Optics and Precision Engineering, Volume. 30, Issue 2, 217(2022)

Imaging noise analyzing and suppressing for Tianwen-1 high-resolution camera

Pengji ZHOU1...2, Xiaodong WANG1,*, Jihong DONG1, Xianpeng HAO1 and Jingtao HUANG1 |Show fewer author(s)
Author Affiliations
  • 1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun30033, China
  • 2University of Chinese Academy of Sciences, Beijing100049, China
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    Figures & Tables(16)
    Principle block diagram of driving circuit of the CCD
    Schematic diagram of crosstalk in imaging system
    Model of crosstalk in circuit
    Timing of drive signal in abrupt transfer
    Timing of drive signal in sequential transfer
    Oscillogram of vertical transfer
    Regulator circuit of time-constant of driver signal
    Panchromatic images in the same and different speeds condition
    Installation diagram of isolating copper
    Allometric image before and after shielding
    Test image of TDI CCD in outdoor scene
    Image of RGB fusion
    • Table 1. Main technical indicators of a TDI CCD

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      Table 1. Main technical indicators of a TDI CCD

      Working specturmPixel size/μmNumber of pixelsMaximum number of output channelsMaximum pixel readout rate/MHzMaximum row transfer rate/kHzSpectral band/nmMaximum integral stage
      PAN8.756 1448≥25≥26450~90096
      B117.53 0722≥25≥14450~52064
      B217.53 0722≥25≥14520~60048
      B317.53 0722≥25≥14630~69032
      B417.53 0722≥25≥14760~90032
    • Table 2. RMS results of the image in half-saturation before and after noise restraining

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      Table 2. RMS results of the image in half-saturation before and after noise restraining

      ItemRMS/DN
      Before noise restraining13.591
      After noise restraining9.758
    • Table 3. Radiance estimation of camera entrance pupil for each spectral channel

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      Table 3. Radiance estimation of camera entrance pupil for each spectral channel

      Working spectrum

      SNR test input radiance/

      (W·m-2∙sr-1

      30°,0.210°, 0.25°, 0.2
      PAN(450~900 nm)9.013.131.57
      B1(450~520 nm)1.860.650.32
      B2(520~600 nm)1.990.690.35
      B3(630~690 nm)1.250.430.22
      B4(760~900 nm)1.980.690.35
    • Table 4. Test result of SNR of TDI CCD

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      Table 4. Test result of SNR of TDI CCD

      Environment condition

      (altitude angle, ground albedo)

      Spectrum segmentIntegral stageSNR
      CCD1(times)CCD2(times)CCD3(times)
      30°,0.2PAN32109115.1105.8
      B116109.2117.9146.4
      B212138118.1134.6
      B316149.8142.1161
      B416106.5122.9118.7
      10°, 0.2PAN96114120.2111.8
      B148124.3129.6154.5
      B232138.1116.1135
      B332116.4110.8127.8
      B43274.98485.2
      5°, 0.2PAN9668.575.965.5
      B16490.4102.9121.3
      B248119.9102.6116
      B33272.464.482.7
      B4324653.154
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    Pengji ZHOU, Xiaodong WANG, Jihong DONG, Xianpeng HAO, Jingtao HUANG. Imaging noise analyzing and suppressing for Tianwen-1 high-resolution camera[J]. Optics and Precision Engineering, 2022, 30(2): 217

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    Paper Information

    Received: Aug. 18, 2021

    Accepted: --

    Published Online: Mar. 4, 2022

    The Author Email: Xiaodong WANG (wangxd@ciomp.ac.cn)

    DOI:10.37188/OPE.20223002.0217

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