Free space laser communication (FSOC), which features high anti-EM interference capability, good security, is the
important method of the communication between ships. According to the ship motion equations, this paper mainly
discusses the motion law of the ship in the wind waves by using linear system theory. We use a four-degree-of-freedom
platform with a horizontal, a vertical and two rotating motions to simulate the laser movement caused by ship movement
in the wind waves, and give, as an example, a realization of laser movement caused by ship roll movement in the wind
waves. This platform can be used in the lab for the ship-borne free space optical communication (FSOC) system
conveniently and accurately.
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