列车定位中GNSS的RAMS研究与评估

随着全球卫星导航系统GNSS及相关技术的不断发展和铁路运输系统的信息化,基于GNSS的定位技术被逐步引入列车控制系统中,而如何验证及评估其是否满足列车定位的实际需求,是将GNSS应用于列车定位中亟待解决的问题。为解决GNSS性能指标与铁路RAMS指标的映射问题,提出一种平行递进模型下GNSS性能指标与RAMS指标间的完整映射关系模型,并给出GNSS定位单元RAMS各项指标的定量计算方法。结合城市和郊区两段铁路沿线的车载动态实测数据,对两种情境下GNSS定位单元的RAMS性能进行评估,验证映射模型在实际应用中的可行性,为铁路领域GNSS专用测试平台和评估体系的构建提供一定的理论参考。

RAMS Research and Evaluation of GNSS for Train Positioning

With the continuous development of global navigation satellite system(GNSS)and related technologies and the informatization of railway transportation system,GNSS-based positioning technology is gradually introduced into the train control system.Therefore,verification and evaluation of whether GNSS meets the actual requirements of train positioning become an urgent issue in the application of GNSS to train positioning.In order to realize the mapping between GNSS performance indexes and RAMS indexes,this paper proposed a complete model of mapping relation between GNSS performance indexes and RAMS indexes under the parallel progressive model,and gave the quantitative calculation method of RAMS indexes of GNSS location determination unit.Combined with the on-board dynamic measurement data of urban and suburban routes along the railway,the RAMS performance of GNSS location determination unit under the two scenarios was evaluated.The feasibility of the model in practical application was verified.The model can provide some theoretical reference for the construction of GNSS special test platform and evaluation system in the railway sector.