Research On Electromagnetic Positioning System Based On Phase Resolution

One of the key challenges in enhancing the performance of electromagnetic (EM) positioning systems today is to significantly improve the positioning speed while keeping the number of magnetic field sources and sensors unchanged. To tackle this challenge, this paper proposes a phase-resolution-based EM positioning method and validates its efficacy through simulation. The magnetic positioning system comprises two magnetic field sources, each consisting of three-axis orthogonal coils, and three-axis magnetic sensors serving as positioning targets. By exciting the two magnetic field sources with two different frequencies of constant current AC signals, two rotation angles are simultaneously measured using the phase resolution method. Consequently, two sets of rotation angles required for positioning can be obtained through the two excitations. The simulation results obtained through finite element modeling demonstrate that the system exhibits an average position error of 0.20±0.00 cm. Furthermore, the system achieves a remarkable positioning speed of 1.5 ms when subjected to excitation signals of 1 kHz and 2 kHz. These results showcase that the phase-resolved electromagnetic positioning system possesses high positioning speed, accuracy, and stability. With further optimization, it can effectively meet the application requirements of various scenarios. Therefore, it holds great potential for further enhancements to cater to diverse applications.