Rail transit train rear-end prevention device based on pseudo-random code radio frequency distance measurement

Abstract

The invention provides a rail transit train rear-end prevention device based on pseudo-random code radio frequency distance measurement and belongs to the technical field of rail transit. The device comprises an antenna, a distance measurement unit, a control unit, a warning unit and a parameter input unit. The distance measurement unit is connected with the antenna, the control unit is connected with the distance measurement unit, and the warning unit and the parameter input unit are respectively connected with the control unit. The distance measurement unit is used for measuring the distance between a front train and a back train in the same traveling direction with the method of pseudo-random code radio frequency distance measurement. The parameter input unit acquires information of traveling direction where the train is located and transmits the information to the control unit. The control unit sets a working mode and radio frequency points of the distance measurement unit, compares the distance between the front train and the back train to judge whether the trains are safe and sends an action command to the warning unit. The warning unit displays the distance or gives out warning. The rail transit train rear-end prevention device based on the pseudo-random code radio frequency distance measurement can acquire accurate and real-time distance data of the front train and the back train without support of other devices, output warning information or braking commands, monitor the distance between the front train and the back train effectively, prevent rear-end accidents and improve traffic safety.

Description

technical field [0001] The invention belongs to the technical field of rail transit, and relates to a rear-end collision prevention device for rail transit trains. Background technique [0002] During the operation of the rail transit train, the front and rear trains must maintain a sufficient distance, which is usually required to be greater than the braking distance of the train, so as to ensure the safety of the train. The rail transit operation control system is the technical guarantee for train operation safety. It is used to ensure the safe interval between front and rear trains and prevent dangerous events such as train rear-end collisions. This system is a complex automation system. When the rail transit operation control system breaks down and is out of use, the driver is often required to drive or watch manually to ensure driving safety. When a train passes through curves or up and down slopes, limited by terrain conditions, the lookout distance is short, and it m...

AI Technical Summary

Problems solved by technology

Because radio frequency signal transmission is affected by channel fading and multipath, there is randomness in the received signal strength, so the farthest distance of wireless communication fluctuates greatly, resulting in large fluctuations in the distance between vehicles to prevent rear-end collisions, and there is uncertainty

In the field of urban rail transit, the braking distance of trains does not exceed 200 meters, so the distance between trains to prevent rear-end collisions is relatively short, only 200 to 300 meters. At this distance level, the communication distance of wireless coding transmitter / receiver is more difficult to be accurate. define

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