relevant to the user's navigation needs. By identifying and separating the required map sections from the complete map dataset, the system transmits only the essential updates, thereby reducing data volume while maintaining accuracy where it matters.
2Reliability
If frequent map updates are performed to maintain current navigation data, then the map currency and reliability are improved, but the loss of time and energy increase due to constant data exchange
Solution Approach 1:
The patent performs preliminary identification of which map regions will be needed based on the user's current location and planned route. By determining the required map sections in advance, the system can prepare and transmit updates proactively, reducing the need for frequent reactive updates and minimizing time loss.
Solution Approach 2:
Instead of continuous or frequent updates, the patent implements periodic updates only for the specific map regions that are relevant to the user's navigation. This periodic action is triggered by changes in user location or route planning, thereby maintaining map currency without the time penalty of constant data exchange.
3Device complexity
If the measured position is directly mapped to the coordinate system without alignment, then the device complexity is reduced, but the measurement precision and navigation accuracy deteriorate due to position errors
Solution Approach 1:
The patent introduces map matching technology as an intermediary process between the raw GPS position measurement and the final navigation display. This intermediary aligns the measured position with the map coordinate system by considering road network geometry and vehicle movement patterns, thereby improving position accuracy without significantly increasing overall system complexity.
Solution Approach 2:
The patent employs feedback mechanisms where the system continuously compares the measured position with expected positions based on map data and vehicle movement. This feedback loop allows the system to correct positioning errors by aligning the measured position with the most probable location on the road network, improving measurement precision through iterative refinement.
Data Source
AI summary
A navigation unit for a vehicle for updating a navigation map is specified, wherein the navigation unit is configured to proactively ascertain a required portion of the map and is also configured to receive a restricted update for the map which relates to the required portion of the map.