Opto-Electronic Engineering, Volume. 51, Issue 4, 240002-1(2024)
Design and implement of a space-borne sun glint polarization parameter computing system
Figures & Tables(13)
Fig. 2. The relationship between the degree of polarization and angle of polarization and observed zenith angle at different solar zenith angles
Fig. 3. Comparison of suppression effects between parallel polarizers and specific angle polarizers
Fig. 6. Line biased light source and atmosphere calibration instrument probe
Table 1. Ruler of the lookup table
View tableView in ArticleTable 1. Ruler of the lookup table
Start End Step Average Solar zenith 0° 80° 8° View zenith 0° 80° 5° Differentials azimuth 0° 360° 10° Wind speed 4.1 m/s Wind azimuth 90°
Table 2. Performance comparison of two datatype
View tableView in ArticleTable 2. Performance comparison of two datatype
Latency DSP48E FF LUT FLOAT 6 6 840 1182 AP_FIXED<32,16> 0 3 0 76
Table 3. CORDIC algorithm iteration factor
View tableView in ArticleTable 3. CORDIC algorithm iteration factor
i tanθ θ Iteration factor 0 1 45 0.70711 1 0.5 26.56505 0.63246 2 0.25 14.03624 0.61357 3 0.125 7.12502 0.60883 4 0.0625 3.57633 0.60765 5 0.03125 1.78991 0.607352 6 0.015625 0.89517 0.607278 ··· ··· ··· ···
Table 4. Performance and resource comparison of three algorithms
View tableView in ArticleTable 4. Performance and resource comparison of three algorithms
Latency Interval DSP48E FF LUT CORDIC 4 1 0 442 3640 sin 39 39 3 226 1119 Taylor 36 36 6 2942 4678
Table 5. Performance and resource comparison before and after optimization
View tableView in ArticleTable 5. Performance and resource comparison before and after optimization
Latency FF DSP48E Before After Before After Before After GHT 181 109 3317 4883 12 4 CDOLP 104 69 1852 3430 0 0 MDOLP 1397 368 8191 8729 14 20
Table 6. 0° experiment results
View tableView in ArticleTable 6. 0° experiment results
Parameter Value Mean DN1 3717 Mean DN2 5562 Mean DN3 740 DOLP 0.967 Standard deviation of DOLP 0.023 AOP 4.377° Standard deviation of AOP 0.112
Table 7. Experiment results
View tableView in ArticleTable 7. Experiment results
Angle of light MEAN DN1 MEAN DN2 MEAN DN3 DOLP Standard deviation of DOLP AOP Standard deviation of AOP 30° 1127 5937 3002 0.971 0.003 30.10 0.098 60° 728 3687 5612 0.976 0.002 60.45 0.126 90° 2963 1102 5982 0.974 0.003 90.35 0.100 120° 5569 734 3708 0.970 0.002 119.94 0.120 150° 5972 2971 1104 0.975 0.003 150.20 0.107 180° 3727 5559 735 0.973 0.002 180.30 0.110
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Yuhao Li, Feng Ji, Zhenwei Qiu, Feinan Chen, Zhuoran Li, Gaojun Chi, Jingjing Chen, Yadong Hu, Mengfan Li. Design and implement of a space-borne sun glint polarization parameter computing system[J]. Opto-Electronic Engineering, 2024, 51(4): 240002-1
Paper Information
Category: Article
Received: Jan. 23, 2024
Accepted: Feb. 26, 2024
Published Online: Jul. 8, 2024
The Author Email: Feinan Chen (陈斐楠)
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