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Calculation of the vaulted magnetic field over a ship based on magnetic dipole equivalence

At present, the calculation of ship magnetic field is based on the plane distance, and there is no good method to calculate the plane magnetic field of the vault above the actual cavern. In order to calculate the vault magnetic field to the plane magnetic field, the data of the plane magnetic field at different heights above the vault were obtained. Based on the equivalent source theory, the magnetic field is modeled and analyzed by using the magnetic dipole equivalent ship magnetic field. Using magnetic dipole equivalence can effectively solve the problem that the number of sensors in the vault is small and the height is non-planar. Simulation and ship model experiments show that the magnetic dipole equivalent effect method has higher accuracy, and the calculated values are in good agreement with the measured values. The relative root mean square error is small and it can be used in practical engineering calculation.