“高分四号”卫星凝视相机视频电路设计与实现

Design and Implementation of Staring Camera Video Circuit on GF-4 Satellite

"高分四号"卫星是中国首颗地球静止轨道遥感卫星,其携带的凝视相机系统能够实现在36 000km的地球静止轨道拍摄到50m分辨率的图像信息。高轨道、高分辨率光学拍摄任务所带来的问题是,面阵CMOS图像传感器模块将以极快的速度产生大量的并行图像数据。这对以CMOS图像传感器模块为核心的视频电路提出了更高的要求。而传统的视频电路设计方法不仅会产生一些信号完整性问题,且并不能完全适用于基于这种大数据量的面阵CMOS图像传感器模块的视频电路设计。文章通过仿真分析和实验验证,对比常规的设计方法,结合CMOS图像传感器模块的特点和输入输出特点,对基于这种面阵CMOS图像传感器模块的相机视频电路提出了新的设计方案,并证明了文章所提出的设计方案正确可行,且效果优于常规的设计方案。文章提出的设计方案已成功应用在"高分四号"卫星,在要求日趋复杂的遥感领域亦有广阔的应用前景。

GF-4 satellite is the first China＇s GEO remote sensing satellite, whose camera system can obtain 50m resolution image information from a 36 000km GEO. An area array CMOS image sensor module quickly generates a large number of parallel data, which puts forward higher requirements for video circuit that is the core of an image sensor module. The traditional design method is unable to produce signal integrity, and not suitable for the higher requirements. In this paper, through simulation analysis and experimental verification, by comparison with the conventional design method and according to sensor module characteristics and input and output characteristics, an area array CMOS image sensor camera video circuit is advanced based on the proposed new design scheme. It is proved correct and feasible, and better than the conventional one. The proposed approach has been successfully applied in GF-4 satellite and has wide application prospect in the remote sensing field where the requirements are increasingly complicated.