Simultaneous Calibration of Motion Capture Sensors
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Solution Overview
Problem
Existing motion capture sensors face limitations in accuracy due to high calibration costs and manufacturing processes, which often result in incomplete or skipped calibration, especially for multiple sensors mounted on large PCBs in devices like mobile phones, where high accuracy is not required for simple applications.
Innovation Solution
A calibration system that enables simultaneous calibration of multiple motion capture elements using a rotational plate or Stewart platform, allowing for simultaneous calibration of multiple sensors across all axes, reducing costs and increasing accuracy by calculating a 3x3 calibration matrix for each sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single motion capture element is calibrated using known calibration machines, then calibration accuracy is improved, but calibration time and cost increase significantly when multiple sensors need to be calibrated
Solution Approach 1:
The patent combines multiple motion capture sensor calibration operations into a single calibration machine. The machine can hold and calibrate multiple sensors simultaneously through integrated mounting structures and rotation mechanisms, allowing parallel calibration of multiple devices rather than sequential calibration of each individual sensor.
Solution Approach 2:
The calibration machine is designed with universal mounting capabilities that can accommodate different types and formats of motion capture sensors. The system provides multi-functional calibration capabilities for various sensor orientations and configurations, making it applicable to diverse sensor types while maintaining calibration accuracy.
2Measurement precision
If calibration is performed for each motion capture element individually, then calibration accuracy is maintained, but manufacturing cost increases due to extended calibration time
Solution Approach 1:
The calibration machine merges multiple calibration operations into a single integrated system. By accommodating multiple sensors simultaneously and providing rotation mechanisms for comprehensive axis calibration, the system reduces total calibration time and associated costs while maintaining individual sensor calibration accuracy through dedicated mounting and measurement capabilities.
3Adaptability or versatility
If motion capture sensors are mounted on large PCBs in devices like mobile phones, then device integration is improved, but calibration becomes more difficult and expensive due to the need to calibrate multiple sensors simultaneously
Solution Approach 1:
The calibration machine provides universal mounting capabilities that can accommodate sensors in various configurations, including those mounted on PCBs of different sizes. The system can hold multiple sensors simultaneously and provides rotation mechanisms that enable comprehensive calibration of all sensor axes regardless of their mounting configuration, simplifying the calibration process for integrated devices.
Data Source
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AI summary
A calibration system for simultaneous calibration of multiple motion capture elements (MCEs) of at least one type (accelerometer and/or gyroscope). Includes motion and/or rotational element coupled to a base and configured to move and/or rotate multiple MCEs mounted on a mount in and/or about at least one axis. For one axis movement embodiments, after each motion and/or axial rotation, the motion and/or rotational mount itself is rotated for example manually, so the mount points in a different direction, i.e., the Z axis. In a single axis embodiment, this is performed twice so that each axis of the MCEs experience motion and/or rotation about three axes. The motion capture data is sampled and used in calculation of a 3 X 3 calibration matrix. The physical format of the motion capture sensors may be any format including chip, memory or SIM card format, PCB format, mobile computers/phones.