Calibration Effectiveness Verification of a Magnetometer Linear Calibration Method During Gait Movement

With the increasing demand for human motion monitoring in daily life, it puts forward higher requirements for the efficiency and accuracy of the calibration method of inertial measurement units. We previously proposed an inclination-based magnetometer linear calibration (I-Calibration) method, which eliminates the need for high-precision turntable and calculation process does not need to converge. The effectiveness of the I-Calibration method applied in the designed 12-observation scheme has been verified, but the effectiveness in indoor multi-interference environment during human movement are still needed to verify. Therefore, this paper designed a series gait movement experiment in an indoor environment as the sensors are placed on the knee and ankle joint of the participant. The results demonstrated that the I -Calibration can effectively calibrate the magnetometers during straight round trip and square path, as the findings in this study expands the application range and application scenarios of the I-Calibration method and the applications of the inertial measurement units in daily life for human motion monitoring.