全局快门在对地观测的超光谱成像、测绘及星敏应用中具有优势，但应用效果也依赖于高信噪比。针对CMOS成像特点，设计了可进行拉灌电流的低压基准源电路，基于低热光学变形的焦面电子学，提出上电初始态不定的多通道串行数据接收方法；针对全局快门所特有的寄生光灵敏度影响，采用分行统计中间行为基准的多点拟合校正方法；按照EMVA1288标准，将前照式CMOS成像系统与制冷背照式EMCCD进行了测试，校正前后单幅图像的标准差分别为3.37和0.42，最大信噪比为123.37，EMCCD的最大信噪比为359.43。结果表明，该校正方法可有效减弱全局快门的固定图形噪声，面阵CMOS在全局快门方式下的信噪比与EMCCD相比还有较大差距。

Global shutters have advantages in hyperspectral imaging, mapping, and star-sensing applications for Earth observation, but their application effects also depend on high signal-to-noise ratios. According to the characteristics of CMOS imaging, a low-voltage reference source circuit capable of sourcing and sinking current and a focal plane electron with low thermal distortion are designed. A method of receiving multi-channel serial data with uncertain initial state of power-on is proposed.According to the influence of the parasitic light sensitivity unique to the global shutter, the multi-point fitting correction method based on line-by-line counting and taking the middle line as the reference is adopted.The front-illuminated CMOS imaging system and cooled back-illuminated EMCCD are tested according to EMVA1288 standard.The standard deviation of the single image before and after calibration is 3.37 and 0.42 respectively, the maximum SNR is 123.37, and the maximum SNR of the EMCCD is 359.43. The results show that the correction method can effectively reduce the fixed pattern noise of the global shutter. There is a big gap between the SNR of the area array CMOS in the global shutter mode and that of EMCCD.