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Monocular vision aided optical tracking for underwater optical wireless communications.

Jingyi Tang, Rui Jiang, Zhen Chen

    Optics Express
    |April 27, 2022
    PubMed
    Summary

    This study introduces a novel tracking method for underwater optical wireless communication (UOWC) systems. The proposed technique ensures stable data transmission by maintaining accurate alignment, even amidst significant underwater disturbances.

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    Area of Science:

    • Optical Engineering
    • Underwater Communications
    • Robotics and Control Systems

    Background:

    • Underwater optical wireless communication (UOWC) offers high bandwidth and low latency but suffers from link instability due to environmental factors like water flow, turbulence, and terminal vibrations.
    • Maintaining a stable transmission link is critical for reliable UOWC system performance.

    Purpose of the Study:

    • To propose and validate a novel monocular vision-aided optical tracking method for autonomous real-time alignment in UOWC systems.
    • To enhance the robustness and reliability of UOWC links under challenging underwater conditions.

    Main Methods:

    • A monocular vision system is employed to monitor the laser spot's deviation.
    • The deviation degree of the laser spot is utilized for autonomous real-time alignment between the UOWC transmitter and receiver.
    • Experimental validation under strong disturbance conditions.

    Main Results:

    • The proposed tracking method effectively maintains autonomous real-time alignment of the receiver with the transmitter.
    • The bit error ratio (BER) was consistently kept below the forward error correction (FEC) limit of 3.8×10-3.
    • The system demonstrated robust performance even under significant environmental disturbances.

    Conclusions:

    • The developed monocular vision-aided optical tracking method is essential for ensuring stable and reliable UOWC links.
    • This approach significantly improves the practical applicability of UOWC systems in dynamic underwater environments.
    • The method provides a robust solution for maintaining communication integrity despite external interference.