Scattering of transient radiation from an imperfectly conducting infinite periodic sea surface

The performance of an impulse radar in a sea-surface environment is strongly influenced by the ability to minimize the sea clutter. Two methods of determining the transient scattering from a sea-surface interface are investigated. One method utilizes the Rayleigh approximation, and therefore is valid only for certain parameter regimes, while the other method uses magnetic field integral equations (MFIE) and yields correct results for all regimes. The advantage of the Rayleigh approximated analysis is in the computation time involved. In both methods, frequency-domain results are obtained. A large frequency bandwidth is needed to properly reconstruct the time-domain transient response; this implies a large number iterations is needed to implement such a bandwidth. The knowledge gained from this analysis will allow for a minimization of the sea clutter, thus improving the impulse radar detection in a sea environment. The TM polarization is of the greatest interest, because of the Brewster angle phenomenon, therefore only the TM case is discussed in detail.