Research On Transmission Optimization Technology Of UAV Relay Communication Network

In recent years,with the rapid development of electronic information technology,the communication equipment of UAVs has become more and more intelligent and integrated,and the performance of UAVs is steadily improving.When UAV is used as a relay platform in the communication network,it has incomparable advantages compared with other relay platforms.Therefore,UAV relay has a very positive application and development prospect in many fields.However,UAV itself is also very vulnerable to interference,so this paper firstly studies and analyzes the spectrum sensing technology,and builds a spectrum map;Then the location and number of jammer and UAV nodes are integrated to establish a UAV relay communication network model,and the mobility of UAV relay nodes is modeled and analyzed,and a decision model and a mobility model are established respectively;Finally,a evaluation model of UAV relay communication network is established,and the evaluation model is simulated and analyzed with the help of network simulation platform.The main work is as follows:(1)This paper summarizes the existing UAV Communication Technology and relay communication technology,understands the relevant basic concepts in the relay communication network,and understands the duplex mode and forwarding protocol of UAV relay,which lays a foundation for subsequent model establishment and network simulation;The classical mobile models are classified and analyzed,which provides a prerequisite for the establishment and Simulation of mobile models;Understands the basic knowledge of game theory,which lays the foundation for the decision-making model when nodes move;Understands the basic knowledge of OPNET Network simulation tool.(2)The spectrum sensing technology is studied and analyzed,and a spectrum map of a specific scene is drawn through the research on the construction method of spectrum map,which lays a foundation for the subsequent research on the mobile model of UAV relay nodes;A UAV relay communication network model is established,considering the real application scenarios in the UAV relay communication network,a UAV relay communication network model considering the interference environment is established in combination with the UAV relay and the number,location and movement model of interference nodes;A mobile model of UAV relay node is established.On the basis of analyzing the existing mobile model and considering the interference environment,a mobile model of UAV relay node is established.The game theory knowledge is applied to the decision-making of UAV mobile,and a decision-making model is established,so that the UAV can save energy and obtain strong anti-interference ability,The updating equations of velocity and direction in Gaussian smooth moving model are simplified,and an autonomous game moving model is proposed;A evaluation model of UAV relay communication network is constructed,and the relay communication network is evaluated and analyzed through the two dimensions of network anti-interference ability and network data transmission ability.(3)A UAV relay communication network simulation platform is built,and six simulation scenarios are set up.The network anti-jamming ability is simulated and analyzed by comparing the number of jammer nodes and the different UAV mobile models;Based on OPNET Network simulation tool,the UAV relay communication network model is built,and three simulation schemes and 12 scenarios are set to simulate and analyze the network data transmission capability.The simulation results are basically consistent with the expectation,that is,the mobile model with random direction selection is more vulnerable to interference,while the mobile model that can independently select the direction according to the jammer information has significantly less interference intensity,and its performance index is better than other models.