Location Accuracy Validation Using Inertial Sensor Data
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Solution Overview
Problem
Satellite navigation sensors, such as GPS receivers, often underestimate location errors due to interference and distortion in urban areas, leading to overconfident accuracy measures that can affect the reliability of location-based services.
Innovation Solution
A location detection system that uses data from a satellite navigation sensor in conjunction with a second sensor, like an inertial measurement unit (IMU), to determine the accuracy of location estimates by performing a dead reckoning process and comparing travel measurements to ensure the accuracy of the satellite navigation data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If satellite navigation sensors are used to provide location estimates, then location-based services can operate, but the accuracy measures reported tend to be overconfident and underestimate actual errors
Solution Approach 1:
The patent introduces a second sensor (such as an IMU or other positioning sensor) as an intermediary to validate the satellite navigation sensor's accuracy claims. This mediator provides independent measurements that can confirm or refute the reported accuracy, resolving the overconfidence problem without replacing the original positioning system.
Solution Approach 2:
The system implements feedback by using the second sensor to monitor and validate the accuracy measures reported by the satellite navigation sensor. This closed-loop validation provides continuous feedback on the reliability of location estimates, allowing the system to adjust its confidence in the reported accuracy based on actual performance observation.
2Measurement precision
If a second sensor is added to validate location accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent leverages the fact that mobile devices already contain multiple sensors (accelerometers, gyroscopes, other positioning sensors) for other functions. By repurposing these existing multi-functional sensors for accuracy validation, the system improves measurement precision without significantly increasing device complexity, as the sensors serve multiple purposes.
Data Source
AI summary
A location detection system performs a process that uses data from a satellite navigation sensor in conjunction with data from a second sensor to determine the accuracy of location estimates provided by the satellite navigation sensor. The system uses the satellite navigation sensor to determine location estimates from at a first time and a second time. The system also uses data from the second sensor to determine a third location estimate, which represents another estimate of the system's location at the second time. The system uses the three location estimates to determine whether the second location estimate satisfies an accuracy condition. If the accuracy condition is satisfied, then the second location estimate may be provided as input to a process.