星载差分吸收光谱仪 CCD 成像电路的设计及实施

摘要

Satellite-borne DOAS(Differential Optical Absorption Spectroscopy)spectrometer utilizing 4 array CCDs can monitor the spectrum of atmosphere in real-time.In this spectrometer,the CCD imaging circuit is the core of elec-tronic device.The circuit has general functions of CCD imaging circuit,and uses “4-in-1 ”and “digital binning”schemes aiming at the space limitation of satellite and the supplies of aerospace components.In this article,the design and implementation of the circuit is described,and the characteristics of the “4-in-1 ”and “digital binning”schemes are mainly discussed.%星载差分吸收光谱仪通过获取地球大气或地表反射、散射的紫外／可见光辐射，监测大气痕量气体的全球分布。载荷使用4片面阵 CCD 作为探测器，对地观测、实时测量紫外可见波段光谱信息。其中 CCD 成像电路是电子学部件的核心，该电路的设计除完成通用 CCD 成像电路功能以外，还针对卫星空间有限和航天元件受限等特殊情况，采用了单板四通道、数字像元合并的方案。本文讨论了载荷 CCD 成像电路的设计实施过程，并重点论述了单板四通道和数字像元合并的设计特点。