Infrared and Laser Engineering, Volume. 50, Issue 8, 20200396(2021)
In-orbit geometric calibration and accuracy evaluation of GaoFen-7 spaceborne laser altimeter
Figures & Tables(15)
Fig. 1. Earth observation diagram of GF-7 spaceborne laser altimetry system
Fig. 2. Geometric calibration diagram of spaceborne laser based on terrain matching
Fig. 3. Geometric calibration diagram of spaceborne laser based on single footprint image
Fig. 4. Geometric calibration diagram of spaceborne laser based on triggered ground detector. (a) Physical drawing of detectors triggered by GF-7; (b) Spot of GF-7 beam 1 after fitting; (c) Spot of GF-7 beam 2 after fitting
Fig. 10. The 672th track beam 1 laser elevation precision under three kinds of calibration method
Fig. 11. The 672th track beam 2 laser elevation precision under three kinds of calibration method
Table 1. Atmospheric correction of GF-7 calibration laser point
View tableView in ArticleTable 1. Atmospheric correction of GF-7 calibration laser point
Laser point 203600254.00 204032175.67 Pressure/Pa 90082.33 89454.00 Precipitable water/mm 7.4300 15.1200 Dry delay/m 2.034 2.0200 Wet delay/m 0.0006 0.0012 Total delay/m 2.0340 2.0210
Table 2. Tidal correction of GF-7 calibration laser point
View tableView in ArticleTable 2. Tidal correction of GF-7 calibration laser point
Laser point 203600254.00 204032175.67 Solid tide/m 0.0133 0.2257 Pole tide/m −0.0057 −0.0058 Sea tide/m 0.0000 0.0000 Wet delay/m 0.0010 0.0018 Total delay/m 0.0086 0.2217
Table 3. Three kinds of calibration methods to calibrate GF-7 laser pointing deviation
View tableView in ArticleTable 3. Three kinds of calibration methods to calibrate GF-7 laser pointing deviation
Calibration method Beam 1 Beam 2 ${\rm d}\alpha$ ${\rm d}\beta$ ${\rm d}\alpha$ ${\rm d}\beta$ TMC 0.0300 −0.0400 0.1080 −0.0460 SLFIC 0.0310 −0.0368 0.1081 −0.0441 GDC 0.0304 −0.0378 0.1073 −0.0445
Table 4. Accuracy of three calibration methods
View tableView in ArticleTable 4. Accuracy of three calibration methods
Calibration method Beam 1 Beam 2 Mean value/m RMSE/m Mean value/m RMSE/m TMC −0.764 0.363 −0.866 0.722 SLFIC −0.673 0.196 −0.702 0.605 GDC 0.034 0.177 −0.022 0.157
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Junfeng Xie, Ren Liu, Zongwei Wang, fan Mo, Xianhui Dou. In-orbit geometric calibration and accuracy evaluation of GaoFen-7 spaceborne laser altimeter[J]. Infrared and Laser Engineering, 2021, 50(8): 20200396
Paper Information
Category: Lasers & Laser optics
Received: Dec. 12, 2020
Accepted: --
Published Online: Nov. 2, 2021
The Author Email: Liu Ren (rs_liur@163.com)
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