月壤厚度及介電常數(shù)反演研究
[Abstract]:The microwave detector (CELMS) carried by Chang 'e-1 lunar probe satellite is the first passive probe to observe the moon in lunar orbit in the world. CELMS has four working frequencies: 3.07.819.35 and 37GHz. The characteristics of lunar soil are studied by multi-channel microwave radiation bright temperature. It is one of the important tasks to retrieve the distribution of lunar soil thickness on the whole lunar surface. During orbit operation, CELMS has obtained a large amount of microwave bright temperature data, which basically covers the whole month. The analysis of CELMS observation data will be helpful for researchers to obtain the information of lunar soil thickness, topography, mineral content and so on, which is of great significance to human lunar exploration. Based on the model of bright temperature of lunar soil radiated by microwave radiation established by (HUST) in Huazhong University of Science and Technology, this paper analyzes the influence of parameter selection on the simulated brightness temperature, and simulates and calculates the bright temperature of microwave radiation in the whole month. The results are compared with the measured microwave brightness temperature data by CELMS. Based on the data of microwave brightness temperature measured by CELMS, the variation trend of bright temperature in the whole month is analyzed. Because there is a certain gap between the calculated brightness temperature and the measured light temperature, the method of statistical analysis is used to deal with the measured brightness temperature data. The relationship between the equivalent emissivity of the subsurface and the thickness of the lunar soil and the measured brightness temperature is obtained by using the simplified model. The thickness distribution of the whole lunar soil is basically reasonable, and the thickness of the retrieved lunar soil is close to that reported in the literature. Based on the accurate multilayer forward transmission model, the functional relationship between the monthly surface dielectric constant and the radiant light temperature of lunar soil is constructed. It is found that the simulated brightness temperature at midnight in 37G channel is close to the measured brightness temperature data. By using the constrained optimization search method, the 12:00 simulation at midnight and the measured brightness temperature, the monthly surface permittivity of the whole month is presented in this paper. The inversion results are close to the results given in the literature.
【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】:P184.63
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