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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 39743 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Shishegar, Amir Ahmad
- Abstract:
- Electromagnetic wave scattering from rough surfaces has been the subject of intensive investigations over the past several decades for its applications in important remote sensing problems. The problem of scattering from random rough surfaces hasn't full analytical closed form solution. In millimeter-wave band some surfaces like asphalt, concrete, which has roughness in millimeter range, must be considered as rough surfaces. A major part of the literatures are specified to numerical and statistical approach. In this thesis the electromagnetic waves scattering from rough surfaces in millimeter-wave band is studied. The main goal of this thesis is to find the available ways for applying the scattering in the reflection process in the ray tracing method. Semi-analytical solutions like Kirchhoff and small perturbation method are studied. Also method of moments as a powerful numerical method for rough surfaces scattering is considered. Monte-carlo simulation is used in this thesis for reaching an average scattering pattern of the selected rough surfaces. Harmonic extraction analysis for rough surface is applied for computing the scattering pattern which is useful in finding the dominant scattered ray from the rough surface. Results are validated with exact numerical answers. Modeling a dielectric with a lossy conducting surface is another part of this thesis. This model works very well in millimeter-wave band, because of the small penetration depth of the wave in lossy materials. Also resistive surface approach is used in this thesis for evaluate the scattering of plane wave from rough surface. With this method the Fresnel's reflection coefficients are corrected for rough surfaces like asphalt and concrete in millimeter-wave band. These corrected Fresnel's coefficients could be used easily in ray tracing method.
- Keywords:
- Scattering ; Rough Surface Scattering ; Millimeter Wave ; Kirchhoff Method ; Moment Method ; Periodic Rough Surface ; Fresnel Coefficient Correction
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