本文選題：嫦娥一號 + DEM�。� 參考：《華中科技大學(xué)》2012年碩士論文

【摘要】：月壤厚度是探索月球的四大重要目標(biāo)之一，反演月壤厚度需要建立準(zhǔn)確的微波輻射亮溫模型。本文詳細(xì)討論了月壤輻射傳輸模型的發(fā)展過程及影響亮溫的重要因素，如地形、鄰坡散射和微尺度的粗糙度，并在現(xiàn)有的亮溫模型基礎(chǔ)之上，利用嫦娥一號CCD影像與輻射計的同軌特性，添加了重要的地形因素，從理論上可以模擬月表任意時刻、任意位置的亮溫，并且能夠直接和微波輻射計實測數(shù)據(jù)相比較，這是新模型與之前的亮溫模型之間最突出的區(qū)別。 為了利用與微波輻射計同軌掃描的CCD影像生成DEM，本文首先介紹了基于三線陣CCD影像的三維建模的流程，并以Hercules撞擊坑為例，發(fā)現(xiàn)計算的DEM主要存在粗差簇和粗差線兩種粗差，討論了這兩種粗差的特點和形成原因，并提出局部仿射變換抑制粗差簇，以角錐體法代替經(jīng)典答解方法來抑制粗差線。最后以有效太陽輻照度圖像較好地反映出DEM中的撞擊坑的輪廓信息，通過比較證明修正后的DEM精度有了較大的提高，并由此得到一些關(guān)于粗差線的初步結(jié)論。 在得到DEM之后，通過地形修正和遮蔽可計算出有效太陽輻照度，并通過實例證明了地形修正的確能夠造成輻照度的局部增強(qiáng)和局部衰減，并且遮蔽區(qū)域和CCD影像較好地符合。然后針對當(dāng)前的熱傳導(dǎo)方程不能適用于任意月壤厚度的問題，分析了熱傳導(dǎo)方程的迭代穩(wěn)定條件，并提出了一種新的自適應(yīng)分層方法。 為了與實測數(shù)據(jù)相比較，在計算出DEM每個網(wǎng)格點的溫度后，采用基于天線方向圖的方法對亮溫進(jìn)行歸一化，得到了和微波輻射計同時刻、同區(qū)域的模擬亮溫。針對Hercules坑的實測微波數(shù)據(jù)在白天和夜晚都出現(xiàn)較大波動的現(xiàn)象，模擬了Hercules坑在這兩個時刻的亮溫，還驗證了平坦區(qū)域的亮溫變化情況。結(jié)果表明：模擬亮溫的變化趨勢總體上和實測亮溫相符合，，從而直接證明了地形能夠?qū)α翜卦斐奢^大影響。此外，本文對亮溫發(fā)射角和天線方向圖進(jìn)行了初步分析，并得到了一些結(jié)論。
[Abstract]:The thickness of lunar soil is one of the four important objectives of lunar exploration. It is necessary to establish an accurate bright temperature model of microwave radiation for retrieving the thickness of lunar soil. In this paper, the development process of lunar soil radiative transport model and the important factors affecting the brightness temperature, such as topography, adjacent slope scattering and micro-scale roughness, are discussed in detail. By using the same orbit characteristic of Chang'e 1 CCD image and radiometer, an important terrain factor is added, which can theoretically simulate the bright temperature at any position and at any time on the moon surface, and can be compared directly with the measured data of microwave radiometer. This is the most striking difference between the new model and the previous bright temperature model. In order to make use of CCD images scanned in the same orbit with microwave radiometer to generate demm, this paper first introduces the process of 3D modeling based on three-line CCD images. Taking the Hercules impact crater as an example, it is found that there are two kinds of gross errors in Dem. The characteristics and causes of these two gross errors are discussed. The local affine transformation is proposed to suppress the gross error clusters and the corner cone method is used instead of the classical solution method to suppress the gross error lines. Finally, the contour information of the impact crater in Dem is well reflected by the effective solar irradiance image, the accuracy of the modified Dem is proved to be greatly improved by comparison, and some preliminary conclusions about the gross error line are obtained. After getting Dem, the effective solar irradiance can be calculated by terrain correction and masking, and it is proved by an example that topographic correction can cause local enhancement and local attenuation of irradiance, and the shaded area is in good agreement with CCD image. Then the iterative stability condition of the heat conduction equation is analyzed and a new adaptive stratification method is proposed to solve the problem that the current heat conduction equation is not suitable for any lunar soil thickness. In order to compare with the measured data, after calculating the temperature of each grid point of Dem, the method based on antenna pattern is used to normalize the brightness temperature, and the simulated bright temperature at the same time as the microwave radiometer is obtained. Aiming at the phenomenon that the observed microwave data of Hercules crater fluctuate greatly during day and night, the light temperature of Hercules crater at these two times is simulated, and the variation of light temperature in flat region is verified. The results show that the variation trend of simulated brightness temperature is consistent with the measured light temperature in general, which directly proves that the topography can have a great influence on the light temperature. In addition, the light temperature emission angle and antenna pattern are preliminarily analyzed and some conclusions are obtained.
【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】：2012
【分類號】：P184.53

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本文編號：2047549