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
- Infrared and Laser Engineering
- Vol. 50, Issue S2, 20210539 (2021)
Fig. 1. Imaging mechanism of LFC and LOASC
Fig. 2. Distribution of laser spot on LFI and LSI
Fig. 3. Flowchart of the algorithm
Fig. 4. Threshold constraint algorithm for extracting centroid of ellipse fitting
Fig. 5. Accuracy analysis of proposed algorithm
Fig. 6. Spot centroid coordinate statistics of LFI of laser 1 (a) and laser 2 (b)
Fig. 7. Changes of centroid of two beams in X and Y directions on LFI
Fig. 8. Centroid coordinate statistics of LSI of laser 1 (a) and laser 2 (b)
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 2. Statistical results of monthly mean of spot centroid coordinates of LFI (Unit: pixel)
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Table 3. Statistical results of monthly mean of spot centroid coordinates of LSI (Unit: pixel)
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