基于嫦娥二号卫星微波辐射计亮温数据反演月壤介电常数

发布时间：2018-04-06 05:04

  本文选题：嫦娥二号卫星　切入点：亮温　出处：《地球科学(中国地质大学学报)》2014年11期

【摘要】：月壤介电常数是当前月球微波遥感探测的基础,是月壤厚度、成分等信息提取不可或缺的参数.为了实现全月介电常数反演,通过对嫦娥二号卫星微波辐射计亮温数据进行时角校正,得到同一时角的全月微波亮温图.全月微波亮温表现出随月球地形、月壤成分及纬度变化的特征.基于校正后的微波辐射亮温,结合辐射传输模型,通过解算相关参数,反演得到3GHz频率下全月介电常数分布.其中,月海地区的介电常数实部高于月陆地区,且月球极地区域介电常数实部偏低;而介电常数虚部则在月海区域和艾肯盆地较高.通过模拟月表介电常数实验对反演结果进行温度校正,得到22℃下全月介电常数.将反演结果和月壤真实样品的介电常数测量值进行比较评价.结果表明介电常数实部相对误差都低于11%;虚部相对误差偏大,但其差值最大仅为0.02.因此,基于嫦娥二号卫星微波辐射计亮温数据反演月表介电常数的方法是可行的.
[Abstract]:The permittivity of lunar soil is the basis of lunar microwave remote sensing, and it is an indispensable parameter for extracting information such as the thickness and composition of lunar soil.In order to realize the inversion of the permittivity of the whole month, by correcting the brightness temperature data of the Chang 'e-2 satellite microwave radiometer, the microwave bright temperature map of the whole month at the same time angle is obtained.The microwave brightness temperature of the whole moon shows the characteristics of variation with the lunar topography, lunar soil composition and latitude.Based on the corrected brightness temperature of microwave radiation and the radiation transfer model, the permittivity distribution of the whole month at 3GHz frequency is obtained by calculating the relevant parameters.Among them, the real part of dielectric constant in the lunar sea area is higher than that in the lunar land area, and the real part of the dielectric constant in the polar region of the moon is lower, while the imaginary part of the dielectric constant is higher in the lunar sea region and the Eiken basin.The temperature correction of the inversion results is carried out by simulating the dielectric constant of the month surface, and the dielectric constant of the whole month is obtained at 22 鈩，

本文编号：1718069