Steering difference calibration method for self-balancing vector magnetometer in large-plane magnetic measurement system

The invention relates to a steering difference calibration method for a self-balancing vector magnetometer in a large-plane magnetic measurement system, and the method comprises the steps: arranging the self-balancing vector magnetometer and a probe thereof on a fixed platform, and laying hardware; the fixed platform is moved in an all-dimensional attitude conversion mode, 360-degree dead-angle-free rotation actions of the self-balancing vector magnetometer and the probe of the self-balancing vector magnetometer at the roll angle, the pitch angle and the course angle are completed, and corresponding magnetic field data are obtained; and performing steering difference calibration on the self-balancing vector magnetometer based on the magnetic field data. The steering difference error of the self-balancing vector magnetometer is solved in a targeted mode, the actual magnetic field value of the omni-directional vector space is obtained, steering difference calibration is conducted on the actual magnetic field va