The Study On Terrain Scattering Characteristics And The Establishment Of Empirical Model

Based on random rough surface scattering theory and equivalent dielectric theory, associating with experimental data, we research on the terrain backscattering characteristics of bare soil, sands, vegetation, sea ice, and so on. A new terrain scattering empirical model is proposed by summarizing the characteristics of the existing empirical models.The theoretical part of this thesis deals with electromagnetic scattering theory of random rough surface such as Kirchhoff Approximation method, the Small Perturbation Method, and the Small Slope Approximation method. Terrain backscattering characteristics of bare soil and sands are analyzed, respectively. The layered-dielectric anisotropic theory and the first-order renormalization are introduced to theoretically analyze and calculate the backscattering of vegetation and sea ice.In our field experiments, we measured backscattering fields of many terrains such as agricultural land, sands, grassland and sea ice by using a measurement method of multiple wave-bands and dual polarization. Good agreements are found between the theoretical results and experimental results, which confirms the validity of the scattering theory used in this thesis.Associating measured data and the existing empirical models, a new terrain scattering empirical model is proposed. Numerical result generated by the new model is compared with the measured data for several different terrains. The results are in good agreement, confirming a good applicability and accuracy of the new model.