基于磁力计的可穿戴 IMU 同步新方法
Novel Approach To Synchronisation Of Wearable IMUs Based On Magnetometers
AI总结：
提出一种基于磁场的无线惯性测量单元事件同步新方法，实现亚采样精度，在 100 Hz 采样下最大偏移低于 2.6 ms，有效提升了人体运动分析的同步准确性。
摘要：
在人体运动分析中，无线惯性测量单元的同步通常采用基于事件的同步技术。然而，这些技术缺乏精确的事件生成和准确性。不准确的同步可能导致运动估计和重建中的大误差，从而产生错误的分析结果。我们提出了一种基于磁场的新型事件同步技术，该技术可实现亚采样精度。设计了一个包含 Shimmer3 惯性测量单元的实验装置来测试该方法。结果表明，该技术能够在传感器以 100 Hz 频率测量时，实现低于 2.6 ms 的最大偏移量进行同步。此外，结果还表明事件生成和检测是可靠的。所研究的参数表明需要 8 秒的同步时间。未来的研究应探讨传感器在人体运动分析期间所经历的温度变化及其对传感器内部时间测量的影响。另外，应使用不同制造商的惯性测量单元来测试该方法，以调查在精度测量中发现的恒定偏移。
英文摘要：
Synchronisation of wireless inertial measurement units in human movement analysis is often achieved using event-based synchronisation techniques. However, these techniques lack precise event generation and accuracy. An inaccurate synchronisation could lead to large errors in motion estimation and reconstruction and therefore wrong analysis outputs. We propose a novel event-based synchronisation technique based on a magnetic field, which allows sub-sample accuracy. A setup featuring Shimmer3 inertial measurement units is designed to test the approach. The proposed technique shows to be able to synchronise with a maximum offset of below 2.6~ms with sensors measuring at 100~Hz. Also, the results indicate a reliable event generation and detection. The investigated parameters suggest a required synchronisation time of eight seconds. Further research should investigate the temperature changes that the sensors are exposed to during human motion analysis and their influence on the internal time measurement of the sensors. In addition, the approach should be tested using inertial measurement units from different manufacturers to investigate an identified constant offset in the accuracy measurements.
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