Vehicle Localization Using Mobile Map Data in Poor Signal Zones
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Solution Overview
Problem
The existing Emergency Call (eCall) system struggles to accurately determine a vehicle's location in areas with poor satellite signal reception, such as tunnels or underpasses, due to increased errors in Dead Reckoning values when satellite signals are not received.
Innovation Solution
A vehicle localization system that utilizes a mobile terminal to provide map information for correcting the vehicle's location, including road attributes, starting and ending locations, and road gradients, to accurately determine the vehicle's position in poor reception zones by distinguishing between reception-disturbance and shadow regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the eCall system relies on Dead Reckoning (DR) value to determine vehicle location in satellite signal poor reception regions, then the system can provide location information in tunnels and underpasses, but the location accuracy deteriorates as the time without satellite signal increases
Solution Approach 1:
The patent introduces map information as an intermediary element to mediate between the vehicle terminal and the location determination process. The map information, stored in the mobile terminal, serves as a reference framework that corrects the DR-based location estimates, reducing cumulative errors without requiring direct satellite signal reception in poor reception regions
Solution Approach 2:
The system implements a feedback mechanism where the mobile terminal continuously provides map-matched location corrections to the vehicle terminal. This feedback loop allows the system to compensate for DR drift by comparing estimated positions against known map geometry, thereby maintaining location accuracy over extended periods in satellite-denied environments
2Measurement precision
If the eCall system uses satellite signal for location determination, then high location accuracy is achieved in open areas, but the system fails to provide reliable location information in poor reception quality regions such as tunnels and underpasses
Solution Approach 1:
The patent implements a dynamic location determination system that automatically switches between satellite-based positioning and map-matched DR-based positioning based on signal availability. The system adapts its methodology in real-time, using high-precision satellite data when available and transitioning to map-corrected DR estimates when satellite signals are obscured, ensuring continuous reliable operation across diverse environmental conditions
Data Source
AI summary
The present disclosure relates to a system and a method for localizing a vehicle. A vehicle terminal acquires location information of a vehicle and transmits the acquired location information to the mobile terminal, then determines whether the vehicle enters a poor reception quality zone where a reception of a satellite signal is poor. Then, the vehicle terminal, when the vehicle enters the poor reception quality zone, receives map information of the poor reception quality zone transmitted from the mobile terminal, and corrects a current location of the vehicle using the map information of the poor reception quality zone.