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SAR Imaging Simulations Based on the Ocean Scenes and the Electromagnetic Scattering Study

Author: GuoDing
Tutor: GuXingFa
School: University of Electronic Science and Technology
Course: Detection technology and automation devices
Keywords: SAR Electromagnetic Sea scenes Polarization Scattering
CLC: TN03
Type: PhD thesis
Year: 2011
Downloads: 302
Quote: 1
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Abstract

Since the beginning of 1976, with the Mount Debo Luo (Mandelbrot) series of fractal (Fractal)'s book publishing, fractal theory has aroused the concern of the global scientific community, and immediately in many fields of science reflects its great value. Fractal theory in complex formation mechanism of nature description and analysis to provide a simple and practical tool to get the attention of many industries and applications. Complex rough sea scenes electromagnetic scattering has always been a concern hotspot, due to the overall and local self-similarity, while every local can be increased to the similarity of the whole, in the rough sea surface scattering study of fractal theory naturally be People employed. Its multi-path for electromagnetic scattering sea, sea clutter study has certain significance; while on the waves, currents, sea waves within a certain explanation of physical phenomena; and, to some extent, contributed to the oil spill, surface ships other marine SAR monitoring of the development and application. In recent years, marine scientists have begun to fractal modeling method is applied to the sea and the waves of spectral analysis. Firstly, the current research status and a brief analysis of the significance of research, this paper also describes the structure of the content and innovation. First, through the synthetic aperture radar remote sensing applications in the ocean on the main parameters of a brief introduction, on this basis, introduction of the analysis of rough surface scattering Kirchhoff approximation method, using stationary phase method for the derivation of the geometrical optics solution , then according to Maxwell's equations, electromagnetic wave polarization through the analysis of the polarization ellipse equation is derived, and the polarization of the commonly used methods were theoretical introduction. Finally, the application of polarization ball, Stokes matrix representation for the scattering of polarized targets discussed single-station transceivers colocated with the bistatic scattering matrix bistatic scattering matrix. By the sea were introduced one-dimensional, two-dimensional fractal model, using the model, combined sea surface electromagnetic Bragg scattering model, as well as the speed of the waves imaging process bunching mechanism theoretical models, respectively, for monochromatic waves were imaged with complex simulations sea , combined with the ocean wave spectrum and synthetic aperture radar imaging characteristics, carried out a statistical analysis to verify the sea on the SAR imaging model validity. Discussion of spaceborne SAR echo signal generation algorithm. The first presents a time-domain algorithm simulation to accurately simulate the target SAR echo signal, the algorithm on an elliptical orbit between the target and the radar slant range calculated accurately calculate the presence of excessive lack of distribution is not suitable for generating target back wave signal. Therefore, it gives a frequency-domain echo signal generation algorithm, the method can satisfy certain conditions in two-dimensional FFT algorithm using the rapid distribution of target echo signals generated with high computational efficiency. Based on Kirchhoff approximation theory and Franceschetti ground scenario simulation model, implements a small plane element according to the geometric relationship between the SAR calculation unit facet backscatter coefficient algorithm. In the far field approximation using the Kirchhoff equation backscattering coefficient, gives the second part of the formula calculation methods.

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