• Acta Optica Sinica
  • Vol. 41, Issue 23, 2328003 (2021)
Yu Wu1, Xiaoxiang Long2, Jian Yang1, Qijin Han2, Qingpeng Li2, and Song Li1、*
Author Affiliations
  • 1Electronic Information School, Wuhan University, Wuhan, Hubei 430072, China
  • 2China Center for Resources Satellite Data and Application, Beijing 100094, China
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    DOI: 10.3788/AOS202141.2328003 Cite this Article Set citation alerts
    Yu Wu, Xiaoxiang Long, Jian Yang, Qijin Han, Qingpeng Li, Song Li. Variation Law Analysis and Application of GaoFen-7 Laser Pointing[J]. Acta Optica Sinica, 2021, 41(23): 2328003 Copy Citation Text show less
    LFC synchronous mode image. (a) Light spot image in bare mountain area; (b) light spot image in forest area
    Fig. 1. LFC synchronous mode image. (a) Light spot image in bare mountain area; (b) light spot image in forest area
    Grayscale histogram of spot ROI region under different noise conditions. (a) Low noise; (b) medium noise; (c) high noise
    Fig. 2. Grayscale histogram of spot ROI region under different noise conditions. (a) Low noise; (b) medium noise; (c) high noise
    X-direction and Y-direction statistical image of the six-track quality spot center
    Fig. 3. X-direction and Y-direction statistical image of the six-track quality spot center
    X-direction contrast of orbit 2107 spot center. (a) All spot X position on orbit 2107; (b) all quality spot X position on orbit 2107
    Fig. 4. X-direction contrast of orbit 2107 spot center. (a) All spot X position on orbit 2107; (b) all quality spot X position on orbit 2107
    Typical LFC image. (a) Image 339; (b) image 610; (c) image 621
    Fig. 5. Typical LFC image. (a) Image 339; (b) image 610; (c) image 621
    Fitting line in the X direction of orbit 2107 spot center
    Fig. 6. Fitting line in the X direction of orbit 2107 spot center
    X-direction contrast of orbit 2107 in optical axis surveillance camera
    Fig. 7. X-direction contrast of orbit 2107 in optical axis surveillance camera
    X-direction spot center of orbit 4871 and 4947
    Fig. 8. X-direction spot center of orbit 4871 and 4947
    Transit areas of orbit 4871 and orbit 4947
    Fig. 9. Transit areas of orbit 4871 and orbit 4947
    All spot centers on orbit 4871 in X direction
    Fig. 10. All spot centers on orbit 4871 in X direction
    Emits laser energy changes of orbit 4871
    Fig. 11. Emits laser energy changes of orbit 4871
    FeatureReflectivityGrayscale /pixelDefinitionConfidence
    ForestLow<3500ClearHigh
    Farm/urbanMedium3500--4500Relatively ClearMedium
    Bare mountainHigh4500--7000VagueLow
    CloudExtremely high>7000IndistinguishableNone
    Table 1. Features of four typical area LFC images
    SequenceBeforecorrection /pixelAftercorrection /pixelDeviation /pixel
    33913.350112.9702-0.3799
    61011.925013.19661.2716
    62113.225213.2058-0.0194
    Table 2. Comparison table of typical spot X direction position correction
    OrbitFittedslope /10-4Duty /sRange /pixelXTime
    21078.353100.53712.6Daytime
    48715.353600.32813.3Night
    48845.452340.42913.5Night
    49001.972210.15214.0Daytime
    49475.253600.52813.5Night
    49787.652590.33813.5Daytime
    Table 3. X-direction change rule of the spot center in the six-track
    Yu Wu, Xiaoxiang Long, Jian Yang, Qijin Han, Qingpeng Li, Song Li. Variation Law Analysis and Application of GaoFen-7 Laser Pointing[J]. Acta Optica Sinica, 2021, 41(23): 2328003
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