| Characteristics and Measurement Method of the Underwater Electromagnetic Signature Emitted from a Naval Ship |
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Chang-Seob Yang, Hyun-Ju Chung, Seung-Je Shin |
| 함정 발생 수중 전자기장 신호의 특성 및 측정 기법 |
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양창섭, 정현주, 신승제 |
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국방과학연구소 |
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| Abstract |
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The underwater electromagnetic signatures of a naval ship are mainly generated from three sources which are the permanent and induced magnetic field in the ship's hull and other ferrous components, the cathodic current electromagnetic field established by the Impressed Current Cathodic Protection(ICCP) system or the Sacrificial Anode and the stray electromagnetic fields generated by onboard equipment. These signatures can be minimized by certain design methods or installation of signature reduction equipment. In this paper, we represented the characteristic of the underwater electromagnetic signature and the signature reduction techniques for a naval ship. Also, we measured the electromagnetic field changes emitted from the real ship using the Electric and Magnetic field Measurement System(EMMS). We found that the underwater electromagnetic signature for a naval ship can be used as input or trigger signal in a surveillance system and an influence mine. |
| Key Words:
Alternating Electromagnetic Field, Static Electromagnetic Field, Impressed Current Cathodic Protection System, Active Shaft Grounding, Electric and Magnetic field Measurement System |
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