Gilbert, TJ;
Day, S;
de C Hamilton, AF;
Ward, JA;
(2022)
A Simple Method for Synchronising Multiple IMUs using the Magnetometer.
In:
Proceedings of the 2022 ACM International Symposium on Wearable Computers.
(pp. pp. 100-102).
Association for Computing Machinery (ACM)
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Abstract
This paper presents a novel method to synchronise multiple IMU (inertial measurement units) devices using their onboard magnetometers. The method described uses an external electromagnetic pulse to create a known event measured by the magnetometer of multiple IMUs and in turn used to synchronise these devices. The method is applied to 4 IMU devices decreasing their de-synchronisation from 270ms when using only the RTC (real time clock) to 40ms over a 1 hour recording. It is proposed that this can be further improved to approximately 3ms by increasing the magnetometer's sample frequency from 25Hz to 300Hz.
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