利用嫦娥二号微波辐射计数据的全月亮温制图
Distribution of Microwave Radiation Brightness Temperatures on the Lunar Surface Based on Chang'E-2 MRM Data
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摘要: 中国嫦娥绕月卫星在世界上首次搭载了微波辐射计,用于获取不同深度月壤的微波辐射亮温,而这正是月壤厚度研究和月壤表层参数信息反演的基础。基于嫦娥二号的微波辐射计2C级数据,建立4个频率通道(3.0、7.8、19.35、37.0GHz)在不同纬度下的亮温日变化模型,并通过该模型对亮温数据进行时角校正,得到了正午时刻的全月微波亮温图。结合CCD影像和DEM数据比较的结果表明,处理后的亮温数据很好地反映了月球的地形特征及月表的反射率信息。基于高频的亮温数据对月球亮温异常区域进行了分析,发现其都是哥白尼纪的新鲜撞击坑。Abstract: TheChineseChang’Elunarroverwasequippedwithapassivemicrowaveradiometer(MRM)tomeasureforthefirsttimethebrightnesstemperaturefromthelunarsurface.Thebright nesstemperatureisthebaseofinversionoflunarregoliththicknessandlunarregolithparameters.BasedonMRM2C leveldatafromChang’E 2,themodelsofdiurnalvariationofthebrightnesstem peratureinthefourchannelsareestablishedseparatelyatdifferentlatitudes.Basedonthesemodels,microwavemapsofthemoonwereconstructedusinghouranglecalibration.Theresultswerecom binedwithacomparisonofCCDimagesandDEMdatashowingthatbrightnesstemperaturedatacom mendablyreflectsthelunarterraincharacteristicsandlunarsurfacereflectivity.Abnormalareasoflu narbrightnesstemperaturebasedonbrightnesstemperaturedatawereanalyzedathighfrequency,whichshowsthatallarefreshimpactcratersfromtheCopernicanperiod.
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