Vehicle Navigation System Shaded Area Detection
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Solution Overview
Problem
Existing vehicle navigation systems often provide erroneous navigation instructions when they fail to account for vehicles being on elevated roadways or in tunnels, leading to delayed recognition of signal shading errors.
Innovation Solution
A method that compares GPS-based and inertial sensor-based position determinations to detect deviations indicative of shaded areas, using road data networks to identify and associate vehicle positions with elevated roadways or tunnels, thereby improving navigation precision and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the navigation system uses only GPS signals for position determination, then the system is simple and uses minimal sensors, but the navigation provides erroneous instructions when the vehicle is in shaded areas such as tunnels or elevated roadways
Solution Approach 1:
The system performs preliminary comparison between GPS-based and inertial sensor-based position determinations continuously. When a deviation exceeding a threshold is detected, the system proactively switches to inertial sensor data before GPS signal loss becomes complete, enabling early recognition of shaded areas and prevention of erroneous navigation instructions.
Solution Approach 2:
The inertial sensor system acts as an intermediary backup mechanism. When GPS signals are degraded or lost in shaded areas, the inertial sensors provide continuous position determination based on vehicle movement characteristics, bridging the gap between GPS signal availability and navigation reliability.
2Loss of time
If the navigation system switches to inertial sensor data only when GPS signal is completely lost, then the system remains simple to operate, but the recognition of shaded areas is delayed and navigation errors occur
Solution Approach 1:
The system continuously compares GPS and inertial sensor position determinations and switches to inertial sensor data as soon as a significant deviation is detected, rather than waiting for complete GPS signal loss. This preliminary action reduces the response time for shaded area recognition and prevents navigation errors before they occur.
3Measurement precision
If the navigation system uses inertial sensors for continuous position determination, then the system can recognize shaded areas early, but the device complexity and sensor requirements increase
Solution Approach 1:
The system uses inertial sensors not for continuous primary navigation, but as a supplemental verification mechanism. The inertial sensors are activated only when GPS position determination shows deviations exceeding a threshold, providing partial coverage that enhances precision without requiring full-time inertial sensor operation, thus balancing measurement precision with device complexity.
Data Source
AI summary
A method for operating a navigation device. The navigation device carries out a position determination on the basis of received signals. In parallel, another position determination is carried out on the basis of signals from inertial sensors. These two determined positions are compared. If these two determined positions differ by more than a predetermined amount, which has been defined by a predetermined limit value, an error value is recognized. If an impermissible deviation is recognized, then especially the direction of movement, the speed differences and the position changes are taken into account. When the error value is recognized, shaded areas in the surroundings of the vehicle are determined and associated with the determined momentary position, as a result of which an association with a lane level is carried out.