在城市轨道交通信号系统中，为了保证运营安全，CBTC列车降级后，ZC判断列车可能占用位置时会以牺牲精度为代价，以计轴为单位判断非通信车的占用位置，将占用计轴的两侧空闲计轴均作为非通信列车可能运行范围。本论文对该方案进行了改进，提出了一种在ZC和CI设备融合基础上判断列车占用位置的新方法，实现了列车占用位置的精细化管理，提高了列车占用位置的精度，可适应CBTC混跑模式下更小间隔、更高速度的线路应用需求，同时可提高判断计轴设备故障的准确度，对提升CBTC系统的可靠性与可用性具有一定的参考价值。

In the signal system of urban rail transit, in order to ensure the safety of train services, ZC estimates the occupation position of non-communication train at the cost of accuracy after the train running in CBTC level is degraded, it takes the axle counter as the unit to judge the occupation position of non-communication train, and takes the idle axle counter on both sides of the occupied axle counter as the possible occupation range of non-communication train. This paper improves the scheme and proposes a new method to judge the train occupation position based on the integration of ZC and CI equipment. It realizes the fine management of the train occupation position and improves the accuracy of the train occupation position, so it can meet the application requirements of the line with smaller interval and higher speed under the CBTC mixed running mode. At the same time, it can improve the accuracy of judging the failure of axle counter equipment. In brief, this paper has some reference value for improving the reliability and availability of CBTC system.

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