High-precision simulation and measurement of the aerial magnetic field in the near-area of underwater conventional electrode-type source

Abstract The two-electrode straight open magnetic source (TSOMS) has been widely used in magnetic minesweepers and decoys. Achieving high-precision simulation of the near area magnetic field is crucial for its precise location. In this paper, we discuss the influence of the number of subdivision units on the calculation accuracy and time of the magnetic field of the TSOMS (MFTSOMS). The multiple electric dipole magnetic field (EDMF) accumulation method is combined with the 12-point Gaussian integral method to improve the precision of the near-area EDMF. We propose to use the EDMF algorithm (the frequency is infinitesimal) to verify the correctness of the MFTSOMS algorithm (DC). Our results show that both calculation accuracy (relative accuracy) and efficiency of the MFTSOMS can be taken into account when the subdivision unit number is 10 3 to 2 × 10 5 and must be larger than 10 l / S . We also find that the two algorithms agree well in the near and far areas when the length of the line electrode is infinitely small. Finally, we conduct a pool experiment to validate the effectiveness of the MFTSOMS algorithm.