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.
QIU J W , WANG Q , MA J N . Deep space exploration technology(Invited) [J]. Infrared and Laser Engineering , 2020 , 49 ( 5 ): 3788 /IRLA20201001. (in Chinese)
WANG C , ZHANG X G , XU X F , et al . The lunar and deep space environment exploration in China [J]. Journal of Deep Space Exploration , 2019 , 6 ( 2 ): 105 - 118 . (in Chinese)
SUN X C , LÜ H Y , XUE X C , et al . Adaptive compensation technique for CCD signal sampling positions in high-resolution remote sensing cameras [J]. Opt. Precision Eng. , 2020 , 28 ( 4 ): 973 - 978 . (in Chinese)
SUN W , HAN C S , JIN X F , et al . HDR imaging method of overcoming full well limitation for push-broom remote sensing cameras [J]. Opt. Precision Eng. , 2018 , 26 ( 4 ): 944 - 950 . (in Chinese) . doi: 10.3788/OPE.20182604.0944 http://dx.doi.org/10.3788/OPE.20182604.0944
YU X Y . Opto-mechanical structure of imager with two field of views and multiple channels [J]. Opt. Precision Eng. , 2015 , 23 ( 10 ): 2870 - 2876 . (in Chinese) . doi: 10.3788/ope.20152310.2870 http://dx.doi.org/10.3788/ope.20152310.2870
LI J , JIN L X , HAN S L , et al . Test system for time-delayed integration charge coupled device of remote camera with wide field of view [J]. Infrared and Laser Engineering , 2012 , 41 ( 9 ): 2415 - 2423 . (in Chinese) . doi: 10.3969/j.issn.1007-2276.2012.09.031 http://dx.doi.org/10.3969/j.issn.1007-2276.2012.09.031
LI W X , XU S Y , YAN D J . Influencing parameters of estimate errors of space camera's drift angle [J]. Infrared and Laser Engineering , 2011 , 40 ( 8 ): 1530 - 1536 . (in Chinese) . doi: 10.3969/j.issn.1007-2276.2011.08.029 http://dx.doi.org/10.3969/j.issn.1007-2276.2011.08.029
CHANG Z , WANG Y , SI F Q , et al . Digital binning method for CCD pixels and its applications [J]. Optics and Precision Engineering , 2017 , 25 ( 8 ): 2204 - 2211 . (in Chinese) . doi: 10.3788/OPE.20172508.2204 http://dx.doi.org/10.3788/OPE.20172508.2204
MA T B , GUO Y F , LI Y F . Precision of row frequency of scientific grade TDICCD camera [J]. Opt. Precision Eng. , 2010 , 18 ( 9 ): 2028 - 2035 . (in Chinese) . doi: 10.3788/OPE.20101809.2028 http://dx.doi.org/10.3788/OPE.20101809.2028
QU H F , WANG X D , XU S Y , et al . Anti-jamming design for multi-velocity imaging mode of multiple TDI CCDs mosaic remote camera [J]. Infrared and Laser Engineering , 2013 , 42 ( 4 ): 1026 - 1032 . (in Chinese) . doi: 10.3969/j.issn.1007-2276.2013.04.035 http://dx.doi.org/10.3969/j.issn.1007-2276.2013.04.035
ZHANG G X , ZHENG L L , HE X J , et al . Imaging crosstalk analyzing and suppressing for multi-TDICCD mosaic remote sensing camera [J]. Acta Optica Sinica , 2014 , 34 ( 7 ): 0711003 . (in Chinese) . doi: 10.3788/aos201434.0711003 http://dx.doi.org/10.3788/aos201434.0711003
XUE X C , LI H F , GUO Y F . Anti-crosstalk techniques for high-speed CCD imaging circuit [J]. Chinese Journal of Optics , 2011 , 4 ( 6 ): 611 - 616 . (in Chinese) . doi: 10.3969/j.issn.2095-1531.2011.06.011 http://dx.doi.org/10.3969/j.issn.2095-1531.2011.06.011
Design of auto-exposure imaging circuit under complex illuminance of Mars in Tianwen-1 high-resolution camera
Speckle filtering method in daytime optical detection of space targets
Physics-guided deep neural network for TDI CCD noise modeling
Design and experiment of micro-arrayed beam blanker
Target operating range of dual band aerial remote camera
Related Author
HUANG Jingtao
WANG Xiaodong
SUN Zhenya
ZHOU Dali
ZHOU Pengji
BI Xun
WANG Weiguo
CHEN Qiang
Related Institution
The 44th Research Institute of China Electronics Technology Group Corporation
Key Laboratory of Optoelectronic Technology and Systems of the Education Ministry of China, Chongqing University
Research Department of Micro-nano Fabrication Technology and Intelligent Electronic Devices, Institute of Electrical Engineering,Chinese Academy of Sciences
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences