Interference Research On Cbtcradio Communication System For Rail Transit

Signaling system plays the important role in ensuring the drive safety, enhancing the transport efficiency and is one of key technologies of the urban rail transit system. At present, with the rapid development of wireless technology,the adoption of radio CBTC system in signaling system will definitely become popular, and become development tendency in the future. But, since transmission of the train control signal is based on the radio channel, we must face up with and solve the problem of how to ensure effective and reliable operation of radio CBTC system under the current radio environment and even the radio electromagnetic environment with a more and more severe development trend.First of all, background and future tendency for realization of radio CBTC with application of 2.4GHz/5.8GHz radio technology in rail transit, as well as various 2.4GHz/5.8GHz radio technical systems and structures like FHSS, DSSS, OFDM, etc., various technical realization and characteristics are described in details by this paper. Additionally, the paper introduced the typical wireless network structure, antenna feedback system, equipment characteristic and various technical parameters. Secondly, according to field test data and transmission model & interference analysis model of rail transit CBTC system under various environments like underground tunnel, station hall/platform, ground depot, railway and overground elevated railway, I analyzed the anti-interference performance on CBTC system and other multiple systems. Subsequently, networking suggestions and characteristic analysis are also put forward for the broadband service bearing like CCTV, etc. that has been proposed for rail transit in Shanghai.Finally, the paper put forward some thinkings and strategies for solving the problem of interference in radio CBTC system. Only the stipulation of corresponding technical standards on a foresighted basis by integrating both technical means and management approaches can ensure reliability of the rail transit train control system. The paper is an exploration of the wireless safe field of signaling system in rail transit and has deep and realistic meaning. Meanwhile, the paper has important reference value of realinzing system interconnection, helping to achieve the localization of system equipment.