Modelling the Electromagnetic Scattering by 3-D Objects in a Layered Media - Electromagnetic Active Detection of Metallic Targets

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Authors
  1. Birsan, M.S.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
The underwater electromagnetic (EM) active detection technique attempts to reveal a stealth iron-hull vessel (submarine or surface warship) located in a horizontal layer of seawater. It is supposed that the vessel has no signature, acoustic or electromagnetic, and the only way to detect its presence is by measuring the scattering signal caused by an active source placed also in the water. Our goal is to numerically investigate the EM scattering process in the presence of a metallic vessel of arbitrary shape placed inside a lossy media. A frequently occurring geometry for the marine environment is a horizontal stratification with constant conductivity, permittivity and permeability in each layer. The EM scattering from an arbitrary shaped electrical conducting object located in a layered medium is an intricate problem due to the interaction between the boundaries of the media and the scattering object. To solve the EM scattering problem involving perfectly conducting (PEC) objects we make use of the Method of Moments (MoM) integral equation technique. The scattering fields are expressed as surface integrals on the scattering object surface. The integrands of these integrals consist of scalar products between an unknown surface current density and an electric or magnetic dyadic Green's function for the electric and magnetic fields, respectively. Then the unknown surface current density is obtained from an integral equation derived from the magnetic scattered field representatio

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Keywords
layered lossy media;active vessel detection;method of moments;Permittivity;Electric field detection
Report Number
DRDC-ATLANTIC-TM-2004-246 — Technical Memorandum
Date of publication
01 Dec 2004
Number of Pages
38
DSTKIM No
CA025786
CANDIS No
523528
Format(s):
CD ROM

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