本文關(guān)鍵詞：基于嫦娥二號亮溫?cái)?shù)據(jù)與溫度相關(guān)的月壤介電常數(shù)反演研究　出處：《華中科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 嫦娥二號 微波輻射亮溫 物理溫度 月壤介電常數(shù)

【摘要】：介電常數(shù)是月壤基礎(chǔ)物理參數(shù),準(zhǔn)確的月壤介電常數(shù)參數(shù)模型對月球主被動微波遙感和遙感參數(shù)的定量提取具有重要意義�，F(xiàn)有的介電常數(shù)模型均沒有考慮到物理溫度的影響,然而研究表明,月壤介電常數(shù)與物理溫度有關(guān)。本文基于月壤輻射亮溫模型,并改進(jìn)溫度剖面的計(jì)算,利用嫦娥二號微波輻射亮溫?cái)?shù)據(jù)以及Diviner月球輻射測量儀(DLRE)紅外亮溫?cái)?shù)據(jù),反演出了與溫度相關(guān)的月壤介電常數(shù)參數(shù),并提出了考慮溫度影響的微波波段月壤介電常數(shù)參數(shù)模型。本文首先介紹了月表多層輻射亮溫模型,并分析了地形、物理溫度剖面和介電常數(shù)等參數(shù)對輻射亮溫的影響。利用嫦娥二號實(shí)測亮溫?cái)?shù)據(jù)進(jìn)行時(shí)空歸一化處理,得到時(shí)空歸一化亮溫差τ。由美國月球軌道勘測飛行器(LRO)上搭載的月球輻射測量儀(DLRE)讀取月球表面物理溫度數(shù)據(jù)。根據(jù)不同的溫度段選取時(shí)空歸一化亮溫差τ,計(jì)算并分析在不同的溫度段下τ與鐵鈦含量的相關(guān)系數(shù)。結(jié)果表明,在不同的溫度段下τ與鐵鈦的相關(guān)性是不一樣的,溫度越高,相關(guān)系數(shù)越大。由此得出溫度會影響月壤介電常數(shù)的結(jié)論。利用嫦娥二號亮溫?cái)?shù)據(jù)反演介電常數(shù)時(shí),首先需要求解一維熱傳導(dǎo)方程得到月壤溫度剖面,通過對比求解一維熱傳導(dǎo)方程得到的表面溫度與實(shí)測表面溫度,發(fā)現(xiàn)二者在某些地區(qū)存在較大差異。為了得到更準(zhǔn)確的溫度剖面,提出了根據(jù)實(shí)測表面溫度查找對應(yīng)溫度剖面的改進(jìn)方法。然后利用不同溫度段下的嫦娥二號亮溫?cái)?shù)據(jù),運(yùn)用非線性多變量約束最優(yōu)化方法,基于月表多層微波輻射亮溫模型,對月壤介電常數(shù)進(jìn)行反演,得到了溫度范圍在300~390K內(nèi)考慮了溫度影響的月壤介電常數(shù)模型。最后利用此介電常數(shù)模型計(jì)算了月海、月陸以及撞擊坑等典型地貌區(qū)域的沿軌亮溫,計(jì)算的亮溫值與嫦娥二號實(shí)測亮溫值之間的均方根誤差在7K之內(nèi),較現(xiàn)有的介電常數(shù)模型的亮溫計(jì)算值有較大改進(jìn)。這也在一定程度上驗(yàn)證了本文所提介電常數(shù)參數(shù)模型的的準(zhǔn)確性。
[Abstract]:Dielectric constant is the basic physical parameter of lunar soil. Accurate model of permittivity parameters of lunar soil is of great significance to the quantitative extraction of lunar active and passive microwave remote sensing and remote sensing parameters. The existing models of dielectric constant do not take into account the influence of physical temperature, however, the research shows that. The dielectric constant of lunar soil is related to physical temperature. Based on the radiant bright temperature model of lunar soil, the calculation of temperature profile is improved. Based on the light temperature data of Chang 'e-2 microwave radiation and the infrared bright temperature data of Diviner lunar radiometer, the permittivity parameters of lunar soil related to temperature are obtained. A microwave wave band permittivity model of lunar soil considering the influence of temperature is proposed. Firstly, the multi-layer radiant bright temperature model of lunar surface is introduced, and the topography is analyzed. The effect of physical temperature profile and dielectric constant on the radiation brightness temperature is studied. The Chang 'e-2 measured brightness temperature data are used to normalize the temperature in time and space. The space-time normalized bright temperature difference 蟿. The lunar radiometer DLREE carried by the US Lunar Orbital Reconnaissance vehicle (LRO) is obtained. The physical temperature data of the lunar surface are read. According to the different temperature bands, the space-time normalized brightness temperature difference 蟿 is selected. The correlation coefficient between 蟿 and Fe-Ti content at different temperatures is calculated and analyzed. The results show that the correlation between 蟿 and iron-titanium is different at different temperatures, and the higher the temperature is, the higher the temperature is. The larger the correlation coefficient is, the more the conclusion is that the temperature will affect the permittivity of lunar soil. When using the light temperature data of Chang 'e-2 to retrieve the dielectric constant, it is necessary to solve the one-dimensional heat conduction equation to get the temperature profile of lunar soil. By comparing the surface temperature obtained by solving one-dimensional heat conduction equation with the measured surface temperature, it is found that there is a great difference between them in some areas, in order to obtain a more accurate temperature profile. An improved method to find the corresponding temperature profile according to the measured surface temperature is proposed, and then the nonlinear multivariable constrained optimization method is applied to the Chang 'e-2 bright temperature data at different temperatures. Based on the bright temperature model of multi-layer microwave radiation, the permittivity of lunar soil was retrieved. The dielectric constant model of lunar soil considering the influence of temperature in the temperature range of 300 ~ 390K is obtained. Finally, the lunar sea is calculated by using this dielectric constant model. The root-mean-square error between the calculated brightness temperature and the measured light temperature of Chang 'e-2 is within 7K in the typical geomorphologic regions such as lunar land and impact crater. Compared with the existing dielectric constant model, the calculation value of brightness temperature is improved greatly, which verifies to some extent the veracity of the dielectric constant parameter model proposed in this paper.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P184.5

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