动态海面仿真和海天背景辐射特性研究
发布时间：2018-08-08 13:15
【摘要】：本文主要研究动态海面的光学辐射与散射特性。利用Modtran计算了在我国近海附近可见光、近红外、中波红外和远红外波段，不同高度、入射天顶角和时间的大气透过率、太阳光谱辐射照度、天空光谱辐射亮度和斜程光谱辐射亮度。采用Gerstner几何模型和基于FFT的海浪谱模型两种建模方法生成海面网格。利用Phillips海浪谱模型生成海面高度场，结合Cox-Munk斜率模型、海水折射率模型和Modtran预处理数据，仿真计算了不同海情下海面的光学图像。以傅里叶光学为基础，研究了不同波长和孔径的CCD和红外探测器的系统传递函数。仿真了不同波段下海面的光学系统成像。采用数字图像处理的方法，分析了频率滤波对图像质量的影响，讨论了直方图处理和滤波器在图像增强方面的作用。利用霍夫变化快速连接边缘检测算子检测出的孤立点，对动态海面的光电成像仿真系统给出的图像进行了海天线检测等方面的应用。
[Abstract]:The optical radiation and scattering characteristics of dynamic sea surface are studied in this paper. The atmospheric transmittance, solar spectral radiance and solar spectral radiance of visible, near-infrared, medium-wave and far-infrared bands, at different altitudes, incident zenith angle and time were calculated by Modtran. Sky spectral radiance and oblique spectral radiance. Two modeling methods, Gerstner geometric model and wave spectrum model based on FFT, are used to generate sea surface mesh. The sea surface height field was generated by using Phillips wave spectrum model. Combined with the Cox-Munk slope model, the refractive index model of seawater and the pretreatment data of Modtran, the optical images of sea surface under different sea conditions were simulated and calculated. Based on Fourier optics, the system transfer functions of CCD and infrared detectors with different wavelengths and apertures are studied. The imaging of sea surface optical system in different bands is simulated. The effect of frequency filtering on image quality is analyzed by digital image processing. The function of histogram processing and filter in image enhancement is discussed. Based on the outliers detected by the Hough change fast link edge detection operator, the application of sea antenna detection to the image obtained by the photoelectric imaging simulation system of the dynamic sea surface is presented in this paper.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P733.3;TP391.41
本文编号：2171888
[Abstract]:The optical radiation and scattering characteristics of dynamic sea surface are studied in this paper. The atmospheric transmittance, solar spectral radiance and solar spectral radiance of visible, near-infrared, medium-wave and far-infrared bands, at different altitudes, incident zenith angle and time were calculated by Modtran. Sky spectral radiance and oblique spectral radiance. Two modeling methods, Gerstner geometric model and wave spectrum model based on FFT, are used to generate sea surface mesh. The sea surface height field was generated by using Phillips wave spectrum model. Combined with the Cox-Munk slope model, the refractive index model of seawater and the pretreatment data of Modtran, the optical images of sea surface under different sea conditions were simulated and calculated. Based on Fourier optics, the system transfer functions of CCD and infrared detectors with different wavelengths and apertures are studied. The imaging of sea surface optical system in different bands is simulated. The effect of frequency filtering on image quality is analyzed by digital image processing. The function of histogram processing and filter in image enhancement is discussed. Based on the outliers detected by the Hough change fast link edge detection operator, the application of sea antenna detection to the image obtained by the photoelectric imaging simulation system of the dynamic sea surface is presented in this paper.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P733.3;TP391.41
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