基于光学成像的4179小行星表面反射特性研究

发布时间：2017-12-26 20:34

本文关键词：基于光学成像的4179小行星表面反射特性研究　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：2012年12月13日,我国的月球探测器嫦娥二号在距地球约700万公里的深空,以10.73km/s的速度770m的最近距离成功飞掠4179小行星Toutatis,获得了最高分辨率优于3m的系列可见光图像,在国际上首次获得4179小行星的清晰影像。本文拟通过对成像相机辐射定标数据处理,获取成像时刻4179小行星表面真实辐射亮度来研究4179小行星表面反射特性,具体内容如下:(1)使用1.6m积分球和光谱辐射计获取对4179小行星成像的嫦娥二号太阳翼监视相机的备份产品进行辐射定标,获得了十个辐亮度等级R、G、B三谱段的相机辐射定标数据。(2)应用最小二乘拟合方法,对相机辐射定标数据进行处理,获取相对定标校正矩阵,校正原始定标数据和4179小行星图像,以降低由于器件原因导致的像元响应不一致的问题。用校正后的定标数据获取绝对定标系数,将该系数应用于校正后的小行星图像,反演成像时刻4179小行星表面真实辐射亮度,获得成像时刻4179表面辐射亮度分布图。(3)基于表壤的辐射传输理论,研究4179小行星表面反射特性。由于嫦娥二号对4179小行星成像的特殊性,本文从反射率定义标准出发,根据Hapke对Nicodemus半球反射率的定义标准在行星科学应用中的描述,结合成像时刻4179小行星与太阳的距离、表面太阳光谱辐照度、成像光线条件等信息,获得4179小行星表面平均光谱反照率及表面反照率分布图。基于空间光学成像的行星表面反射特性研究方法,在行星科学研究中有应用价值。本文首次尝试使用基于空间光学成像的方法获得4179小行星表面光谱反照率及4179小行星的表面反照率分布图。这些数据可以为进一步分析小行星表面的局部光学特性以及形态学特征等提供有力支持,这对4179小行星科学研究有重要意义。
[Abstract]:In December 13, 2012, China's lunar probe Chang'e two in about 7 million kilometers away from the earth to the nearest distance of deep space, the speed of 10.73km/s 770m's successful flyby of asteroid 4179 Toutatis, a series of visible images obtained the highest resolution is better than 3m, get a clear image of the asteroid 4179 for the first time in the world. This paper through the imaging camera calibration data processing, get the imaging time 4179 asteroid surface real radiation brightness to study the 4179 reflection surface of the asteroid characteristics, the specific contents are as follows: (1) using 1.6m and integrating sphere spectral radiometer gets two Sun Wing surveillance camera to chang e asteroid 4179 backup radiometric imaging products standard, get ten radiance class R, G, B three spectral camera radiometric calibration data. (2) least squares fitting method is applied to process the radiometric calibration data of the camera, get the relative calibration correction matrix, correct the original calibration data and the 4179 asteroid image, so as to reduce the problem of pixel response due to device failure. The absolute calibration coefficient is obtained from corrected calibration data. The coefficient is applied to corrected asteroids, and the real radiance of the 4179 asteroids at the imaging time is retrieved, and the radiance distribution map of the 4179 surface is obtained. (3) based on the radiative transfer theory of surface soil, the surface reflection characteristics of 4179 asteroid are studied. The Chang'e two on the 4179 asteroid imaging particularity, this paper from the definition of reflectivity of Nicodemus Hapke, according to the criteria described in the hemisphere reflectivity using planetary science, combined with the imaging time 4179 asteroids from the sun, the surface of the solar spectral irradiance, imaging light conditions and other information, to obtain 4179 asteroid surface average spectral albedo the rate and surface albedo map. The research method of planetary surface reflection based on spatial optical imaging is of great value in the research of planetary science. In this paper, the spectral albedo of 4179 asteroid surfaces and the surface albedo distribution of 4179 asteroids are obtained by using the spatial optical imaging method for the first time. These data can provide strong support for further analysis of the local optical characteristics and morphological characteristics of asteroids, which is important for the scientific research of 4179 asteroids.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P185.7;V445.8

【参考文献】