CBTC (communication based train control system) wireless communication system and method

Abstract

The invention discloses a CBTC (communication based train control system) wireless communication system and method. An AP (access point) access module comprises an AP signal search module, an AP communication module, a first AP signal intensity judgment module, a second AP signal intensity judgment module and an AP communication reconnection module; the AP communication module is used for connecting an AP having the strongest signal intensity and searched by the AP signal search module; the first AP signal intensity judgment module is used for judging the signal intensity of the AP in connection; the second AP signal intensity judgment module is used for judging the signal intensity of the AP with the strongest signal intensity; the AP communication reconnection module is used for disconnecting the connection between a vehicle-mounted wireless radio of a CBTC and the connected AP in connection. By reasonably arranging the AP interval and judging the signal intensity of the AP, better redundancy coverage of a train is better ensured and the stable communication is kept stable under the high-speed state of the train, and the communication antijamming capacity is greatly improved by using a frequency hopping technology.

Description

technical field [0001] The present invention relates to a CBTC (Communication Based Train Control System) wireless communication system and method. Background technique [0002] The existing urban rail transit signal system mainly uses DSSS (Direct Sequence Spread Spectrum) direct sequence spread spectrum for vehicle-ground communication. Spectrum, and despread with the same spread spectrum code sequence at the receiving end, and restore the expanded spread spectrum signal to the original signal. It is characterized by a large communication bandwidth, but due to the fixed carrier frequency and low wireless power density, it is easily interfered by various wireless signals, resulting in the loss of vehicle-to-ground communication. [0003] On the other hand, there is no clear standard for the setting of the existing AP (wireless access point, Access Point), and the setting of the AP distance is too small, which will easily lead to frequent roaming and switching of APs when t...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art that are susceptible to interference and unstable or the redundant coverage is not up to standard, and provide a CBTC wireless communication system and method with more stable signal, better redundant coverage and less susceptible to interference

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