Software calibration for AK8963 magnetometer based on optimal ellipsoidal fitting

Abstract

<p>With the rapid development of mechatronics, systems in package (SiP), in particular the MPU-9250 inertial measurement Unit 9DOF (MPU-6050 6DOF and AK8963 3DOF), are becoming ubiquitous in applications for autonomous navigation purposes. Nevertheless, they suffer from some accuracy problems related to axis misalignment, disturbances, and deviation over time that make them unable to work autonomously for a long time. This paper will present a simple and practical calibration method using a least-squares based ellipsoid fitting method to calibrate and compensate for the error interference of the AK8963 sensor. Towards the end of this paper, a comparison between before and after the calibration is presented to study the software compensation effect and the stability of the magnetic sensor under study.</p>

Prototype of landslide detection alarm based on IoT (Internet of Things) as a physics learning medium

“…The GY-9250 Sensor Module is a breakout board for the InvenSense MPU-9250 9-Axis IMU (Inertial Measurement Unit). The MPU-9250 combines a 3-axis accelerometer, a 3-axis gyroscope, and a 3-axis magnetometer in a single chip, providing 16-bit resolution for each of the 9 axes, low power consumption, and additional I2C pins for reading data from external sensors (El fatimi et al, 2023).…”