Motion Measurement Method for Dual Magnetic Dipole of Different Frequencies

A real-time measurement method of the motion of a dual-alternating magnetic dipole radiation source with different frequencies is proposed in this paper. Based on the accurate estimation method of the parameters of the dual-frequency signal, the magnetic field intensity of each magnetic dipole is calculated. According to the linear relationship between the magnetic field of the magnetic dipole and its gradient tensor, the spatial coordinates of the magnetic dipole are calculated, so as to achieve continuous motion measurement. In this paper, the method is derived, and the motion measurement test is carried out by using the measured data. The results show that the method can get accurate measurement results under proper conditions. The calculation of the method is simple, the real-time performance is great, and it has a good engineering application value.