Acta Photonica Sinica, Volume. 49, Issue 10, 1001002(2020)
Receiver Alignment System Based on Underwater Spot Tracking
Figures & Tables(15)
Fig. 3. Mean Shift iterative flow chart combining UKF and linear fitting
Fig. 11. Relationship between coordinate deviation and angular velocity
Table 1. Experimental parameters
View tableView in ArticleTable 1. Experimental parameters
Transmitter parameters Value Channel parameters Value Operating voltage/V 5 Distance/m 3.15 Wavelength/nm 520 Attenuation coefficient/(dB·m-1) 1.1 Transmit power/mW 30 Temperature/℃ 26 Divergent half angle/(°) 0.03
Table 2. Tracking error when the light spot is blocked
View tableView in ArticleTable 2. Tracking error when the light spot is blocked
Serial number Spot actual center
coordinates
Spot tracking center
coordinates
Pixel coordinate error Root mean square error a (82,132) (85,135) 4.24 1% b (158.5,134) (149.5,131) 9.02 2.1% c (180,131) (172,127.5) 8.73 2% d (210,125) e (276.5,126) (270,123.5) 8.13 1.5% f (359,128) (352.5,130.5) 6.96 1.4%
Table 3. Tracking error when the light spot is blocked
View tableView in ArticleTable 3. Tracking error when the light spot is blocked
Serial number Spot roundness Spot actual center
coordinates
Spot tracking center
coordinates
Pixel coordinate error Root mean square error a 0.81 (159,164) (162.5,163.5) 3.57 1% b 0.94 (187.5,166) (188.5,166.5) 1.58 0.5% c 0.63 (218,171) (204.5,170.5) 13.5 4.1% d 0.69 (284,169.5) (270.5,167.5) 13.9 4%
Table 4. Tracking error under turbulence
View tableView in ArticleTable 4. Tracking error under turbulence
Serial number Spot actual center
coordinates
Spot tracking center
coordinates
Pixel coordinate error Root mean square error a (112,134) (114,135) 2.23 0.7% b (167,125) (164,126.5) 3.16 1% c (218,127.5) (221.5,129) 3.80 1.2% d (256,139) (258,140.5) 2.5 0.78%
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Feng-tao HE, Si-jing LI, Yi YANG, Jian-lei ZHANG. Receiver Alignment System Based on Underwater Spot Tracking[J]. Acta Photonica Sinica, 2020, 49(10): 1001002
Paper Information
Category: Atmospheric and Oceanic Optics
Received: Jun. 30, 2020
Accepted: Aug. 25, 2020
Published Online: Mar. 10, 2021
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