Infrared and Laser Engineering, Volume. 51, Issue 9, 20210997(2022)
Elevation control points extraction of spaceborne lasers with multi-feature parameter constraints
Figures & Tables(16)
Fig. 1. Flowchart of multi-feature parameters constraints algorithm
Fig. 6. Comparison chart of echo characteristic parameters about six ground objects
Fig. 7. Scatter diagram of correlation between echo characteristic parameters
Fig. 8. Comparison between satellite image and original waveform about special points
Table 1. Laser altimeter parameters of GF-7
View tableView in ArticleTable 1. Laser altimeter parameters of GF-7
Parameter Value Laser beam 2 Laser working wavelength/µm 1.064 Laser divergence angle/µrad ≤60 Laser ranging range/km 450-550 Receiving telescope aperture/mm 600 Laser repetition rate 3 Hz （6 Hz at calibration mode） Sampling rate/GSps 2 Spot size/m 15 Ranging accuracy/m ≤0.1 Transmitting pulse energy/mJ ≤180 Transmitting pulse width/ns 4-8 Laser emission efficiency 99.4% Laser receiving efficiency 79.0%
Table 2. Basic information of experimental data
View tableView in ArticleTable 2. Basic information of experimental data
Orbit Beam 1 Beam 2 Total points Valid points Unimodal points Total points Valid points Unimodal points 2085 648 551 179 648 454 271 2086 938 849 424 939 819 503 2088 1125 679 473 1125 649 448 3419 1101 504 219 1101 518 240
Table 3. Basic information of the verified data
View tableView in ArticleTable 3. Basic information of the verified data
Orbit Beam 1 Beam 2 Acquisition time Points Points 672 53 65 2019.12.17 5973 74 96 2020.11.30 11430 65 55 2021.11.19 11583 99 98 2021.11.29
Table 4. The min and max value of each characteristic parameter in typical feature type
View tableView in ArticleTable 4. The min and max value of each characteristic parameter in typical feature type
Feature type SNR min SNR max Kurtosis min Kurtosis max Skewness min Skewness max Grass land 22.75 29.19 2.32 4.87 0.92 1.76 Gobi 19.67 26.11 1.84 3.79 0.66 1.49 Land 20.82 26.33 1.90 5.10 0.69 1.87 Water body 19.61 29.71 1.88 5.89 0.66 2.03 Sand 18.83 25.28 1.89 4.53 0.63 1.72 Arable land 17.19 28.66 1.67 5.24 0.42 1.86 17.19 29.71 1.67 5.89 0.42 2.03
Table 5. Statistical calculation of echo parameters
View tableView in ArticleTable 5. Statistical calculation of echo parameters
Mean value RMSE SNR min 20.34 1.36 Kurtosis min 1.97 0.18 Skewness min 0.71 0.11 Skewness max 1.74 0.14
Table 6. Verification results of elevation accuracy before and after screening
View tableView in ArticleTable 6. Verification results of elevation accuracy before and after screening
Orbit Beam Elevation difference/m Mean value/m RMSE/m Min/m Max/m ① ② ③ ① ② ③ ① ② ③ ① ② ③ 注：①基于有效性筛选后数据；②基于峰值个数筛选后数据；③基于回波特征参数筛选后数据 672 1 −0.47 −0.44 −0.24 2.92 2.71 1.49 0.12 0.12 0.12 5.67 2.59 0.55 2 −0.80 −0.49 −0.38 2.80 0.63 0.44 0.00 0.00 0.00 21.82 3.13 1.14 5973 1 −0.95 −0.90 −0.48 0.84 0.71 0.29 0.01 0.01 0.01 3.41 2.84 1.06 2 −1.98 −1.03 −0.42 2.45 0.58 0.45 0.07 0.07 0.07 8.65 2.29 1.17 11430 1 −0.22 −0.16 −0.09 0.92 0.69 0.42 0.00 0.00 0.00 4.18 1.90 0.83 2 0.28 0.10 0.06 2.81 0.88 0.72 0.00 0.00 0.00 8.32 2.84 0.97 11583 1 0.15 0.08 0.04 0.60 0.61 0.54 0.01 0.01 0.01 2.89 1.95 0.97 2 0.38 0.19 0.15 1.74 0.69 0.46 0.00 0.00 0.00 9.25 3.95 1.40
Table 7. Verification results of laser points before and after screening
View tableView in ArticleTable 7. Verification results of laser points before and after screening
Orbit Laser points Percentage ① ② ③ ④ ⑤ ⑥ ⑦ 注：①筛选前验证区域内总点数；②基于有效性筛选后有效点数；③基于峰值个数筛选后单峰值点数；④基于回波特征参数筛选后阈值范围内点数；⑤符合文中设定精度要求内点数；⑥筛选后点数的保留率；⑦符合精度点数在筛选后中的占比 672 Beam 1 53 50 37 29 25 54.72% 86.21% Beam 2 65 60 50 28 28 43.08% 100.00% 5973 Beam 1 74 73 63 48 40 64.86% 83.33% Beam 2 96 94 83 77 66 80.21% 85.71% 11430 Beam 1 65 64 59 44 42 67.69% 95.45% Beam 2 55 53 45 37 36 67.27% 97.30% 11583 Beam 1 99 86 79 50 46 50.51% 92.00% Beam 2 98 91 72 52 43 53.06% 82.69%
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Yongkang Mei, Junfeng Xie, Wei Chen, Ren Liu. Elevation control points extraction of spaceborne lasers with multi-feature parameter constraints[J]. Infrared and Laser Engineering, 2022, 51(9): 20210997
Paper Information
Category: Lasers & Laser optics
Received: Dec. 21, 2021
Accepted: --
Published Online: Jan. 6, 2023
The Author Email: Xie Junfeng (junfeng_xie@163.com)
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