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将全球定位系统(GPS)和地理信息系统(GIS)结合在一起应用于轨道交通中,可提高列车定位精度、减少轨旁设备、降低建设和维护成本。一份结构合理的数字轨道地图可以提高列车定位的实时性和准确性。本文主要研究数字轨道地图的模型、设计和验证。首先,结合拓扑关系数据模型和面向对象数据模型的优点,对数字轨道地图进行建模;基于图论和面向对象的数据结构的思想,利用空间数据和对象属性数据实现数字轨道地图的设计。其次,结合图的深度优先搜索算法,提出对数字轨道地图连通性、合理性和正确性进行验证的算法。最后,本文在VC++平台下实现数字轨道地图的功能,并采用丰沙线三家店车站现场采集的GPS数据对数字轨道地图进行实验验证。结果表明本文提出的设计方法是可行的。
The combination of a Global Positioning System (GPS) and a Geographic Information System (GIS) for rail transit can improve train positioning accuracy, reduce trackside equipment and reduce construction and maintenance costs. A well-structured digital orbit map can improve the real-time and accuracy of train positioning. This paper mainly studies the model, design and verification of digital orbit map. Firstly, the digital orbit map is modeled by combining the advantages of the topological relational data model and object-oriented data model. Based on the theory of graph theory and object-oriented data structure, the digital orbit map is designed by using the spatial data and the object attribute data. Secondly, combined with the depth-first search algorithm of map, the algorithm of verifying connectivity, rationality and correctness of digital orbit map is proposed. Finally, this paper implements the function of digital orbit map under the platform of VC ++ and verifies the digital orbit map by GPS data collected at the scene of Sanjiandian station in Fengsha. The results show that the design method proposed in this paper is feasible.