Research On Air-to-ground Network Coverage And Capacity Analysis Considering Uav Jitter

In recent years,Unmanned Aerial Vehicles(UAVs)have attracted much attention in civil and military scenarios with their unique advantages such as flexibility and easy deployment.At the same time,they have attracted extensive research on UAV technology in the academic community.In the actual communication process of the UAV,it will generate random jitter in three-dimensional space due to the influence of airflow,mechanical vibration of the body and other factors.This will not only affect the stability of the air-to-ground(A2G)communication link,but also affect the performance of UAV A2G communication.Considering the jitter characteristics of UAVs,this thesis focuses on the coverage probability and network capacity of A2G communication in UAV-assisted communication scenarios,which has theoretical guiding significance for the future design of effective A2G communication systems.The main research contents and contributions of this thesis are as follows:1.In view of the jitter model of the UAV elevation angle,the geometric characteristics of the UAV beam coverage area are analyzed using geometry.Then,with the help of Shannon’s theory,the average network capacity of a single UAV assisted ground network user is derived.Through simulation and comparison analysis of the network capacity of different parameters in the jitter scene and the static scene,it is concluded that even if the jittering UAV will reduce the stability of the A2G communication link,jitter can increase the average capacity of the ground network under the appropriate deployment height,path loss and jitter model.2.According to the geometric characteristics of the area covered by the jitter beam,combined with probability theory and calculus theory,the probability of sweeping a typical user on the ground by the jitter beam when the UAV is at any position in the air is derived,which lays a theoretical foundation for the subsequent performance analysis of multi-UAV communication scenarios.3.Aiming at the scenario of UAV network assisting ground network communication,in order to study the impact of jitter characteristics on the coverage probability of typical users,firstly,the Poisson point process is used to model the distribution of UAVs’ position.Then the stochastic geometry theory is used to derive the coverage probability of UAV network users and the coverage probability of ground network users under the condition of spectrum sharing.The correctness of the theoretical derivation is verified by Monte Carlo simulation.At the same time,by comparing and analyzing the simulation curves of the jitter scene and the static scene,it is concluded that under appropriate deployment parameters,jitter can improve the typical user’s coverage probability in the UAV network assisted communication scenarios.