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为满足基于月球辐射校正的内黑体绝对辐射定标对月球观测数据的需求,设计了FY-2卫星的动态月球观测模式,在新的工作模式下观测到了高质量的月球图像。为获取高质量的月球图像,根据FY-2卫星自旋稳定平台的特点,以及灵活的观域调整和区域扫描功能,重新设计了卫星工作时序,并更改了卫星地面控制系统软件,在卫星常规20°×20°视场外,拓展出了10°×20°的月球观测区域,实现了月球的动态追踪观测,实践证明,观测模型精度优于30 s;根据月球图像特点,设计了伪目标剔除算法,通过对目标位置、形态特性等条件自动判断实现了从卫星云图中自动、准确提取出月球图像的功能;根据月球在卫星视场里的动目标特性,以FY-2卫星自旋扫描成像的工作原理和具体的性能参数,计算得到了动目标的相对角速度,据此发展了动目标配准算法、消除了月球运动造成的变形和位移,实现了月球图像配准。工作获得了常规观测3倍数量的月球图像,有力地保障了FY-2卫星辐射定标性能,促进了遥感数据定量化应用。
In order to meet the lunar observation data based on the lunar radiative correction of internal blackbody absolute radiation calibration, a dynamic lunar observation model FY-2 was designed and a high quality lunar image was observed in the new working mode. In order to acquire high quality lunar images, the satellite working sequence was redesigned according to the characteristics of the FY-2 satellite spin stabilized platform, as well as the flexible field adjustment and area scanning functions. The satellite ground control system software was changed. 20 ° × 20 ° field of view, expanding the 10 ° × 20 ° lunar observation area to achieve the dynamic tracking of the moon, the practice proved that the observation model accuracy is better than 30 s; according to the characteristics of the lunar image, the design of the pseudo-target The algorithm removes the algorithm automatically and accurately extracts the lunar image from the satellite cloud image by automatically judging the target position and morphological characteristics. According to the characteristics of the moving target of the moon in the satellite field of view, the FY-2 satellite spin-scan The principle of imaging and the specific performance parameters are calculated, and the relative angular velocity of the moving target is calculated. Based on this, the moving target registration algorithm is developed to eliminate the deformation and displacement caused by the lunar movement and realize the lunar image registration. The work obtained three times the number of conventional observations of the lunar image, which effectively protected the FY-2 satellite radiation calibration performance and promoted the quantitative application of remote sensing data.