Sensor Fusion Location Tracking with Bluetooth Angle Correction
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Solution Overview
Problem
Head-mounted devices face challenges in accurately determining their location and orientation due to error accumulation over time from sensor data, particularly from accelerometers and gyroscopes, which can lead to positional drift and inaccuracies.
Innovation Solution
The implementation of Bluetooth transceivers with angle-based location finding techniques, utilizing the angle of arrival and angle of departure capabilities, in conjunction with sensors and cameras, to supplement and correct position and orientation data, ensuring more precise location determination for head-mounted devices and associated auxiliary devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If sensor data from accelerometers and gyroscopes is used for location determination, then the device can obtain location information continuously, but error accumulation occurs over time leading to positional drift
Solution Approach 1:
The patent combines multiple location determination techniques (sensor fusion from accelerometers/gyroscopes, Bluetooth angle-based location finding, and camera-based tracking) into a unified system. This merging allows the system to leverage the continuous tracking capability of sensors while periodically correcting drift using Bluetooth and camera data, thereby maintaining both continuous operation and high accuracy over time.
Solution Approach 2:
The system implements feedback mechanisms where location data from multiple sources is continuously monitored and compared. When drift is detected through cross-validation between sensor data and Bluetooth/camera-based location determination, the system adjusts and corrects the sensor readings, creating a closed-loop feedback system that maintains accuracy while preserving continuous tracking capability.
2Measurement precision
If Bluetooth angle-based location finding is used to correct position data, then measurement precision is improved, but the system complexity increases
Solution Approach 1:
The patent introduces Bluetooth transceivers as intermediary devices that facilitate angle-based location finding. These intermediaries enable accurate location determination without requiring complex direct measurements between all device components. The Bluetooth system acts as a mediator that provides reference points for correcting sensor drift, simplifying the overall architecture while maintaining high precision.
3Productivity
If frequent sensor updates are performed to maintain continuous tracking, then productivity is improved, but error accumulation increases
Solution Approach 1:
The system implements periodic correction cycles where high-frequency sensor updates continue for continuous tracking, but at regular intervals, the system performs correction using Bluetooth angle-based location finding and camera data. This periodic action maintains high productivity through frequent updates while periodically resetting error accumulation, thereby preserving both tracking frequency and location reliability.
Data Source
AI summary
Disclosed herein are techniques for obtaining location data for a sensor fusion device. The techniques include transmitting or receiving a signal from or to the sensor fusion device. The techniques also include obtaining angle-based location data, based on the signal and on an angle-based location finding technique. The techniques also include determining location data for the sensor fusion device or an auxiliary device associated with the sensor fusion device, based on the angle-based location data.