航天TDICCD相机谱间串扰分析与处理  

Spectral Crosstalk Analysis and Processing for Aerospace TDICCD Camera

作　　者：曹金彦 贺小军 陈茂胜 张雷 钟兴 于树海 白芸 邹吉炜 CAO Jinyan;HE Xiaojun;CHEN Maosheng;ZHANG Lei;ZHONG Xing;YU Shuhai;BAI Yun;ZOU Jiwei(Chang Guang Satellite Technology Co.,Ltd.,Changchun 130000,CHN)

机构地区：[1]长光卫星技术股份有限公司,长春130000

出　　处：《半导体光电》2024年第6期953-959,共7页Semiconductor Optoelectronics

摘　　要：为提高航天TDICCD遥感相机的信噪比和成像质量,对TDICCD遥感相机成像谱段间相互串扰进行了深入研究。在高密TDICCD成像电路设计过程中,由于PCB电路板空间有限且布局布线密集,导致信号间隔离度不足,引起谱段间信号相互串扰。这种串扰会严重影响各个谱段有效信号的采集,当各谱段工作频率不同时,图像即产生明显的串扰条纹。文章首先根据信号处理流程介绍了成像系统的组成,给出两种串扰现象;然后,分析串扰产生原因及其边界条件,并给出成像串扰抑制的方案;最后,对改进后的TDICCD成像系统进行成像和信噪比测试。实验结果表明,采取的措施有效地去除了TDICCD成像谱间串扰条纹,相机信噪比得到了显著的提高,在相机辐亮度为133.729 W/(m^(2)×Sr)的条件下,相机信噪比提高了6.92 dB,达到了47.83 dB,满足实际工程的需求。To improve the signal-to-noise ratio and imaging quality of aerospace TDICCD remote sensing cameras,in-depth research was conducted on the crosstalk between the imaging spectral bands of TDICCD remote sensing cameras.In the design process of high-density TDICCD imaging circuits,owing to the limited space,dense layout,and wiring of PCB circuit boards,the isolation between signals is unsatisfactory,thus resulting in crosstalk between the spectral bands of the signals.This type of crosstalk significantly affects the acquisition of effective signals in various spectral bands.Under different operating frequencies of each spectral band,crosstalk stripes are generated in the image.This article first introduces the composition of an imaging system based on signal processing and describes two types of crosstalk phenomena.Subsequently,the causes of crosstalk and its boundary conditions are analyzed,and a solution for suppressing imaging crosstalk is provided.Finally,imaging and signal-to-noise ratio testing are conducted on an improved TDICCD imaging system.The experimental results show that the measures adopted effectively removed the crosstalk stripe between the TDICCD imaging spectral bands as well as significantly improved the camera signal-to-noise ratio.Under a camera radiance of 133.729 W/(m^(2)×Sr),the camera signal-to-noise ratio increased by 6.92 dB to 47.83 dB,thus satisfying the demands of practical engineering.

关 键 词：谱间串扰 信号隔离 串扰抑制 信噪比 成像系统 

分 类 号：TN386.5[电子电信—物理电子学]