Research On Wireless Induction Communication System For Maglev Train

The train-ground Communication system plays a very important role in the maglev train. An efficient and reliable train-ground communication system is the key to insure the safty of the train and the smooth transimision of commands and attempts. The principle of the maglev train is quite different from the tranditinal train. Because there is no michanical friction between the train and the rail, the communication via the loop of rail and wheels is unable to use. In addition, the communication system of maglev train works at high speed and in bad elctormagnetic condition; The equipments in the system is in a large quantity and a far-ranging distribution; The data throughput of the communication system is great and the time requirements is critical. So a new communication method is needed to reach the above requirements. In this thesis, a new communication method-wireless induction communication method is studied.Wireless induction communication method is based on electromagnetic induction principle, using the electromagnetic coupling to transmit data between the train and ground. This communication system can cover a long rail and it is easy to maintain and fix. The signal wastage via this communication system is little.In this thesis, founding on the study of the feature of the communication system in maglev train, the design principia of the communication system in maglev train is brought forward. After understanding the feature of the communication system and the induction signal in maglev train, the advantage and disadvantage of several binary modulating and demodulating methods is studied. Then, two communication system based on parallel cable and crossed induction coils is put forward.According to the electromagnetic induction principle, the magnetic field of induction cable of the two communication systems is analyzed, the system parameters is caculated and the system feasibility is being demonstrated. Based on above analysis, refering to the maglev train development status of our nation, the design scheme of Wireless induction communication system is confirmed. And the circuit of signal generating, modulating, magnifying, transmiting, receiving, demodulating, handling and protecting is also designed. Then, the experiment of the two system is accomplished, and the result is analyzed.finally, the anti-jamming method of the Wireless induction communication system is researched and studied. And the ideas to improv the performance is brought forword.