Calculations of Radar Cross Section of Complex-shaped 3D Objects

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Up to now in researches of radar cross section (RCS) calculations, the RCS have been calculated for 2D objects in many cases. Even though for 3D objects, the RCS have been calculated only for simple-shaped 3D objects, of calculated with approximation quiteoften. In this research we calculated the RCS of arbitrary-shaped 3D objects accurately using the Yasuura method which was a high-reliable numerical analysis technique, and studied about characteristics of electromagnetic wave scattering. And also, we analyzed characteristics of optical devices and optical waveguides, which are composed of various materials and/or complex structures, using the FD-TD method as a preferable numerical analysis technique for the parallel computation. The main results of this research are as follows :1.We offered the Yasuura method introducing the Generalized Multipole Technique (GMT) , that could calculate the RCS of complex-shaped 3D objects accurately, and could be a effective numerical analysis technique for the scattering problems on account of fast convergence of the solutions. Practically, we calculated the RCS of various complex-shaped 3D objects, such as peanutshell-shaped, doughnut-shaped and so on.2.We showed that the FD-TD method using Perfectly Matched Layr (PML) as the absorbing boundary condition is widely applicable to electromagnetic wave scattering problems with arbitrary complex-shaped 3D objects. Furthermore we also showed that it could be a powerful technique for the analysis of potical devices and/or optical waveguides.3.We made up a small-scaled parallel computer system composed of transputers and personal computers for laboratory use, which enabling the parallel computation of the both methods.