The magcal function can give calibration parameters to correct hard and soft iron offsets in a magnetometer. Calling the function with no option string, or equivalently the 'auto' option string, produces the best fit and covers most cases.
I will use an Arduino to read magnetometer data from an I2C sensor, transmit it over serial to a PC, log the data to a text file, and generate calibration parameters with a software named Magneto.
Of all the sensors that need calibration, magnetometers are the most essential to calibrate! Unless you're detecting strong magnets, there's no way for a magnetometer to work unless you perform a hard iron offset calculation.
This guide will walk you through the process of performing 3 types of calibration for a magnetometer: hard-iron calibration, soft-iron calibration, and magnetic declination.
Using a fully calibrated inertial measurement unit (IMU), such as the ADIS16480 or ADIS16488, helps address sensor accuracy, but optimal system performance still requires consideration of environmental threats.
It is possible to eliminate the effects of both hard and soft iron distortions on the magnetometer outputs through the use of a hard and soft iron (HSI) calibration. An HSI calibration is a method used to map the biased and distorted ellipsoid back into a sphere centered at the origin.
Magnetometercalibration is a process to correct for the environmental impact on the magnetometer. This is important because the magnetometer is sensitive to magnetic fields, and even small changes in the environment can affect its readings.
Calibration procedures for a number of different detection coil designs and their mathematical foundations are addressed. Many of these procedures can be applied to a wide variety of magnetic measurement technologies.
Choosing the appropriate calibration method ensures that your magnetometer provides reliable and accurate measurements. Explore the most common magnetometercalibration techniques, from basic offset corrections to advanced machine-learning-based solutions.
