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Infrared and Laser Engineering, Volume. 50, Issue S2, 20210539(2021)

Analysis on the change of GF-7 satellite laser altimeter spot centroid position

Jiaqi Yao1...2, Guoyuan Li1,2,*, Jiyi Chen2, Xiaoqing Zhou2, Aiyan Guo3, Genghua Huang4, Xinming Tang1,2 and Bo Ai1 |Show fewer author(s)
Author Affiliations
  • 1College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China
  • 2Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China
  • 3Beijing Institute of Spacecraft System Engineering, Beijing 100094, China
  • 4Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (12)
    Equations (5)
    References (19)
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    Figures & Tables(12)
    Imaging mechanism of LFC and LOASC

    Fig. 1. Imaging mechanism of LFC and LOASC

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    Distribution of laser spot on LFI and LSI

    Fig. 2. Distribution of laser spot on LFI and LSI

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    Flowchart of the algorithm

    Fig. 3. Flowchart of the algorithm

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    Threshold constraint algorithm for extracting centroid of ellipse fitting

    Fig. 4. Threshold constraint algorithm for extracting centroid of ellipse fitting

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    Accuracy analysis of proposed algorithm

    Fig. 5. Accuracy analysis of proposed algorithm

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    Spot centroid coordinate statistics of LFI of laser 1 (a) and laser 2 (b)

    Fig. 6. Spot centroid coordinate statistics of LFI of laser 1 (a) and laser 2 (b)

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    Changes of centroid of two beams in X and Y directions on LFI

    Fig. 7. Changes of centroid of two beams in X and Y directions on LFI

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    Centroid coordinate statistics of LSI of laser 1 (a) and laser 2 (b)

    Fig. 8. Centroid coordinate statistics of LSI of laser 1 (a) and laser 2 (b)

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    Change of distance between spots in the LSI

    Fig. 9. Change of distance between spots in the LSI

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    • Table 1. Accuracy evaluation of centroid extraction algorithm for footprint image（Unit: pixel）

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      Table 1. Accuracy evaluation of centroid extraction algorithm for footprint image（Unit: pixel）

      MethodMeanRangeRMSE
      XYXYXY
      GCM2.5652.5224.9415.1852.5122.218
      TEFM0.0620.0710.0920.0880.0520.081

    • Table 2. Statistical results of monthly mean of spot centroid coordinates of LFI (Unit: pixel)

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      Table 2. Statistical results of monthly mean of spot centroid coordinates of LFI (Unit: pixel)

      TimeLFI
      Laser 1Laser 2
      XYXY
      2020Mar.120.83263.71216.32162.51
      Apr.120.50264.51216.88162.63
      May120.35263.88216.85162.56
      Jun.120.37263.79216.87162.36
      Jul.120.52263.90216.93162.10
      Aug.120.63263.28216.81161.65
      Sep.120.51262.26216.72161.53
      Oct.120.11261.85216.35161.60
      Nov.120.33262.02216.42161.64
      Dec.120.37262.30216.31161.82
      2021Jan.120.49262.55216.00161.65
      Feb.120.36262.55216.81161.17
      Mar.120.45262.67216.62161.68
      Apr.120.43262.63216.63161.07

    • Table 3. Statistical results of monthly mean of spot centroid coordinates of LSI (Unit: pixel)

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      Table 3. Statistical results of monthly mean of spot centroid coordinates of LSI (Unit: pixel)

      TimeLSIDistance between two spots in the LSI
      Laser 1Laser 2
      XYXY
      2020Mar.57.18313.10228.01156.670
      Apr.56.93313.35228.63156.311.05
      May56.51313.39228.84156.141.66
      Jun.56.41313.35228.79156.091.71
      Jul.56.52313.32228.81156.291.48
      Aug.56.08313.68228.77156.182.09
      Sep.55.99313.75228.68156.222.11
      Oct.55.77313.63228.82156.622.03
      Nov.56.08314.031228.71156.222.26
      Dec.55.93313.74228.67156.501.95
      2021Jan.56.22313.62228.56156.621.49
      Feb.56.50313.51228.79156.491.47
      Mar.56.47313.62228.59156.561.38
      Apr.56.48312.99228.82156.251.33
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    Jiaqi Yao, Guoyuan Li, Jiyi Chen, Xiaoqing Zhou, Aiyan Guo, Genghua Huang, Xinming Tang, Bo Ai. Analysis on the change of GF-7 satellite laser altimeter spot centroid position[J]. Infrared and Laser Engineering, 2021, 50(S2): 20210539

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    Paper Information

    Category: Lasers and laser optics

    Received: Aug. 5, 2021

    Accepted: --

    Published Online: Dec. 3, 2021

    The Author Email: Li Guoyuan (ligy_lasac@foxmail.com)

    DOI:10.3788/IRLA20210539

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology