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...

Images