月表虹湾地区辉石及橄榄石含量反演

Lunar pyroxene and olivine abundance analysis of Sinus Iridum

月表成分定量分布是月球探测中重要的一个科学问题.为了建立月表虹湾地区辉石与橄榄石的含量反演模型,本文在深入分析理解月表主要矿物的光谱特性的基础上,首先使用LSCC实测矿物数据,根据辉石、橄榄石在300–2600 nm波谱范围的吸收特征分布,通过MGM模型计算19个采样点的光谱数据的5个吸收特征,每个吸收特征有吸收中心(Center)、吸收宽度(FWHM)、吸收强度(Strength)这3个吸收特征参数,利用多元回归分析建立矿物反演模型.由于缺乏月表实测数据,本文引入M3高光谱数据利用Hapke辐射传输模型制作模拟混合矿物光谱对模型性能进行检验.最后,将反演模型应用于嫦娥三号月球车的首选着陆点—虹湾地区,得到其矿物含量分布图.实验表明利用MGM模型拟合分析的方法进行高光谱遥感矿物识别是一种可行的研究方法.

Composition distribution on the lunar surface is an important scientific topic. In order to establish pyroxene and olivine quantitative inversion models of Sinus Iridum, we analyze the spectral characteristics of major mineral. First, according to pyroxene and olivine in the 300-2600 nm spectral range of absorption feature, we use Modified Gaussian Model （MGM） model to calculate spectral absorption characteristics at 19 sampling points of the Lunar Soil Characterization Consortium （LSCC）, which is also performed detailed chemistry and modal abundance analyses on each of these samples. We obtain five spectral absorption characteristics, and each has three characteristic parameters absorption center （Center）, absorption width （FWHM）, and absorption intensity （Strength）. Then, the mineral inversion model is established by using linear regression analysis based on LSCC data, and is validated by simulated spectra, which are made by the bidirectional reflectance function of Hapke on M3 hyper-spectra data. At last, the quantitative inversion models of pyroxene and olivine have been applied to the Sinus Iridum area, which is the preferred landing station of Chang＇E-3 lunar rover. The mineral abundance distribution maps of this area are made. Experiments show that using MGM model fitting analysis method for hyper-spectra remote sensing of minerals identification is a kind of feasible research approach.