Correction of Non-orthogonal Error of Triaxial Magnetic Sensor Based on L-SHADE

The triaxial magnetic sensor is widely used in the field of magnetic field measurement, but the triaxial orthogonality is difficult to measure, which directly affects the accuracy of magnetic measurement. In this paper, a correction method for the non-orthogonal error of the triaxial magnetic sensor based on L-SHADE algorithm is proposed. According to the measurement principle of the triaxial magnetic sensor, the conversion matrix of magnetic field coordinates under nonideal conditions and under ideal conditions is obtained. According to this, the target optimization function for the non-orthogonal error under the known and unknown geomagnetic fields is established respectively. The non-orthogonal error correction parameters are obtained by using optimization algorithm. The magnetic measurement simulation and experimental correction results of the triaxial magnetic sensor show that the proposed method can reduce the maximum root-mean-square error from 66.6nT to 8.1nT when the geomagnetic field is not accurately obtained, which has certain reference value for the correction of non-orthogonal error.