Research on the TOF Ranging Based Distance Measurement and Anti-collision Technology for Urban Rail Transit

Abstract

With the increase of the current urban rail transit lines, the pressure on its safety operation increases, and a new method is needed to assist drivers to ensure the safety of vehicle operation. This paper proposes a distance measurement and anti-collision method for urban rail transit based on TOF (time of flight) ranging technology. Firstly, it describes a scenario for long-distance network communication based on the 2.4 GHz open frequency band in urban rail transit. While communicating between two vehicles or between vehicles and trackside equipment, the TOF of the signal to and from the two equipments is used to measure the distance between vehicles. According to the measured distance value, safety warning level is calculated in combination with the operating condition information such as running line of train, up and down information, braking distance, etc., and warning level and operation suggestions are given to driver through display screen, sound and light alarm and other devices to achieve driving assistance and safe operation. The system described in this paper can realize high precision inter-train distance perception within 1 km, and provide driver with real-time driving safety guidance in combination with the communication data content. It provides a solution for improving the safety of urban rail transit operation and realizing the digital construction of train and rail side equipment.

Keywords

• rail transit collision avoidance
• time of flight(tof) ranging
• 2.4 ghz frequency band communication
• rail transit system