Diffraction Radio Tomography of Ionospheric Irregularities
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In forward scattering, the definition of the linear integrals q z (ρ, ω) (3.21) from the complex potential q(r,ω) reduces the ISP to the problem of tomographic reconstruction, i.e., the problem of reconstructing an object from its projections. Achievements in X-ray tomography in recent decades have been responsible for the intense development of tomographic techniques for recovering the structure of nonuniform objects. Reconstruction algorithms applied in practical X-ray tomography are based on a rectilinear approximation of ray trajectories. Mathematically, such problems are reduced to reconstruction of the damping function or the refraction coefficient from the set of linear integrals, i.e., to reconstructing the object from its projections of smaller dimensions. X-ray radiation has been followed for tomographic purposes by practically all of the known kinds of radiation and waves. In tomographic studies using optical, ultrasound, radio, microwaves and other kinds of waves, linear ray approximation does not often lead to good results. Therefore, in recent years, the reconstruction methods making use of refraction and diffraction effects have been developing intensively, and a special term — diffraction tomography — has come into being.
KeywordsComplex Phase Diffraction Effect Tomographic Reconstruction Fresnel Zone Diffraction Tomography
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