Research On Radio Wave Propagation Characteristics In High-speed Maglev Millimeter Wave Communication System

The high-speed maglev train has many advantages such as fast running speed,low energy consumption,low pollution,and high safety and reliability.It is a crucial area for research and development in the railroad sector.The wireless communication system in the high-speed maglev system serves as a communication and link between a number of other systems,including the traction system and the operation control system.The research on the radio wave propagation characteristics of the wireless communication system is not only the key to building and optimizing the communication system,but also the key to the normal transmission of maglev train instructions and ensuring the safe operation of the train at high speed.The research object for this thesis is the radio wave propagation characteristics in the high-speed maglev millimeter wave communication system.Using ray tracing technology,extensive research is done on the high-speed maglev train’s channel characteristics in the open,trench,elevated,and pipeline operation scenarios.Analysis of the channel characteristics’ influencing factors is also done,and a test platform is built to confirm the accuracy of the simulation method and re The study’s findings can serve as a guide for creating and perfecting the high-speed maglev millimeter wave communication system.The main research contents of this thesis are as follows:(1)Summarize the radio wave propagation characteristics and channel modeling theory to achieve the application of ray tracing technology in channel modeling.(2)For the open,elevated,trench,and pipeline operation scenarios of the high-speed maglev train,three-dimensional models of the scenarios are respectively built,and ray tracing technology is used to simulate the channels in different scenarios,extract wireless channel characteristic parameters such as path loss,time delay spread,and Doppler frequency shift,and provide base station deployment suggestions.(3)Starting from the demand for millimeter wave communication system field strength measurement,a millimeter wave field strength measurement platform is designed.The measurement platform can achieve a distance trigger spacing of 2mm or more,and the measurement dynamic range can reach 70 d B.The measurement platform can get more specific field strength change characteristics than typical channel measurement platforms and can satisfy the measurement needs of high-speed maglev train situations.(4)Field strength measurement experiments were conducted in both open and corridor scenarios.At the same time,modeling and simulation were conducted for the above scenarios,and the simulation results were consistent with the experimental measurement results.This experiment also verified the accuracy of the simulation method.