Key Technologies Of Wireless Programming In The Ctcs

For the requirements of safe transportation of the train under the condition of high speed and great intensity of traffic, and for improving the auto control ability of the China Train Control System (CTCS), the wireless programmer is studied in the dissertation, with the responder of the CTCS as a background. Three key technologies of the channel in the system are researched.Firstly, a communication protocol of wireless programmer system is designed. Basing on the analysis of communication channel model and the requirement of wireless communication protocol, a wireless protocol that work at 315MHz with ASK modulation is designed. At one time, two difference system work protocols are presented in this thesis.Secondly, a method of S-parameter back-stepping is presented to resolve the issue that can't gain S-parameter at requirement frequency point from the datasheet of device. Basing this method, a high power gain power amplifier is designed in this thesis to match the requirement of wireless programmer system.Thirdly, a digital signal generator and wireless transmitter are designed basing on USB interface technique. The signal generator generate system clock by dividing extra crystal oscillator. And FFFS signal is coded to Manchester code by this module. Finally the signal is modulated and radiated by wireless transmitter.Finally, conclusions for the dissertation, and suggestions for improving the system performance in the future design.