The Research Of Position And Speed Measurement And Communication Technology Based On The New Loop-cable For Maglev Train

The maglev train makes use of the position and speed measurement system to provide the position and speed signals for the control driving system,realizing to monitor the train for the control center with the train-to-wayside communication system.Therefore,the research of the position and speed measurement system and the train-to-wayside communication system is essential for the development of the maglev train.On the basis of the previous electromagnetic loop-cable theory and other scheme analysis,a new system of the position and speed measurement and the train-to-wayside communication is designed and realized for the medium speed maglev.The paper mainly researches the contents follows:1.On the basis of the electromagnetic induction technology analysis,the principle of three international loop-cable technical solutions is introduced and compared in detail by modeling and simulation,to find the advantages by the comparison between programs.2.On the basis of comparison the various technical solutions,a new type of position and speed measurement system for the medium speed maglev is proposed by introducing the loop-cable structure and the system mechanism,and analyzing the electromagnetic model and signal processing.And the sending circuit and receiving circuit of the system are designed.3.After analyzing the communication system structure based on loop-cable for the medium speed maglev,the antenna structure is analyzed to determine the optimal parameters to improve communication capabilities.Through the transmission line theory,the loop-cable is impedance matched to reduce the power attenuation and control signal reflection.4.The overall design of the communication system is introduced,especially the design of the encoder and decoder and the duplexer,by analyzing the signal processing solution and interference.And the design of the system sending and receiving circuit is introduced.At last,the experiment platform of the position and speed measurement system and the train-to-wayside communication system is introduced,and the experiments of the system are presented on the experiment platform.The experiment result confirms the scheme’s feasibility.