Influence factors on SNR of TDICCD space camera

LIU Ze-xun; WAN Zhi; LI Xian-sheng; LI Bao-yong; SHAO Ya-rong

doi:10.3788/OPE.20152307.1829

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Influence factors on SNR of TDICCD space camera

更新时间：2020-08-12

- Influence factors on SNR of TDICCD space camera
- Optics and Precision Engineering Vol. 23, Issue 7, Pages: 1829-1837(2015)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152307.1829
  CLC： V447.3;V416.6
- Received：20 March 2015，
  
  Revised：27 April 2015，
  
  Published：25 July 2015
- 稿件说明：
移动端阅览
刘则洵, 万志, 李宪圣等. 时间延迟积分CCD空间相机信噪比的影响因素[J]. 光学精密工程, 2015,23(7): 1829-1837

LIU Ze-xun, WAN Zhi, LI Xian-sheng etc. Influence factors on SNR of TDICCD space camera[J]. Editorial Office of Optics and Precision Engineering, 2015,23(7): 1829-1837
刘则洵, 万志, 李宪圣等. 时间延迟积分CCD空间相机信噪比的影响因素[J]. 光学精密工程, 2015,23(7): 1829-1837 DOI： 10.3788/OPE.20152307.1829.

LIU Ze-xun, WAN Zhi, LI Xian-sheng etc. Influence factors on SNR of TDICCD space camera[J]. Editorial Office of Optics and Precision Engineering, 2015,23(7): 1829-1837 DOI： 10.3788/OPE.20152307.1829.

摘要

为了定量评估影响时间延迟积分(TDI)CCD空间相机信噪比的因素

研究了TDICCD空间相机成像机理和噪声来源

建立了相机的信噪比模型。分析了辐射亮度、积分级数、行频和系统增益(模拟增益)对信噪比的影响。搭建了实验室辐射定标系统

模拟了相机在轨工作时的辐射亮度条件。通过辐射定标对不同工作参数与相机信噪比的关系进行了验证。结果表明:对于TDICCD相机来说

光子散粒噪声、暗电流噪声和固定图形噪声在诸多噪声中起主导作用。相机的输出信号和信噪比均随着辐射亮度、积分级数和系统增益的增加而增大

随着行频的增加而减小。辐射亮度、积分级数、行频和系统增益对信噪比的影响量不同。具体来说

即当辐射亮度、积分级数和行频变化量分别为

倍、

倍时

其导致的信噪比变化量略大于

1/2

倍、

1/2

倍、

-1/2

倍。系统增益只能在相对较小的范围内影响信噪比

且信噪比变化幅度随着增益的提高逐渐减小。

Abstract

To quantitatively assess factors affecting the Signal to Ratio(SNR)of a Time Delay Integration(TDI)CCD camera

the imaging principle and noise sources of the TDICCD space camera were researched and a SNR model was established. The effects of the radiance lightness

integration stages

line transfer frequency and the system gain(analog gain)on the SNR were analyzed. A laboratory radiation calibration system was established to simulate the on-orbit radiance conditions of the camera. The relationship between the SNR and different working parameters were verified by radiation calibration. The calibration results show that the photon shot noise

dark current noise and the fixed pattern noise play a major role in all kinds of noise. The output signal and the SNR of the camera increase with the raises of the radiance

integration stages and the system gain and decrease with the raise of the line transfer frequency. The varieties of these factors have different influences on the SNR. Specifically

when the variations of the radiance

integration stages and the line transfer frequency are respectively

times

times and

times

the variations of the SNR are slightly larger than

1/2

times

1/2

times

-1/2

times

respectively. Moreover

the influence of the system gain on the SNR is in a relatively small range and the variation of the SNR decreases gradually with the raise of the system gain.

关键词

Keywords

references

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