FY-3气象卫星可见光红外扫描辐射计冷空间基准采样区观测到月球后的现象

The phenomena of lunar observation in cold space reference sampling area of Visible and Infrared Radiometer on FY-3 Meteorological Satellite

FY-3气象卫星可见光红外扫描辐射计(VIRR)冷空间基准采样区在特定时刻观测到月球,使该时刻遥感图像出现地球区信号码值减小甚至无码值的条带状异常区域,对遥感数据产生影响。根据VIRR轨道运行特点、在轨工作模式和冷空间数据采样机理,分析了VIRR冷空间采样区观测到月球并影响遥感数据的原因,阐述了VIRR扫描镜像旋转引起冷空间采样时月球图像通道间配准错位的机理,通过卫星轨道仿真计算了一年周期内出现此种现象的时间及规律,对受影响的遥感数据提出了处理建议,对数据修正作了初步尝试并对数据修正的可能性作了分析。

The moon is observed at a specific time in the cold space reference sampling area of the visible infrared radiometer(VIRR)of FY-3 meteorological satellite,which makes the remote sensing image appear abnormal area of strip image with reduced or even no code value in the earth region at that time,which has an impact on the remote sensing data.Based on the characteristics of VIRR orbit operation,on orbit working mode and cold space data sampling mechanism,this paper analyzes the reasons why the moon is observed in the cold space sampling area of VIRR and affects the remote sensing data.The mechanism of registration dislocation between lunar image channels caused by the rotation of VIRR scanning image in cold space sampling is expounded.The time and regularity of this phenomenon in one year period are calculated by satellite orbit simulation.The processing suggestions for the affected remote sensing data are put forward.The preliminary attempt of data correction is made and the possibility of data correction is analyzed.