Full digital electronic compass is developed by using magnetic-inductive sensors and acceleration sensors and the error-separation method based on non-magnetic three-axis rotation platform is presented to calibrate the magnetic compass. The parameters about misalignment and non-orthogonality of the sensor axes and the response curve of sensor output to earth magnetic intensity are obtained. Furtherly

the sensitivity of magnetometers and the bias from the offset and hard-iron interference are estimated according to the response curve. The independent effect of non-orthogonality and misalignment

bias and inconsistence in sensitivity on the heading error can be evaluated with the error-separation method

respectively. After calibration

the maximum heading error of magnetic compass is about 0. 4° when both pitch angle and roll angle are in the range of 60°

indicating the error-separation method is effective and efficient to calibrate electronic compasses.