Vehicle Positioning via Mobile Terminal Self-Localization
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Solution Overview
Problem
In urban areas with high building densities and tunnels, GPS/GNSS self-localization of motor vehicles is hindered by shadowing and multi-path effects, leading to inaccurate vehicle positioning, which existing methods like dead reckoning cannot fully address.
Innovation Solution
A method that utilizes a mobile terminal's self-localization capabilities, independent of satellite signals, by integrating a mobile terminal with the vehicle's navigation system through a dedicated interface to enhance positioning accuracy, particularly using WLAN-based self-localization, and selectively incorporating satellite signals for improved vehicle positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS/GNSS is used for vehicle positioning, then positioning accuracy is improved in open areas, but positioning reliability deteriorates in urban areas with high building densities, tunnels, and parking garages due to shadowing and multi-path effects
Solution Approach 1:
The patent combines GPS/GNSS positioning with WLAN-based positioning and dead reckoning methods into a unified navigation system. The mobile terminal integrates multiple positioning technologies, selecting and combining results based on current environmental conditions to maintain both accuracy and reliability across different scenarios
Solution Approach 2:
The system dynamically changes positioning parameters by switching between different positioning methods (GPS/GNSS, WLAN, dead reckoning) based on signal availability and environmental conditions. When GPS/GNSS reliability drops in urban canyons or tunnels, the system transitions to alternative positioning parameters and methods
2Duration of action of stationary object
If dead reckoning is used to update vehicle position when GPS/GNSS fails, then positioning continuity is improved, but positioning accuracy deteriorates over time and in complex scenarios such as multiple street levels or parallel streets
Solution Approach 1:
The mobile terminal acts as an intermediary between GPS/GNSS and the navigation system. It continuously monitors GPS/GNSS signal quality and switches to WLAN or dead reckoning methods when GPS/GNSS becomes unreliable, preventing accuracy deterioration while maintaining positioning continuity
Solution Approach 2:
The system implements feedback mechanisms where the mobile terminal continuously evaluates positioning quality from different sources and adjusts the weighting and selection of positioning methods accordingly, ensuring optimal accuracy while maintaining continuity
3Adaptability or versatility
If a navigation system fixedly installed in the motor vehicle is used, then vehicle integration is improved, but positioning reliability deteriorates in GPS/GNSS failure scenarios
Solution Approach 1:
The navigation system is designed with multi-functionality by integrating multiple positioning technologies (GPS/GNSS, WLAN, dead reckoning) within a single system. This universal approach allows the system to adapt to different environments and maintain reliability across various scenarios
Data Source
AI summary
A method of determining the own-vehicle position of a motor vehicle having a navigation system fixedly installed in the motor vehicle includes the steps of: providing a mobile terminal having the suitability for self-localization; providing an interface for the communication-related link-up of the mobile terminal to the motor vehicle; determining the own-terminal position of the mobile terminal by self-localization; transmitting the own-terminal position by way of the interface to the motor vehicle; and taking into account the transmitted own-terminal position when determining the own-vehicle position.