Study On Embedded Based On-Board Host Computer Of Radio Based Cab Signal System

ABSTRACT: Along with the network-based development of railway transport towards high-speed and informationization, Communication based Train Control System (CBTC) has become the main trend in the development of train control system. Radio Based Cab Signal System is a kind of device that transmits the train traffic signal and train control information through the wireless channel, which belongs to the above trend. Based on the studies on the on-board host computer with MCU as its core, this paper proposes a program which uses the embedded technology to design the on-board host computer. The design conforms to the principles of COTS, further improving the performance, reliability and functions of the system.The paper elaborates the basic principle of the design, proposes a comprehensive program that designs the on-board host computer of Radio Based Cab Signal System with embedded technology with PC/104 as its Control-Core. It also successfully designs the hardware of embedded on-board motherboard, integrating extended circuit serial, I/O input and output circuits, data storage circuit and PC/104 circuit, and compiles the related application program. To improve the reliability and safety of the on-board equipment, the paper also designs output circuit of train signal, dynamic scanning circuit, GPS circuit. It focuses on the design of Hot Stand-by redundant structure, conducting researches on the key technologies such as a double-switch controller, dual power-struggle, redundant communications heartbeat, heart Fault detection, double synchronous information, etc.The paper conducts a test on the on-board equipment and ground equipment on the test platform, verifying the function of the on-board equipment and achieving the predefined goal. It also assesses the reliability and security of the redundant equipment of Radio Based Cab Signal System, and emulates the key parameters that affect the on-board redundant equipment through the emulation software-MATLAB. Theoretical analysis shows that the on-board redundant equipment based on embedded technology designed in the paper can improve the reliability and security of the system...