This paper introduces different signal block modes and the method which was used to calculate tracking intervals between trains, and establishes simulation system for multi-train tracking.
介绍了城市轨道交通不同信号闭塞方式及其追踪列车间隔时间的计算方法，建立了多列车追踪运行的仿真系统，并进行了算例的设计。
Frequency tracking means that sampling intervals of following sampling is updated according to new frequency estimation, so synchronous sampling error will be reduce step by step.
频率跟踪就是依据前一次频率估计修改下一次采样的采样间隔，从而使同步偏差越来越小。
Surveillance systems tracking multiple targets often do not have the sensing or computational resources to apply all sensors to all targets in the allocated time intervals.
由于传感器资源或计算资源的限制，监视系统在跟踪多目标时通常不能同时为每个目标分配所有的传感器。
We analyze the time intervals during which the heliostat requires faster tracking speed, and discuss the causes and possible solutions.
我们分析了定日镜需要快速跟踪的时间段，并讨论了这个问题的成因和可能的解决方案。
We analyze the time intervals during which the heliostat requires faster tracking speed, and discuss the causes and possible solutions.
我们分析了定日镜需要快速跟踪的时间段，并讨论了这个问题的成因和可能的解决方案。
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