Analysis Of The Influence Of High-speed Condition On Ground-Train Continuous Information Transmission

ABSTRACT:The ZPW-2000A type jointless track circuit works together with track circuit reader (TCR) to realize the ground-vehicle transmission of continuous track circuit information, and both play an important role in Chinese Train Control System (CTCS). The development of china railway and the enhancement of train operation speed bring forward higher safety requirement for railway transportation. However, the current research work at home and abroad is still blank in the research of influence of train speed on the process of ground-vehicle transmission of continuous information, particularly in the case of high speed railway operation. Therefore, this paper builds the process of ground-vehicle transmission of continuous information into models and studies the influence of train speed on the information transmission process based on the models. The research has significant practical meaning and theoretical research merits. The main work of this paper is as follows:(1) The overall process of ground-vehicle continuous information transmission is modeled based on transmission line and electromagnetic theory, and the amplitude model and phase model of the process are obtained. It mainly including the following parts:a model for the short-circuit current signals between the shunted point of the track circuit and the sending end of the track circuit is built based on the fundamental structure and working principle of ZPW-2000A jointless track circuit and TCR. Then, the modeling of the electromagnetic induction process between track circuit and TCR receiving antenna is established using electromagnetic theory, and the effective distance of induction of track circuit signal to TCR receiving antenna is obtained. According to the signal transmission and sampling segments in TCR, the TCR is modeled and thus the sampled signal is available.(2) Based on the models of amplitude of the process established above, the characteristics of the influence of train speed, compensation capacitor, ballast resistance and shunt resistance etc. on the amplitude is analyzed.(3) Based on the models of phase of the process established above, the regression model of phase of the process is proposed. the influence of main factor such as train speed and propagation constant compensation unit on the frequency of TCR sampled signal is mainly analyzed.(4) Experimental results with real operation data from railway show the analysis results that the influence of train speed on the amplitude and frequency of the continuous ground-vehicle transmission information reached in the paper are correct.