Emergency Management of Urban Rail Transportation Using CBTC System

Urban rail transit systems are rapidly developing around the world. Due to a great deal of urban traffic pressure, improving the efficiency and capacity of urban rail transit systems is an increasing demand. Because it is a key subsystem of urban rail transit systems, communication-based train control(CBTC) is an automated train control system that makes use of train–ground wireless communications to ensure the safe operation of rail vehicles .It can enhance the level of safety and service offered to customers and improve the utilization of railway network infrastructure .CBTC is a modern successor to the traditional railway signaling system using inter locking, track circuits, and signals. Building a train–ground wireless communication system for BTC is a challenging task. As urban rail transit systems are mostly deployed in underground tunnels, there are large amounts of reflections, scattering, and barriers that severely affect the propagation performance of wireless communications. However, most of the current WLAN standards were not originally designed for the high-speed environment in tunnels .Furthermore; the fast movement of trains will cause frequent handoffs between WLAN access points (APs), which can severely affect CBTC performance. The sensors such as speed sensor, gas sensor, fire sensor, mems sensor are used to send the speed and fire position direction and location of the train then the Zone controller send the brake curve to the corresponding train. Here we are using the WIFI or Zigbee WPAN (Wireless Personnel Area Network) is operating on the frequency 2.4 GHz. which has more coverage comparing RF Transceiver. The Microcontroller constantly reads the data of sensors and sends the information as serial