The modeling analysis of microwave emission from stratified media of non-uniform lunar cratered terrain surface for Chinese Chang-E1 observation  

作　　者：JIN YaQiu FA WenZhe 

机构地区：[1]Key Laboratory of Wave Scattering and Remote Sensing Information (MOE), Fudan University, Shanghai 200433, China

出　　处：《Chinese Science Bulletin》2011年第11期1165-1171,共7页

基　　金：supported by the National Natural Science Foundation of China(60971091,40637033);the State Key Laboratory of Remote Sensing Science(2009KFJJ011)

摘　　要：In China's first lunar exploration project,Chang-E 1,the multi-channel (3.0,7.8,19.35,37 GHz) microwave radiometers were aboard the satellite,with the purpose of measuring microwave brightness temperature from lunar surface and surveying the global distribution of lunar regolith layer thickness,and global evaluation of 3He content.To analyze the modeling of microwave radiative transfer from three-layered media of lunar surface,some factors,such as the cratered lunar surface roughness,scattering of regolith particulate medium with temperature profile,are discussed.Based on the statistics of the lunar cratered terrain and using Monte Carlo (MC) method,the cratered lunar surfaces are numerically generated.The triangulated network is utilized to divide the undulated lunar surface into discrete triangle meshes with the size 10 m as a digital surface topography.The reflectivities of each plane mesh are calculated,and the average reflectivity for all MC-realized lunar surfaces is obtained.It is found that under the spatial resolution of 30 km×30 km of Chang-E 1 radiometer observation,the lunar surface can be well modeled as a flat surface.It makes the predominance of the parameters,such as the regolith layer thickness and stratified structures,to be studied.Using the radiative transfer equation of stratified media with dense scatterers,the scattering coefficient of the regolith particulate medium is found negligible,and the emission is mainly governed by the absorptive property of the medium.Brightness temperature of multi-layered media,i.e.lunar soil,regolith layer with temperature profile and underlying rock media,are derived and calculated,and relevant main factors to affect the modeling and emission simulation are analyzed.In China＇s first lunar exploration project, Chang-E 1, the multi-channel （3.0, 7.8, 19.35, 37 GHz） microwave radiometers were aboard the satellite, with the purpose of measuring microwave brightness temperature from lunar surface and surveying the global distribution of lunar regolith layer thickness, and global evaluation of 3He content. To analyze the modeling of microwave radiative transfer from three-layered media of lunar surface, some factors, such as the cratered lunar surface roughness, scattering of regolith particulate medium with temperature profile, are discussed. Based on the statistics of the lunar cratered terrain and using Monte Carlo （MC） method, the cratered lunar surfaces are numerically generated. The triangulated network is utilized to divide the undulated lunar surface into discrete triangle meshes with the size 10 m as a digital surface topography. The reflectivities of each plane mesh are calculated, and the average reflectivity for all MC-realized lunar surfaces is obtained. It is found that under the spatial resolution of 30 kmx30 km of Chang-E 1 radiometer observation, the lunar surface can be well modeled as a flat surface. It makes the predominance of the parameters, such as the regolith layer thickness and stratified structures, to be studied. Using the radiative transfer equation of stratified media with dense scatterers, the scattering coefficient of the regolith particulate medium is found negligible, and the emission is mainly governed by the absorptive property of the medium. Brightness temperature of multi-layered media, i.e. lunar soil, regolith layer with temperature profile and underlying rock media, are derived and calculated, and relevant main factors to affect the modeling and emission simulation are analyzed.

关 键 词：月球探测工程 微波发射 分层介质 地形表面 陨石坑 模型分析 中国 非均匀 

分 类 号：P184.5[天文地球—天文学]