In order to measure heading angle accurately and intelligently in strong magnetic perturbed environment

analyze numerous factors which influence heading angle measurement precision of magnetic sensor

and present use classic calibration algorithm based on ellipse fitting

and design a multiple magnetic sensor auto calibration device

which composed of six magnetic sensors form a circle. Present an effective error compensation technology and accurate and intelligent method for heading anglemeasurement

which avoids manual operation rotating of a single magnetic sensor to collect magnetic field in different directions. The intelligent heading measuring system is tested repeatedly and verified in strong magnetic perturbed environment

this calibration technology reduces the original heading error from 150° to 2. 5°.