Parametric Investigation of Ground Roughness on the Interference Between the AP-Mine and a Clutter-Object Buried Under Two-Dimensional Random Rough Surfaces

摘要

In realistic landmine fields, the anti-personnel plastic mine is often buried nearby a clutter-object under the ground. The presence of a second object buried near the mine under a two-dimensional (2-D) rough ground can easily obscure the target and/or cause a false alarm. The separation distance between the AP mine and clutter-object plays a significant role on the probability of true or false alarm in this situation. A rigorous electromagnetic model has been developed to analyze the scattering mechanism between the target and the clutter-object, between the target and the rough ground, between the clutter-object and the rough ground and the multiple scattering between different spots on the rough ground itself. The new rigorous model is based on the classical electromagnetic equivalence theorem leading to producing six new integral equations. Using the Method of Moment (MoM), the new integral equations are transformed into a linear system of equations to be solved for the unknown electric and magnetic currents on the surface of three scatterers; (1) rough ground, (2) target and (3) clutter-object. The MoM impedance matrix completely represents every interaction between these three scatterers. The superior Steepest Descent Fast Multipole Method (SDFMM) is used to tremendously speed up the computations of the unknown MoM surface currents.