Author: Fan, Yutong
Title: Cellular-connected UAV trajectory optimization assisted by radio map
Advisors: Zhang, Shuowen (EIE)
Degree: M.Sc.
Year: 2022
Subject: Drone aircraft
Drone aircraft -- Control systems
Hong Kong Polytechnic University -- Dissertations
Department: Department of Electronic and Information Engineering
Pages: color illustrations
Language: English
Abstract: The applications of unmanned aerial vehicles (UAVs) have been constantly growing. To ensure the safety of UAVs, a promising approach is to connect UAVs with the cellular network, which is termed as cellular-enabled UAV communication. This dissertation aims to study various UAV trajectory design problems under connectivity constraints with the cellular network. Specifically, we make use of radio maps which characterize the large-scale channel gains between the UAVs and the ground base stations (GBSs). First, we consider the trajectory design of a single UAV and aim to minimize its flying distance between two points, under a connectivity constraint with the GBSs. The problem is reformulated as a shortest path problem (SPP) and solved via the Dijkstra algorithm. Next, we extend our study to a scenario with multiple UAVs each under connectivity constraints, where we aim to design their trajectories to minimize their mission completion time while avoiding collision. We modified the Dijkstra algorithm for the SPP problem by considering two mechanisms for collision avoidance, based on geometry and time-delay, respectively. Finally, we consider the scenario where the UAV needs to exchange data with the GBSs, where we study the UAV trajectory design to maximize the sum achievable rate during its mission, under connectivity constraints. We reformulate this problem as a longest path problem (LPP), and propose a solution using depth-first search (DFS). Simulation results using MATLAB are provided, which show that the above problems can be effectively solved with the assistance of radio map.
Rights: All rights reserved
Access: restricted access

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