研究目的
To solve the electromagnetic scattering field from the random rough surface using the decomposition-reconstitution theorem.
研究成果
The decomposition-reconstitution theorem is effective in solving the electromagnetic scattering field of the random rough surface. It simplifies the complexity of solving scattering for the existing solutions and can be used to solve the scattering field of large rough surfaces. It presents a multi-scale method for the inversion of the surface structure.
研究不足
The difference between the reconstituted scattering field and the total scattering field is less than 3 dB at most scattering angles, but larger errors occur at scattering angles greater than 70 degrees. The computational time of the total scattering field is longer than the computational time of the reconstituted field in the same accuracy.
1：Experimental Design and Method Selection:
The decomposition-reconstitution theorem is used to solve the electromagnetic scattering field from the random rough surface. The random rough surface is decomposed into a series of fractals described by sinusoidal basis functions. The scattering fields are computed for each fractal and then reconstituted by vector-superposing the scattering fields of fractal. The theorem is demonstrated by numerical simulation using FDTD.
2：Sample Selection and Data Sources:
The surface profile of a typical dry soil and a real soil surface in Qionglai, Sichuan, are used for numerical simulation and application examples.
3：List of Experimental Equipment and Materials:
Ground-based scattering measurement system established by the University of Electronic Science and Technology of China (UESTC) in
4：Experimental Procedures and Operational Workflow:
20 The surface profile is decomposed by the Fourier series. The scattering fields of surface harmonic components are computed and then reconstituted. The total scattering field and the reconstituted scattering field are compared.
5：Data Analysis Methods:
The difference between the reconstituted scattering field and the total scattering field is analyzed. The backscattering coefficient is compared with ground-based scattering measurement data and AIEM model.
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