3.4. Heuristic train station parking algorithm
In the train stopping stage, we consider the precise positioning information provided by balises, which play an important role in train control systems [17]. In a subway platform, the engineers install several balises on the tracks in front of the train parking point. When a train approaches the station and goes through each balise, the train can receive the precise positioning data from the balise. According to the field data in Yizhuang Line, we find that there are 5 balises installed in the stopping stage and the last balise is installed at the train parking point. We use Si for i ∈ {1, 2, 3, 4, 5} to represent the distance from balise i to the parking point.