Synchronisation of wearable inertial measurement units based on magnetometer data.

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-06-27 DOI:10.1515/bmt-2021-0329

Andreas Spilz, Michael Munz

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引用次数: 0

Abstract

Objectives: 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.

Methods: 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.

Results: The proposed technique shows to be able to synchronise with a maximum offset of below 2.6 ms with sensors measuring at 100 Hz. The investigated parameters suggest a required synchronisation time of 8 s.

Conclusions: The results indicate a reliable event generation and detection for synchronisation of wireless inertial measurement units. 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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基于磁强计数据的可穿戴惯性测量装置同步。

目的:在人体运动分析中，无线惯性测量单元的同步通常使用基于事件的同步技术来实现。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，从而导致错误的分析输出。方法:我们提出了一种基于磁场的新的基于事件的同步技术，该技术允许子样本精度。设计了一个具有Shimmer3惯性测量单元的装置来测试该方法。结果:所提出的技术表明，能够与传感器在100 Hz测量的最大偏移量低于2.6 ms同步。所调查的参数表明所需的同步时间为8秒。结论:结果表明，无线惯性测量单元的同步可靠的事件产生和检测。进一步的研究应探讨传感器在人体运动分析过程中所暴露的温度变化及其对传感器内部时间测量的影响。此外，该方法应使用来自不同制造商的惯性测量单元进行测试，以研究精度测量中确定的常数偏移。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.