Key Technologies Of The Ctcs-point Transponder System Information Transmission

For the requirements of the train's safe transportation under the condition of high speed and great intensity of traffic, the standards of China Train Control System (CTCS) are instituted by the Natural Ministry of Railroad. The technologies of CTCS are researched and developed according to the standards of Europe Train Control System (ETCS). The spot responder system which is the necessary part of CTCS is analyzed in the dissertation and three key technologies of the channel in the responder system are researched.Firstly, a new kind of rectangular plate magnetic inductive loop antenna is designed to transmit the power frequency. Researching the near field inter-inductive characters, the relationship among the inductive efficiency, the perimeter and the conductor width of the antenna is found out. And the near field lobe of the antenna is verified by emulation and experiment. A broadband matching network is designed for the broadband signal antenna, using one of the broadband matching technologies- Real Frequency Theory.Secondly, the relative theory, design and emulate of the power amplifier are presented, and a power amplifier of high output power and high efficiency is designed, according to the standards of the responder system.Thirdly, the relative theories of the limiter and rectifier are studied. In order to make the passive responder work stably under the conditions of large dynamic range of the receiving power and the high efficiency requirement, a two-stage limiter circuit and a voltage-doubler rectifier circuit with several diodes parallel are developed.