Acta Photonica Sinica, Volume. 49, Issue 4, 0406003(2020)
Alignment Control Algorithm of Underwater LD Communication Based on EKF
Figures & Tables(12)
Fig. 1. The normalized intensity distribution under different transmission distances
Fig. 2. Alignment diagram of receiver and transmitter of UOWC system
Fig. 6. The convergence of the estimate state and the actual state
Table 1. Monte Carlo numerical simulation parameters
View tableView in ArticleTable 1. Monte Carlo numerical simulation parameters
Parameters Value Number of photons 2×106 Wavelength λ /nm520 Beam width/waist radius a t/mm0.789 Divergent half angle θ /mrad1 Receiving surface radius a r/mm1.5 Seawater overall attenuation loss coefficient c /m－10.151
Table 2. Fitting function parameters
View tableView in ArticleTable 2. Fitting function parameters
Transmission distance d /m10 15 20 25 a 0.982 1 1.005 0 0.987 5 0.993 1 b 0.010 5 0.015 1 0.020 8 0.025 3
Table 3. EKF algorithm simulation initialization parameters
View tableView in ArticleTable 3. EKF algorithm simulation initialization parameters
Parameter Description Value \begin{document}${{\overset{\wedge }{\mathop{\boldsymbol{x}}}\, }_{\text{ }0\text{ }|\text{ }0}}$\end{document} Initial time state estimate [2, 0]T P Initial error covariance matrix \begin{document}$\left[\begin{array}{ll} 1 & 0 \\ 0 & 5 \end{array}\right]$\end{document}
Table 4. Relationship between spot radius, alignment error, receiving efficiency and transmission distance
View tableView in ArticleTable 4. Relationship between spot radius, alignment error, receiving efficiency and transmission distance
Transmission distance/m Alignment error/m Receiving efficiency η 15 0.001 3 98.75% 20 0.001 5 98.65% 25 0.001 9 99.01%
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Hao LIU, Yi YANG, Ya-fang YIN, Jian-lei ZHANG, Si-jing LI. Alignment Control Algorithm of Underwater LD Communication Based on EKF[J]. Acta Photonica Sinica, 2020, 49(4): 0406003
Paper Information
Category: Fiber Optics and Optical Communications
Received: Nov. 25, 2019
Accepted: Feb. 22, 2020
Published Online: Apr. 24, 2020
The Author Email: Yi YANG (yangyi@xupt.edu.cn)
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