A Simple Method for Synchronising Multiple IMUs using the Magnetometer

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.

Automated summary

This paper presents a novel method to synchronise multiple IMU devices using their onboard magnetometers. By creating a known event using an external electromagnetic pulse and utilizing the magnetometer measurements, the devices can be synchronised effectively. Experimental results show a significant decrease in desynchronisation time for the IMU devices.