基于嫦娥多通道辐射亮温数据的月壤介电常数反演研究

发布时间：2018-03-10 22:36

本文选题：嫦娥一号　切入点：亮温　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：月壤介电常数是影响月球表面微波辐射亮温的一个主要因素,要想建立准确的月表微波辐射亮温模型,首先需要确定一个准确的月壤介电常数模型。本文基于嫦娥多通道(19.35GHz、37GHz)微波辐射亮温数据反演了月壤介电常数,并对反演结果进行了分析。本文首先介绍了月表多层微波亮温模型和模型的主要参数,并重点分析了月壤密度、物理温度剖面和月壤介电常数对亮温的影响。分析结果表明,铁钛含量对亮温的影响与介电常数模型中铁钛含量的权重有关。然后利用嫦娥一号实测亮温数据,计算了全月白天的时空归一化亮温差?,并分析了白天?与铁钛含量的相关性,同时也分析了赤道地区正午时刻实测亮温和铁钛含量的相关性。研究结果表明,铁含量和钛含量对亮温的影响程度不一致,因此二者在月壤介电常数模型中的权重不同,不能简单的将它们相加,而应该分别讨论铁含量和钛含量对亮温的影响。利用嫦娥一号微波亮温数据,反演月壤介电常数模型时,首先对比实测亮温与利用现有的月壤介电常数模型得到的模拟亮温随铁钛含量变化的趋势,确定了带参数的月壤介电常数模型的形式。然后根据嫦娥一号19.35GHz和37GHz的实测?与铁钛含量的相关性,结合月表多层微波辐射亮温模型和多变量约束最优化方法,反演了月壤介电常数模型,并对反演结果进行了分析和验证。结果表明,利用反演的月壤介电常数模型得到的模拟?与实测?随铁钛含量的变化趋势基本一致,同时利用反演的介电常数模型计算的赤道地区正午时刻的模拟亮温与实测亮温随铁钛含量的变化趋势也基本一致,且模拟亮温和实测亮温的幅值基本相当,这就从亮温相对值和绝对值的角度验证了反演的月壤介电常数的正确性。嫦娥一号校准数据反演结果与嫦娥一号数据反演结果基本一致,这也进一步检验了反演结果的稳定性。同时通过与月壤样本实测的介电常数的对比,也说明了本文反演结果的合理性。
[Abstract]:The permittivity of lunar soil is one of the main factors that influence the brightness temperature of microwave radiation on the surface of the moon. In order to establish an accurate model of the bright temperature of microwave radiation on the surface of the moon, First of all, it is necessary to determine an accurate model of the permittivity of lunar soil. In this paper, the dielectric constant of lunar soil is inversed based on the light temperature data of Chang'e multi-channel (19.35GHz ~ 37GHz) microwave radiation. In this paper, the main parameters of the multi-layer microwave bright temperature model and model are introduced, and the effects of lunar soil density, physical temperature profile and permittivity of lunar soil on the brightness temperature are analyzed. The influence of iron-titanium content on the brightness temperature is related to the weight of iron-titanium content in the dielectric constant model. , and analyzed the day? The correlation between iron content and titanium content is also analyzed. The results show that the effect of iron content and titanium content on the brightness temperature is not consistent. Therefore, the weight of them in the dielectric constant model of lunar soil is different, so they can not be simply added together, but the effects of iron content and titanium content on the light temperature should be discussed separately. When using the microwave light temperature data of Chang 'e-1, the dielectric constant model of lunar soil can be retrieved. By comparing the measured light temperature with the simulated light temperature with the change trend of iron and titanium content, the model with parameters is determined, and then the measured results of Chang'e 1 at 19.35 GHz and 37 GHz are given. The correlation with iron-titanium content, combined with the bright temperature model of monthly surface microwave radiation and multi-variable constrained optimization method, is used to invert the permittivity model of lunar soil, and the inversion results are analyzed and verified. By using the inverse model of permittivity of lunar soil? And the test? The trend of variation with iron-titanium content is basically the same, and the variation trend of simulated brightness temperature at noon time in equatorial region and that of measured bright temperature with iron and titanium content is basically the same, which is calculated by using the inverse dielectric constant model. And the amplitude of simulated brightness temperature is similar to that of measured light temperature. This verifies the correctness of the inversion of the permittivity of lunar soil from the point of view of the relative and absolute values of bright temperature. The inversion results of the calibration data of Chang 'e-1 are basically consistent with the inversion results of the Chang 'e-1 data. This further tests the stability of the inversion results and proves the rationality of the inversion results by comparing them with the measured permittivity of lunar soil samples.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P184.5

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