Method Of Moment Investigation On The Electromagnetic Scattering From The Rough Surface And The Composite Scattering From The Rough Surface And The Target

In this thesis, the properties of the electromagnetic (EM) scattering from a roughsurface and the composite scattering from a rough surface with a target have beeninvestigated through the method of moment (MOM). The efficient multiregion modelhas been introduced to fastly calculate the EM scattering from a perfectly electricalconducting (PEC) rough surface with or without a PEC target above it. The charactericsof the EM scattering from a2-D Gaussian rough surface have been investigated withgeometric modeling by the Non_Uniform Rational B-Spline (NURBS) surface. Mainworks of this thesis are as following1. According to the characteristics of the EM scattering from a1-D single-layeredrough surface and a1-D multi-layered rough surface, and the intercommunity of EMscattering from them with a target, several conclusions of calculating the scattering froma1-D rough surface with and without a2-D target through the MOM have been shown.2. To overcome the defect of the MOM in solving the EM scattering under lowgrazing angle for the long simulated rough surface, based on the message passinginterface (MPI), the parallel Fast Multiple Method (FMM) has been applied to study theproperties of the EM scattering from a1-D rough surface with and without a2-D targetunder low grazing anlge.3. The efficient multiregion model has been introduced to calculate the EMscattering from a PEC rough surface with or without a PEC target above it. Theprinciple of dividing the rough surface has been presented in detail4. The NURBS surface has been applied to model the2-D rough surface. TheMOM-NURBS is adopted to solve the electric field integral equation (EFIE) with theroof-top basis function and the razor-blade matching function on the NURBS surface.The parallel MOM has been used to study the properties of EM scattering from a2-DPEC Gaussian rough surfac with geometric modeling by the NURBS surface.5. The higher order MOM has been adopted to study the properties of the bistaticscattering from a2-D PEC Gaussian rough surface with the modified Legendrepolynomials as the hierarchical higher order basis functions. The optimized processes ingenerating the impedance matrix are presented. The singularity cancellation method hasbeen applied to treat the singular integrals via coordinate transformation.