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In this work, we address the trajectory optimization of a fixed-wing unmannedaerial vehicle (UAV) using free space optical communication (FSOC). Here, wefocus on maximizing the flight time of the UAV by considering practicalconstraints for wireless UAV communication, including limited propulsion energyand required data rates. We find optimized trajectories in various atmosphericenvironments (e.g., moderate-fog and heavy-fog conditions), while alsoconsidering the channel characteristics of FSOC. In addition to maximizing theflight time, we consider the energy efficiency maximization and operation-timeminimization problem to find the suboptimal solutions required to meet thoseconstraints. Furthermore, we introduce a low-complexity approach to theproposed framework. In order to address the optimization problem, we conduct abisection method and sequential programming and introduce a new feasibilitycheck algorithm. Although our design considers suboptimal solutions owing tothe nonconvexity of the problems, our simulations indicate that the proposedscheme exhibits a gain of approximately 44.12\% in terms of service time whencompared to the conventional scheme.

A UAV-Mounted Free Space Optical Communication: Trajectory Optimization for Flight Time