Abstract
This paper addresses a practical application for the compensation of a local magnetic perturbation in a ship in the near field region. The process will avoid expensive deperming techniques usually applied to ships to treat magnetic anomalies. The technique includes a new system to construct magnetic maps on flat ferromagnetic surfaces. Once the magnetic maps are obtained, a new system is proposed to evaluate and locate local magnetic perturbations. Once the local perturbations are located, they are compensated by local degaussing coils. The new technique has been applied to the detection of local magnetic perturbations in four naval platforms. Two of them presented important magnetic anomalies, and were successfully detected and corrected by applying the new technique, thus showing its practical value.
Highlights
There are currently two technological trends to assure magnetically silent naval platforms
If a vessel is compensated by a degaussing system, important local magnetic perturbations may still be present in certain areas of the ship, which may induce strong perturbations on the relevant bearing instrumentation
This paper proposes an alternative technique for eliminating local magnetic perturbations on naval platforms avoiding complex deperming processes
Summary
There are currently two technological trends to assure magnetically silent naval platforms. It is assumed that available calibration processes cannot eliminate the high local gradients that can have an influence on some sensitive bearing magnetic sensors, like the bearing sensor of a helicopter over a flight deck This local behavior cannot be predicted by the magnetic ship models (theoretical or numerical) used in the design of the degaussing system coils [3,4,5,6]. While traditional degaussing systems are designed for compensation of magnetic perturbations in the far-field region, the new system is able to compensate local magnetic perturbations in the near-field region, assuring a correct operation on the sensitive navigation instruments, and at the same time avoiding the costly deperming processes. When the relevant parameters are under the threshold levels, the naval platform operates in a save condition, with no interference with the on-board magnetic sensors
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