Numerical experiments on enhanced backscatter
Enhanced backscatter otherwise termed as partial phase conjugation is a phenomenon that occurs to a wave that has been reflected back through the same inhomogeneous medium it traversed. The concept behind this phenomenon begins when a wave passes through a random inhomogeneous medium and propagates some distance beyond the medium but within the Fresnel region at which point the wave encounters a mirror. The wave is then reflected back through the same medium. The average angular far field intensity shows this phenomenon occurring that causes an enhancement of a portion of the spatial spectrum. The interest in this area arises from the many possible applications such as remote sensing, the study of sound wave propagation, imaging and phase conjugation techniques. There has been theoretical and experimental work in the area of enhanced backscatter but no work published, to date, on a numerical experiment of enhanced backscatter for the above conditions. Due to the mathematical difficulties in the theoretical work, it became obvious that a simulation would aid in the further study of this phenomenon. Hence, a simulation was developed that consists of a wave passing through a random inhomogeneous medium that has a power law spectrum. The wave is then reflected back through the same medium at which point the angular intensity statistics are studied. Various case studies were conducted that included changing: the strength of the medium; the m.i rror size; mirror shape; propagating distances; angle of incidence for the . . incoming wave. These results are presented in this thesis along with a comparison to the published theory of wave propagation through random medium.
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Master of Science (M.S.)
College of Engineering
Electrical Engineering and Communication Sciences
Length of Campus-only Access
Masters Thesis (Open Access)
Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic
Welch, Gisele, "Numerical experiments on enhanced backscatter" (1989). Retrospective Theses and Dissertations. 4244.