摘要
为了提高遥感成像系统的调制传递函数(MTF),需要解决由于地面景物和CCD电荷移动不匹配带来的像移问题。在工程应用中,通常采用连续转移模式的电子补偿方法来解决这种问题。但是,当CCD工作在连续转移模式下时,会导致遥感图像中出现暗(亮)线,而且这种暗(亮)线会随着积分时间的变化而变化,在后期的图像校正中无法消除。针对此图像串扰问题,文章对串扰产生机理、串扰模式以及串扰因素的边界条件进行了分析。通过分析得出可通过调整时序驱动信号的上升/下降时间来降低图像串扰。在此基础上,文章提出了一种驱动滤波电路的硬件解决方案;然后,根据某工程应用CCD,文章对此电路进行了仿真与试验;通过对多组试验数据的对比分析,可知此驱动电路方案可根据需要调整上升/下降时间,从而实现降低图像串扰的目的。对图像数据进行分析后,文章提出将上升时间设置为时序信号周期的1/10,可将图像串扰降低到工程应用可接受的程度。
In order to improve the MTF of remote sensing imaging system, it’s necessary to solve the image shift problem caused by the mismatch between ground scene and CCD charge movement. In engineering applications, the electronic compensation method in continuous transfer mode is usually adopted to solve this problem. However, when the CCD works in the continuous transfer mode, it will lead to dark (or bright) lines in remote sensing images, which will change with the integration time variation, and cannot be eliminated in the later image correction. Aiming at image crosstalk problem, the mechanism mode and boundary conditions are analyzed. Through analysis, it is concluded that image crosstalk can be reduced by adjusting the rising/falling time of timing driving signals. On this basis, a hardware solution of driving filter circuit is proposed. Then, for a CCD in engineering application, the circuit is simulated and tested. Through the comparison of multiple experimental data, it can be seen that the driving circuit scheme can adjust the rising/falling time accordingly, thus reducing image crosstalk. After analyzing the image data, the paper proposes to set 1/10 of the time series signal period as the rising time, which can reduce the image crosstalk to an acceptable level in engineering application.
作者
申才立
梁楠
李鑫
龚敬
韩志学
董龙
SHEN Caili;LIANG Nan;LI Xin;GONG Jing;HAN Zhixue;DONG Long(Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China)
出处
《航天返回与遥感》
CSCD
2019年第5期50-57,共8页
Spacecraft Recovery & Remote Sensing
基金
国家重点研发计划地球观测与导航重点专项（2016YFB0500802）
关键词
电荷耦合器件
调制传递函数
突发转移
连续转移
图像串扰
航天遥感
charge coupled device
modulation transfer function
abrupt transfer
sequential transfer
image crosstalk
space remote sensing
作者简介
申才立,男,1988年出生,2015年获得中国空间技术研究院飞行器设计专业硕士学位,工程师。研究方向为航天遥感电子技术。E-mail:357370654@qq.com。
