A High-Precision Extraction Algorithm for Centroid of Laser Footprint Spot of GF-7 Satellite

Shoufeng Ren; Xinming Tang; Xiaoyong Zhu; Ao Li; Dian Qu

doi:10.3788/AOS202141.1012001

Acta Optica Sinica, Volume. 41, Issue 10, 1012001(2021)

A High-Precision Extraction Algorithm for Centroid of Laser Footprint Spot of GF-7 Satellite

Shoufeng Ren^1,2,3,4, Xinming Tang^1,2、*, Xiaoyong Zhu^2、**, Ao Li², and Dian Qu²

Author Affiliations

¹Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China

²Land Satellites Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China

³National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring, Lanzhou, Gansu 730070, China

⁴Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou, Gansu 730070, China

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Figures & Tables(9)

Fig. 1. Flow chart of our algorithm

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Fig. 2. Simulated spot images. (a) Ideal simulated spot; (b) simulated spot with 15% random noise

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Fig. 3. Relationship between LOASI and ground optical projection

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Fig. 4. Laser optical axis surveillance image

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Fig. 5. Centroid of LOASI spot extracted by different algorithms

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Fig. 6. GF-7 LOASI-1, LOASI-2 centroid coordinate statistics in August 19, 2020. (a) LOASI-1, in x direction; (b) LOASI-1, in y direction; (c) LOASI-2, in x direction; (d) LOASI-2, in y direction

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Table 1. Centroid statistics of simulated spots extracted by different algorithmsunit:pixel

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Table 1. Centroid statistics of simulated spots extracted by different algorithmsunit:pixel

Method	Mean		Range		RMSE
Method	x	y	x	y	x	y	xy
GCM	12.1480	12.1279	0.1963	0.1895	0.1061	0.1015	0.1468
GFM	12.2450	12.1889	0.3913	0.5320	0.1375	0.1867	0.2319
EFM	12.6884	12.7949	0.6884	0.7949	0.3234	0.4133	0.5248
GGM	12.0704	12.0617	0.1270	0.1094	0.0360	0.0300	0.0469

Table 2. Centroid statistics of GF-7 laser spots extracted by different algorithmsunit:pixel
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Table 2. Centroid statistics of GF-7 laser spots extracted by different algorithmsunit:pixel
Method x y Display
GCM 13.693 13.552 Triangle
GFM 14.074 13.482 Circle
EFM 14.340 14.878 Square
GGM 13.989 12.929 Cross

Table 3. Statistical results of LOASI-1, LOASI-2 centroid extraction experiment of GF-7 in August 19, 2020unit:pixel
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Table 3. Statistical results of LOASI-1, LOASI-2 centroid extraction experiment of GF-7 in August 19, 2020unit:pixel
Item Mean Range RMSE
x y x y x y xy
LOASI-1 13.1709 13.0668 0.0115 0.0271 0.0026 0.0062 0.0067
LOASI-2 13.0268 13.0734 0.0093 0.0233 0.0019 0.0052 0.0055

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Shoufeng Ren, Xinming Tang, Xiaoyong Zhu, Ao Li, Dian Qu. A High-Precision Extraction Algorithm for Centroid of Laser Footprint Spot of GF-7 Satellite[J]. Acta Optica Sinica, 2021, 41(10): 1012001

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Paper Information

Category: Instrumentation, Measurement and Metrology

Received: Oct. 19, 2020

Accepted: Dec. 8, 2020

Published Online: May. 8, 2021

The Author Email: Tang Xinming (tangxinming99@qq.com), Zhu Xiaoyong (176051619@qq.com)

DOI:10.3788/AOS202141.1012001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Centroid statistics of simulated spots extracted by different algorithmsunit:pixel

Table 1. Centroid statistics of simulated spots extracted by different algorithmsunit:pixel

Table 2. Centroid statistics of GF-7 laser spots extracted by different algorithmsunit:pixel

Table 2. Centroid statistics of GF-7 laser spots extracted by different algorithmsunit:pixel

Table 3. Statistical results of LOASI-1, LOASI-2 centroid extraction experiment of GF-7 in August 19, 2020unit:pixel

Table 3. Statistical results of LOASI-1, LOASI-2 centroid extraction experiment of GF-7 in August 19, 2020unit:pixel