The Ctcs-point Transponder System-leu, Transponder, And Variable Information

China Train Control System (CTCS) is a spot responder system developed by China. The task of the paper is about the Lineside Electronic Unit(LEU) and Transparent Data Balise. LEU processes the instruction from the control center and transmits it to the Interrogator by the Transparent Data Balise to realize automation to bullet train.With the understanding to the CTCS,a new stytle and accord with the station of our country LEU and a Transparent Data Balise are designed. The follow key problems are desolved:1. A independent receiver-module is applied to achieve the compatibility of spot light and RS-485.2. CPLD is used to develop a coder-module,with which message is picked up and coded to Manchester.3. A recorder-module is designed to complete the action of recorder.4. The interface of the Transparent Data Balise is designed to desolve the transition from signal to FSK module.5. Correlative softwares are desiged.In the paper the LEU is combined by the receiver-module,coder-module and recorder-module. Be able to transmit message at the speed of 564.48kbps and 3km remote,accompany controlling four Transparent Data Balises.