卷帘数字域TDI技术的CMOS成像系统的SNR模型建立
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摘要
为使采用数字域时间延时积分(TDI)技术的空间高分辨率成像系统的信噪比(SNR)指标能够在前期论证过程中被准确的评估出来,提出了基于该技术的信噪比评估模型。首先分析了卷帘数字域时间延时积分(TDI)技术的工作机理,然后对基于CMOS图像传感器的成像系统的主要噪声进行了详细分析,提出了基于卷帘数字域TDI技术的CMOS成像系统的SNR模型,最后利用设计的基于国产CMOS图像传感器的空间光学相机的辐射定标实验结果验证SNR模型的正确性。实验数据表明采用提出的SNR模型算出的信噪比与图像中计算得到的信噪比在入瞳辐亮度在27.1044-5.5117,SNR范围内理论值和实验值之间的差值在2.1d B以内。而对于只有在白天进行成像的光学系统来说,其入瞳辐亮度不会超出这个范围。
In the Pre-demonstration process of Space High Resolution Imaging System using Digital domain time delay integration technology,its signal-to-noise ratio(SNR) indicator can be accurately evaluated during this phase. In the paper,a signal-to-noise ratio evaluation model based on rolling digital domain TDI technology was proposed. Firstly,the working mechanism of rolling digital time domain delay integration(TDI) technology was analyzed. Then,the main noise of imaging system based on CMOS image sensor was analyzed in detail. The SNR model of CMOS imaging system based on digital domain TDI technique was proposed. Finally,the correctness of the SNR model was verified by the experimental results of the radiation calibration of a space optical camera based on a domestic CMOS image sensor.The experimental data show that the difference of the result calculated by the proposed SNR model and the result calculated by images was less than 2.1 d B when entrance pupil radiance was between 27.1044 and 5.5117. And for optical systems that only image during the day,its entrance pupil radiance can not beyond the range.
In the Pre-demonstration process of Space High Resolution Imaging System using Digital domain time delay integration technology,its signal-to-noise ratio(SNR) indicator can be accurately evaluated during this phase. In the paper,a signal-to-noise ratio evaluation model based on rolling digital domain TDI technology was proposed. Firstly,the working mechanism of rolling digital time domain delay integration(TDI) technology was analyzed. Then,the main noise of imaging system based on CMOS image sensor was analyzed in detail. The SNR model of CMOS imaging system based on digital domain TDI technique was proposed. Finally,the correctness of the SNR model was verified by the experimental results of the radiation calibration of a space optical camera based on a domestic CMOS image sensor.The experimental data show that the difference of the result calculated by the proposed SNR model and the result calculated by images was less than 2.1 d B when entrance pupil radiance was between 27.1044 and 5.5117. And for optical systems that only image during the day,its entrance pupil radiance can not beyond the range.
引文
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[7]罗一涵,刘妍妍,陈科.探测信噪比计算方法及原理综述[J].电声技术,2016,40(06):37-43+57.
[8]丁坤,CMOS图像传感器光生电荷转移效率模拟研究[D].哈尔滨:哈尔滨工程大学,2015.
[9]胡亚东,胡巧云,孙斌,等.暗电流对短波红外偏振测量精度的影响[J].红外与激光工程,2015,44(08):2375-2381.
[10]陶淑苹,金光.卷帘快门对数字域TDI成像的影响分析[J].光学学报,2015,35(03):107-112.
[11]金光,宋明珠,张贵祥,等.数字域斜模态时间延迟积分技术[J].液晶与显示,2017,32(08):628-634.
[12]何春良,李斌桥,刘振旺,等.TDI CMOS图像传感器曝光时间优化方法研究[J].光学学报,2015,35(02):34-40.
[13]袁航飞.航天相机星上自适应调光的研究[D].长春:长春光学精密机械与物理研究所,2016.
[14]刘彦飞,代永红,单欣,等.高帧频CMOS相机对光通信精跟踪系统影响分析[J].仪器仪表学报,2015,36(06):1319-1325.
[15]鲁溟峰,倪国强,白廷柱,等.基于分数阶傅里叶变换的量化噪声抑制方法[J].北京理工大学学报,2015,35(12):1285-1290.
[16]刘智,薛旭成,郝志航.基于USB总线的CMOS数字像机技术研究[J].长春理工大学学报:自然科学版,2004(01):5-8.