空间遥感相机TDI CCD积分级数和增益的优化设置

薛旭成; 石俊霞; 吕恒毅; 马天波; 郭永飞

doi:10.3788/OPE.20111904.0857

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空间遥感相机TDI CCD积分级数和增益的优化设置

信息科学 | 更新时间：2020-08-12

- 空间遥感相机TDI CCD积分级数和增益的优化设置
- Optimal set of TDI CCD integration stages and gains of space remote sensing cameras
- 光学精密工程 2011年19卷第4期页码：857-863
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
  2. 中国科学院研究生院北京,100039
- 作者简介：
- 基金信息：
  
  中科院国防创新基金资助项目()
- DOI：10.3788/OPE.20111904.0857
  中图分类号： V475.3;TN386.5
- 收稿日期：2010-11-26，
  
  修回日期：2011-02-15，
  
  网络出版日期：2011-04-26，
  
  纸质出版日期：2011-04-26
- 稿件说明：
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薛旭成, 石俊霞, 吕恒毅, 马天波, 郭永飞. 空间遥感相机TDI CCD积分级数和增益的优化设置[J]. 光学精密工程, 2011,19(4): 857-863

XUE Xu-cheng, SHI Jun-xia, L Heng-yi, MA Tian-bo, GUO Yong-fei. Optimal set of TDI CCD integration stages and gains of space remote sensing cameras[J]. Editorial Office of Optics and Precision Engineering, 2011,19(4): 857-863
薛旭成, 石俊霞, 吕恒毅, 马天波, 郭永飞. 空间遥感相机TDI CCD积分级数和增益的优化设置[J]. 光学精密工程, 2011,19(4): 857-863 DOI： 10.3788/OPE.20111904.0857.

XUE Xu-cheng, SHI Jun-xia, L Heng-yi, MA Tian-bo, GUO Yong-fei. Optimal set of TDI CCD integration stages and gains of space remote sensing cameras[J]. Editorial Office of Optics and Precision Engineering, 2011,19(4): 857-863 DOI： 10.3788/OPE.20111904.0857.

摘要

为了提高空间TDI CCD遥感相机的成像质量

研究了相机TDI CCD积分级数和增益的优化设置方法。分别讨论了信噪比(SNR)和调制传递函数(MTF)与积分级数的关系

指出增加积分级数能解决光能量不足问题并有效提高SNR

但同时会引起系统MTF下降;增加增益也可解决光能量不足问题

但不能改变系统的SNR和MTF

因此优化积分级数和增益可改善图像质量。采用SNRMTF作为图像质量评价指标

对积分级数和增益设置进行了优化。数值计算结果表明:在给定的相机参数下

当卫星俯仰角速度为0.005 ()/s

曝光量为饱和值的1/66时

积分级数选为44级

增益设置为1.5可获得较好的图像质量。

Abstract

In order to improve the image quality of the space TDI CCD remote sensing cameras

the method to set optimally of TDI CCD integration stages and gains was proposed. The dependence of the Signal to Noise Ratio(SNR) and Modulation Transfer Function(MTF) on the integnation stages was discussed.Then

it points out that increasing integration stages can resolve the lack of exposure light energy and improve SNR

but it causes the image MTF reduced. However

increasing gains can also resolve the problem of lack of exposure light

and it makes the SNR and the imaging MTF unchanged. These results means that the set of the SNR and imaging MTF can improve the image quality. By using the SNRMTF as the optimal goal

this paper optimizes the integration stage and the gain. Numerical calculation result shows that when the pitch speed of satellite is 0.005/s and the exposure is 1/66 of saturation

the high quality image can be obtained in the integration stage to be 44 and the gain to be 1.5.

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Keywords

references

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