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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.中国科学院大学,北京 100049
[ "周鹏骥(1985-),男,黑龙江伊春人,博士研究生,助理研究员,2013年于电子科技大学获得硕士学位,主要从事空间遥感成像技术方面的研究。E-mail:zpj1029@163.com" ]
[ "王晓东(1970-),男,吉林白山人,研究员,博士生导师,2003年于中国科学院研究生院获得博士学位,主要从事空间光学遥感仪器成像技术与信息处理方面的研究。Email:wangxd@ciomp.ac.cn" ]
收稿日期:2021-08-18,
修回日期:2021-10-11,
纸质出版日期:2022-01-25
移动端阅览
周鹏骥,王晓东,董吉洪等.天问一号高分相机成像噪声分析与抑制[J].光学精密工程,2022,30(02):217-226.
ZHOU Pengji,WANG Xiaodong,DONG Jihong,et al.Imaging noise analyzing and suppressing for Tianwen-1 high-resolution camera[J].Optics and Precision Engineering,2022,30(02):217-226.
周鹏骥,王晓东,董吉洪等.天问一号高分相机成像噪声分析与抑制[J].光学精密工程,2022,30(02):217-226. DOI: 10.37188/OPE.20223002.0217.
ZHOU Pengji,WANG Xiaodong,DONG Jihong,et al.Imaging noise analyzing and suppressing for Tianwen-1 high-resolution camera[J].Optics and Precision Engineering,2022,30(02):217-226. DOI: 10.37188/OPE.20223002.0217.
在深空探测中,为了充分利用有限的空间和视场,提出了一台相机同时含有三片线阵TDI CCD思路。为了获得高分辨率、高信噪比的遥感图像数据,针对相机成像链路,分析了影响高分相机信噪比的关键因素,提出了成像系统的串扰模型,并针对各种影响要素提出了改进措施。首先,完全独立设计各个通道,减少通道间的电路耦合。其次,调整垂直转移驱动信号的时间常数,以减小TDI CCD芯片内部的串扰噪声。最后,通过三片探测器物理隔离,减小噪声的近场耦合。对天问一号高分相机进行辐射定标试验,试验结果表明:模拟火星轨道条件,在典型工况条件,太阳高角30度、地面反照率0.2时,TDI CCD全色谱段在积分级数为32级的情况下信噪比即可达到最高115.1倍,满足火星探测的指标要求。
In order to fully utilize the limited space and field of view in deep space exploration, a camera with three linear TDI CCD detectors is proposed. To acquire remote sensing images with high SNR and high-resolution, according to the chain of the imaging system, methods for analyzing the key factors that affect the SNR of high-resolution cameras as well as improvement measures are put forward. First, each channel is designed independently to reduce circuit coupling between channels. Then, the time-constant of the vertical transfer frequency is adjusted to reduce the crosstalk of the inner TDI CCD. Finally, the three detectors are physically isolated to reduce the near field coupling noise. The results of the radiation calibration experiment with the high-resolution camera in Tianwen-1 indicate that by simulating the orbital conditions of Mars, the SNR of the panchromatic spectrum is 115.1 when the integral number is 32, as the elevation angle of the sun is 30° and the surface albedo is 0.2. The results show that the design satisfies the criteria for Mars exploration.
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