Papers Published

1. Carin, L. and Zhao, Z., Numerical methods for analysis of EM scattering from an electrically large ocean surface, URSI 2004 International Symposium on Electromagnetic Theory, vol. vol.2 (2004), pp. 733 - 5 .
   (last updated on 2007/04/14)

   Abstract:
   Electromagnetic scattering is considered from finite and electrically large perfectly conducting rough surfaces. Three solution approaches are considered. The first two are based on a multi-level fast-multipole algorithm (MLFMA) formulation. In one MLFMA approach the rough surface resides in free space and is terminated by a resistive taper. In the second MLFMA approach the rough surface is terminated in an infinite perfectly conducting halfspace, with a smooth taper employed between the rough surface and the infinite halfspace, thereby avoiding the need for a resistive taper. The first MLFMA formulation is based on a free-space electric-field integral equation analysis, and the second uses the halfspace Green's function and a combined-field integral equation. These two approaches, within the context of the MLFMA, allow consideration of electrically large surfaces, permitting comparison with high-frequency asymptotic solutions. The third method considered is a ray-based solution, with which even larger surfaces may be considered. Several numerical results are presented, with which the relative accuracy and computational efficiency of the approaches are compared

   Keywords:
   electric field integral equations;electromagnetic wave scattering;Green's function methods;magnetic field integral equations;ray tracing;rough surfaces;