The rapid establishment and stable maintenance of blue-green laser communication links are the conditions for the application of underwater long-distance laser communication. In the case of platform disturbance and random disturbance of seawater channels, the dynamic adaptive Acquisition Pointing and Tracking (APT) system ensures high-precision and fast alignment of laser communication links. Aiming at the problem of communication interruption caused by the interference in underwater laser communication links, combined with the characteristics of an adjustable liquid crystal optical attenuator and photoelectric tracking system, a dynamic adaptive underwater laser communication APT control system is designed and developed in this essay. The experimental results show that the blue-green laser communication system realizes the full-duplex communication function and has engineering significance.
KEYWORDS: Photons, Scattering, Monte Carlo methods, Telecommunications, Signal attenuation, Field programmable gate arrays, Wireless communications, Light sources, Light scattering
With the continuous development of ocean exploration technology, people put forward higher requirements for highspeed and long-distance underwater wireless communication technology. Underwater wireless optical communication (UWOC) has attracted the attention of many scholars because of its high transmission rate, large capacity, low power consumption and small size. In this paper, an underwater communication scheme using blue-green excitation (532nm) as signal source is presented from the point of view of hardware and software design. This paper establishes a model by mathematical method, analyses many factors that affect the state of underwater optical communication link, simulates the real underwater channel environment by Monte Carlo method, establishes end-to-end signal strength model, and finally simulates and verifies the communication system by MATLAB software.
In this paper, we design an adaptive underwater wireless laser communication terminal which contains optical unit, acquisition tracking and pointing (ATP) unit, and communication unit. This kind of architecture could achieve automatics alignment, and solve the contradiction of signal receiving due to the saturation of detector power at close range and insufficient power at long range. Besides, the communication rate in this design could be adjusted according to the channel conditions. The communication rate can support 100Mbps at most, and the distance can reach up to 200 meters based on the design.
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