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

摘要

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. 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. To solve the EM scattering problem involving perfectly conducting (PEC) objects we make use of the Method of Moments (MoM) integral equation technique. The EM scattering numerical code was written in Fortran. The solution is applied to the investigation of EM scattering by a submarine modelled as a tapered long cylinder plus the tower when is placed in different positions relative to the source and the sensors. It is shown that, by an appropriate design of the experiment, the signal indicating the presence of the target can be increased relative to the signal obtained in its absence.