摘要
为评估地球杂散辐射对地球临边、深空背景探测类空间光学遥感器成像的影响,指导遥感器杂光抑制设计,对地球杂散辐射进行了建模分析。基于辐射学理论,建立了地表球冠杂散辐射模型,给出了卫星任意位置时对其光学载荷杂光有贡献的地表球冠区域,并采用区域网格化,小面元积分的方法求解地球总的杂散辐射。小面元的辐射能量包括透过大气的地物能量、大气自发辐射能量、大气对太阳辐射的后向散射能量,为准确表征,根据卫星参数建立了小面元的经纬度模型、太阳矢量模型来计算其太阳照射几何,结合卫星观测几何、地表参数、大气参数等,通过大气辐射传输模型仿真求得。以某空间遥感器可见光及长波红外谱段为例,从星下点位置、时间、载荷视轴指向等各维度进行了地球杂散辐射仿真分析。
Objective Target detection with earthlimb and deep space background is an important imaging method for spaceborne optical remote sensors,which can effectively reduce the impact of earth stray radiation.It is widely used in weak target detection,such as mid-course warning of ballistic missile,space target monitoring,and astronomical detection.Usually,the earth is controlled outside the field of view of sensors,but the earth stray light will still reach the focal plane through the non-imaging optical path,which will affect the detection of targets.The earth radiation received by a remote sensor includes earth surface energy through the atmosphere,atmospheric spontaneous radiation energy and atmospheric backscattering energy of solar radiation.The earth radiation is related to the types of ground objects,atmospheric conditions,observational geometry,and the geometry of the sun.Due to its complexity,the stray light analysis software has not been able to accurately analyze the influence of earth stray light.In order to evaluate the influence of the earth stray radiation and guide the stray light suppression design of remote sensors,the earth stray radiation is modeled and analyzed.Methods Based on the radiation theory,the radiation model of earth spherical crown is established,and the spherical cap region that contributes to its optical payload stray light at any satellite position is given.The total stray radiation of earth is solved using the method of region meshing and small facet integration(Fig.1).The radiation energy of a small facet includes surface energy passing through the atmosphere,atmospheric spontaneous radiation energy,and atmospheric backscattered energy of solar radiation.For accurate characterization,a latitude longitude model and a solar vector model of small facets are established based on satellite parameters to calculate their solar irradiation geometry(Fig.3-4).Combined with the satellite observation geometry,surface parameters and atmospheric parameters,etc.,the radiance is obtained using the
作者
王浩
马文坡
张倩
晋利兵
王思恒
陈明
Wang Hao;Ma Wenpo;Zhang Qian;Jin Libing;Wang Siheng;Chen Ming(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;China Academy of Space Technology,Beijing 100094,China;PLA No.32011,Beijing 100094,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2023年第10期324-331,共8页
Infrared and Laser Engineering
关键词
地球杂散辐射
地球临边探测系统
深空背景探测系统
杂光抑制
earth stray radiation
earthlimb detection system
deep space background detection system
stray light suppression
