FY-2C星云图成像技术

介绍了风云二号(FY-2)气象卫星星上成像系统的主要功能和技术指标、云图的生成与传输,以及数传与转发技术.阐述了以太阳为基准采用星上预同步、地面同步/数据缓冲器(S/DB)进行精同步的同步成像技术的卫星成像系统设计原理.分析了卫星姿态动力学对自旋轴定向稳定的影响、扫描辐射计扫描机构步进对自旋周期稳定度的影响、卫星摇摆运动造成的云图几何畸变等产生成像误差的因素,以及采取的补偿修正方案.飞行试验结果表明,C星的云图网格配准精度优于1个可见像素,章动角和摇摆角也符合设计要求.

Clouds Imaging Technology for FY-2C Meteorological Satellite

The major functions and performances of on-board imaging system,forming and transmitting of clouds image,and its data transmission and retransmission for FY-2 meteorological satellite were introduced in this paper.The principle of on-board pre-synchronization and ground precision synchronization by synchronization/data buffer based on solar reference that used in imaging system design was described.The imaging errors such as the effect of the satellite attitude dynamics on the directional stabilization of the spin axis,the effect of the scanning unit step of the scanning radiometer on the spin cycle stabilization,and clouds image distortion caused by the satellite swing motion as well as the relative compensation measures were presented.The on-orbit result showed that the gird registration of clouds imaging for FY-2C satellite was better than 1 visible pixel,and the nutation angle and swing angle met the requirements for design.