New radar system for train tracking and control

This paper presents a design for a new train control system, which we call the radar system for train tracking and control (RSTTC). The RSTTC is based on the communication-based train control (CBTC) system, and uses radar technology with a spread-spectrum scheme. The main advantage to using the CBTC system is that it allows (1) the headway between trains to be adjustable and (2) the train traffic to be flexible. Radar is employed to identify both train position and the speed necessary for train control. The spread-spectrum technique helps prevent the system from being disturbed by noise and interference on the communication channel. A combination of code-division multiple access (CDMA) and time-division multiple access (TDMA) is used for tracking and controlling multiple trains on a single communication channel.