Doppler Shifted Scattering from a Target Moving Along Inhomogeneous Random Rough Surface

This paper is concerned with an analysis of backscattering of electromagnetic waves from a target moving along random rough surfaces (RRSs) such as desert, hilly terrain, forest, sea surface and so on. First we introduce the discrete ray tracing method (DRTM), and second we apply this method to the backscattering problem in order to investigate the influence of the backscattering from RRSs on the radar cross section. Finally we show some numerical examples for the Doppler shifted backscattering of the total fields in comparison with that of the subtracted fields. The subtracted express reflection from the target as well as electromagnetic interaction between target and rough surface. It is numerically demonstrated that the total backscattering dominates almost everywhere except for the near region of radar, even if we employ an antenna with a very sharp directivity. We also investigate statistics of Doppler shifted backscattering from a target.