Rail traffic vehicle-ground communication system and method

Abstract

The invention provides a rail traffic vehicle-ground communication system and method. The rail traffic vehicle-ground communication system includes a vehicle-mounted access device, a rail-side accessdevice, and a rail-side region controller; the vehicle-mounted access device and the rail-side access device can achieve wireless two way communication; the rail-side access device can achieve connection communication with the rail-side region controller through a rail-side backbone network; the vehicle-mounted access device includes a vehicle-mounted access unit and a vehicle-mounted antenna; thevehicle-mounted access unit communicates with the rail-side access device through the vehicle-mounted antenna; the rail-side access device includes a rail-side access unit and one or more phased-array antennae; the rail-side access unit can acquire location information of trains in a coverage range of the phased-array antennae through the rail-side region controller, can control and adjust the number of phased-array antenna composed beams and the angle of each beam in real time according to the location information of the trains so as to allow the phased-array antennae to meet the communication range of the vehicle-mounted antenna of the trains, and can controls communication between the phased-array antennae and the vehicle-mounted access device. The rail traffic vehicle-ground communication system and method can enlarge a communication coverage range of a CBTC system, and can achieve remote, large-range and high-quality communication.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of rail transit communication, and in particular to a rail transit vehicle-to-ground communication system and method. Background technique [0002] In the field of rail transit, the CBTC (communication-based train control) system utilizes continuous, large-capacity train-to-ground two-way reliable data communication to realize wireless transmission of train control information and train status information. It is an advanced automatic train control system. The DCS (Data Communication System) subsystem realizes two-way, continuous, high-speed, and safe information interaction between the vehicle and the ground, and carries important data information directly related to driving safety. It is the core of the CBTC system. [0003] At present, the DCS used in domestic rail transit generally adopts fixed directional or omnidirectional antennas, and the angle of antenna communication is unc...

AI Technical Summary

Problems solved by technology

[0005] 1. Since the transmission power of the vehicle-ground antenna port is limited by laws and regulations, in order to reduce the construction cost of ground communication equipment, it is necessary for a single antenna to cover a large enough distance from far to near, which requires an increase in the direction angle of the antenna, but the antenna direction angle is enlarged The antenna gain decreases accordingly, and the communication coverage may not increase but decrease. Therefore, it is difficult for traditional directional antennas to achieve long coverage and large antenna gain at the same time when the port transmission power remains unchanged.

[0006] 2. In order to ensure the coverage of the antenna, the current rail transit ground antenna system usually uses a directional antenna with a large direction angle, but increasing the antenna angle will easily receive interference from other signals, especially the WLAN communication system using the public frequency band

[0007] 3. Traditional phased array antennas use concentrated beams to achieve high-gain long-distance communication. By constantly changing the antenna beam angle and scanning back and forth, a larger communication range is achieved. The beam angle control of the antenna generally judges its direction by receiving signals. However, this kind of antenna has a complicated structure and a large volume, and the cost increases accordingly.

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