Based on the steady current field model of the point electrode in the three-layers media (air-seawater-seabed), the calculation model of the magnetic field generated by the current in the seawater or air was derived and validated, and the model was spread out to the distributing of magnetic field in the insulation semi-space of the n-layers media. Any point value of the magnetic field in the seawater and air can be calculated based on formulas. The results of the calculation indicated that the magnetic field generated by the point electrode in the seawater and air has obvious distribution character.
This paper introduces a novel GA-based algorithm for location of moving time-harmonic magnetic dipole. Based on the function of propagation of underwater electromagnetic wave, the new location method with the amplitude of the electromagnetic wave picked out from receiving signals is proposed. According to the overall search ability of the genetic algorithm, the passive location of the radiant point about the time-harmonic dipole was achieved by the using of characteristic quantity of the amplitude. The result of the simulation validated that: within the underwater measurement distance, higher precision of passive location can be achieved by using the method based on genetic algorithm.
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