Spacecraft Recovery & Remote Sensing, Volume. 46, Issue 1, 60(2025)

End–to-end Anlysis of Image Quality for Satellite-Based Digital TDI Imaging

Xuxia ZHUANG1,2, Jiuzhe WEI1,2, and Jinping HE1,2
Author Affiliations
  • 1Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China
  • 2Beijing Key Laboratory of Advanced Optical Remote Sensing Technology, Beijing 100094, China
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    Figures & Tables(22)
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    • Table 1. Advantages and disadvantages of different methods

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      Table 1. Advantages and disadvantages of different methods

      方法优点缺点
      面阵探测器+像移补偿机构适用于动目标引入额外部组件导致体积和质量增加,对补偿机构可靠性要求高
      面阵探测器+卫星慢扫/凝视适用于动目标对卫星平台要求高
      模拟线阵推扫TDI技术技术成熟器件成本高、复杂、质量功耗大;不适用于动目标
      面阵DTDI技术多模式使用量化噪声、读出噪声等对信噪比的影响比模拟TDI高;需要数据处理
    • Table 2. Parameters of the detector

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      Table 2. Parameters of the detector

      参数名称指标
      读出噪声2e-
      量化噪声0.13e-
      暗电流噪声0.9e-
      信号电子数3×103
      积分级数(叠加帧数)1~10
    • Table 3. Simulation parameters

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      Table 3. Simulation parameters

      项目指标
      太阳高度角/(°)15,30,45
      大气模式中纬度夏季
      气溶胶模型乡村-23 km
      轨道高度/km500
      平台稳定度/((°)/s)0.005,0.01,0.05,0.1
      噪声/e-5,10,20
      像素规模/像素1024×1024
      分辨率/m0.9
      量化位数/bit8,10,12,16
      积分时间/ms0.063,0.126,0.252
      帧频/(帧/秒)90,150,300
    • Table 4. Evaluation results of different exposuring time

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      Table 4. Evaluation results of different exposuring time

      积分时间/ms叠加帧数/帧叠加前SNR叠加后SNR叠加后MTF叠加后MTF×SNR
      0.0631631.5126.10.1215.1
      0.126845.7128.90.0810.3
      0.252465.2130.00.011.3
    • Table 5. Evaluation results of SNR

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      Table 5. Evaluation results of SNR

      量化位数/bit单帧SNR叠加后SNR
      841.3116.7
      1045.3127.9
      1245.7128.9
      1645.8128.9
    • Table 6. Evaluation results of different frames

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      Table 6. Evaluation results of different frames

      叠加帧数/帧单帧SNR单帧MTF叠加后MTF叠加后SNR叠加后MTF×SNR
      845.70.130.08128.910.31
      645.70.130.10111.511.15
      445.70.130.1291.310.96
    • Table 7. Evaluation results of different noise values

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      Table 7. Evaluation results of different noise values

      器件噪声单帧SNR叠加后SNR
      5e-46.6130.9
      10e-45.7128.9
      20e-42.9121.5
    • Table 8. Evaluation results of different sun elevations

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      Table 8. Evaluation results of different sun elevations

      太阳高度角/(°)单帧SNR叠加后SNR叠加后MTF
      1530.1120.3(叠加16帧)0.04
      3045.7128.9(叠加8帧)0.08
      4555.2135.3(叠加6帧)0.11
    • Table 9. Evaluation results of different platform stabilities

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      Table 9. Evaluation results of different platform stabilities

      平台稳定度/((°)/s)单帧SNR叠加后SNRMTF
      0.00545.7128.90.08
      0.0145.5128.50.07
      0.0545.6128.90.07
      0.145.8128.60.07
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    Xuxia ZHUANG, Jiuzhe WEI, Jinping HE. End–to-end Anlysis of Image Quality for Satellite-Based Digital TDI Imaging[J]. Spacecraft Recovery & Remote Sensing, 2025, 46(1): 60

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    Paper Information

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    Received: May. 9, 2024

    Accepted: --

    Published Online: Apr. 7, 2025

    The Author Email:

    DOI:10.3969/j.issn.1009-8518.2025.01.006

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