Mobile Device Positioning Correction Using Sensor and Map Data
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Solution Overview
Problem
Existing indoor vehicle positioning systems face challenges such as high maintenance costs, limited applicability, and positioning time lags due to the need for dense radio signal coverage, and inertial navigation systems suffer from sensor bias and error accumulation over time.
Innovation Solution
A positioning method for mobile devices that determines a speed reference value and position reference value based on sensor data and preset map data to correct estimated speed and positioning values, improving precision without relying on dense radio signal coverage or error-prone inertial navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radio signal positioning technology is used to determine position through triangulation or fingerprint matching, then positioning can be achieved in indoor environments, but dense infrastructure installation is required and maintenance costs are high
Solution Approach 1:
The patent replaces the radio signal-based positioning system with an inertial navigation system using accelerometers and gyroscopes. This substitution eliminates the need for dense wireless access point infrastructure and fingerprint databases, while maintaining positioning capability through dead reckoning based on sensor measurements of acceleration and rotation.
Solution Approach 2:
The inertial navigation system is self-contained and does not require external infrastructure. The mobile device uses its own onboard sensors (accelerometer, gyroscope) to autonomously calculate position, speed, and orientation through integration of motion data, making the system independent of external radio signal coverage.
2Device complexity
If inertial navigation technology is used to calculate position through dead reckoning, then positioning can be achieved without dense infrastructure, but positioning error accumulates over time
Solution Approach 1:
The patent implements a feedback mechanism where the mobile device continuously monitors its position using both inertial navigation and available radio signal positioning. When radio positioning data is available, it is used to correct and reset the accumulated inertial navigation errors, thereby maintaining long-term accuracy without requiring dense infrastructure.
Solution Approach 2:
The patent merges inertial navigation and radio signal positioning into a hybrid system. The inertial navigation provides continuous positioning data independent of infrastructure, while radio signal positioning is used periodically to correct drift and reset error accumulation, combining the advantages of both approaches.
3Measurement precision
If integrated positioning system combining inertial navigation and radio signal positioning is used, then error accumulation in inertial navigation is corrected, but the system remains dependent on dense radio signal coverage
Solution Approach 1:
The patent dynamically adjusts the reliance on different positioning methods based on availability. When radio signal coverage is dense, the system uses radio positioning to correct inertial errors. When radio coverage is sparse or unavailable, the system transitions to pure inertial navigation, maintaining functionality across varying environmental conditions without requiring consistent dense coverage.
Data Source
AI summary
A positioning method applied to a mobile device having a sensor system and a positioning system includes determining that the mobile device is in a preset state; determining a speed reference value of the mobile device based on data detected by the sensor system; determining a position reference value of the mobile device based on preset map data and an estimated positioning value that is output by the positioning system; and correcting, based on the speed reference value and the position reference value, an estimated speed value and the estimated positioning value that are output by the positioning system.