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Study on the Characteristic of Electromagnetic Scattering from the Actual Rough Land Surface

Author: SongYunLong
Tutor: GuoLiXin
School: Xi'an University of Electronic Science and Technology
Course: Radio Physics
Keywords: Rough terrain Transmission coefficient Layered rough surface Composite scattering Hybrid algorithm
CLC: TN011
Type: Master's thesis
Year: 2008
Downloads: 207
Quote: 3
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This paper first gives the basic theory of rough surface scattering is discussed Kirchhoff approximation, perturbation method and the method of moments such as the basic method of rough surface scattering . Exponential and Gaussian spectral spectrum rough rough surface facing the ground than the simulations illustrate the reasons for selecting exponents , introduced the four components of Wang and Schmugge model , taking into account under different soil types , soil moisture and soil permittivity relationship . According to Kirchhoff's law and the presence of scalar approximation phase approximation studied under rough surface electromagnetic scattering medium 2 combined index rough surface of the autocorrelation function derived indices for different polarizations rough surface under the transmission coefficient is calculated . Obtained by numerical index different polarization state of the transmission coefficient with rough surface scattering angle , the scattering azimuth and incident wave frequency curves discussed rough surface parameters and different polarization state of the incident wave frequency on the transmission coefficient , was out of the rough surface index basic characteristics and the transmission coefficient versus frequency characteristics. Calculating D gives a slightly rough surface of layered medium bistatic scattering coefficient analytical method, the wave is different regions upstream and downstream as countless superposition of waves , the wave amplitude is composed of two the interface boundary conditions. Calculated using perturbation method first order scattering , this method takes into account multiple scattering between the interface process . While taking advantage of the current calculation based on the method of moments combined with high frequency hybrid Kirchhoff approximation algorithm analyzes the spectrum of one-dimensional index on rough ground and Fanger Wei infinitely long conductor of arbitrary cross-section of the composite target electromagnetic scattering , and the results with the traditional method of moments compared and verified.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > General issues > Basic theory > Radio wave propagation,the propagation mechanism
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