Magnetic dipole model calibration method based on polynomial expansion

The invention relates to the technical field of electromagnetic positioning, in particular to a magnetic dipole model calibration method based on polynomial expansion. According to the calibration method, a magnetic dipole model is established between a three-axis induction coil and a single-axis transmitting coil, and the magnetic field intensity of the magnetic dipole model is calculated; polynomial expansion is carried out on an induction electric signal of the induction coil, so that the magnetic field intensity error calculated by the induction electric signal and the magnetic dipole model is minimum; and calculating to obtain a rotation matrix of the three-axis induction coil, so that the magnetic fields of the three-axis induction coil are mutually orthogonal. According to the method, polynomial expansion is carried out on the electric induction signal of the induction coil, so that the electric induction signal and the magnetic field calculated by the magnetic dipole are mutually fitted, meanwhile, th