Symmetric induction loop bidirectional communication system

Abstract

The invention relates to a rail transit signal system which is used for realizing bidirectional communication between a ground region control center and on-vehicle ATP and ATO equipment, in particular to a symmetric induction loop bidirectional communication system. The system comprises a loop line cable, on-vehicle equipment and ground equipment. The loop line cable is symmetrically paved along the center of two steel rails; crossing points are arranged at every distance; the ground equipment comprises transmitting equipment and receiving equipment which are respectively connected with the region control center by buses; a coupling transformer is arranged between the transmitting equipment and the receiving equipment; and the output of the coupling transformer is connected to a beginning matching device of the loop line cable through a feeder cable. The system uses a transformer-coupled circuit so that signal transmission distance is doubled; and via coupling counteracting, after the signal which is received by the transformer-coupled circuit and returned from the loop line passes through a filter circuit, a ground-to-vehicle signal is substantially filtered and the signal to noise ratio of a vehicle-to-ground signal is greatly improved.

Description

technical field [0001] The invention relates to a rail traffic signal system, which is used to realize two-way communication between a ground district control center and vehicle-mounted ATP and ATO equipment, and in particular relates to a symmetrical induction loop two-way communication system. Background technique [0002] In the urban rail transit signal system, the digital track circuit of the wheel-rail railway can only realize the one-way information transmission of the district control center to the on-board ATP (Automatic Train Protection) equipment. In order to realize the ATO (Automatic Train Operation), Vehicle-to-ground two-way communication equipment must be added at the station platform. This solution not only increases the equipment, but also makes the system more complicated; and for medium and low-speed maglev or monorail trains, the train has no contact with the track, and digital track circuits cannot be used. [0003] The cross-inductive loop line can not...

AI Technical Summary

Problems solved by technology

[0004] The existing cross induction loop adopts an asymmetric induction loop, which can not only realize vehicle-ground two-way communication and positioning functions, but also has a speed measurement function, but at the same time, for speed measurement, the distance between the intersection points of the loop is relatively small, and it is troublesome to lay long lines. In addition, there is only one sending and receiving antenna, and only one set of sending and receiving equipment. When a certain equipment is damaged, the entire system will be paralyzed, and normal communication between the vehicle and the ground will not be possible. This will seriously affect operations and is not suitable for signal applications. control system

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