基于GNSS的列车定位能够有效降低运营和维护成本，改善铁路安全。从GNSS应用于高速列车定位面临的问题入手，在分析列车定位有效性与安全完整性基础上，探讨构建以GNSS为主的多传感器组合定位模型，采用自适应的联合Kalman滤波算法，解决GNSS定位有效性问题；根据铁路安全规范，运用故障模型分析手段，探索GNSS安全标准与铁路RAMS规范内在关联机理，解决GNSS定位安全完整性问题，为GNSS安全应用于我国高速铁路系统奠定理论基础。%GNSS-based train positioning can effectively reduce operation and maintenance cost,improve the safety of railway. Starting from the problems of applying the GNSS to high-speed train location,based on the analysis of the existing train positioning availability and safety integrity,this paper discusses the construction of GNSS-based multi-sensors integrated positioning model,and the GNSS positioning availability through adap-tive Federal Kalman filtering algorithm. According to railway safety standards,by using the failure modes analy-sis,it explores the internal conjunctive mechanism between GNSS safety standards and railway RAMS(reliabil-ity,availability,maintainability and safety),solving the GNSS positioning safety integrity issue,which would lay theoretical foundation for safety application of GNSS in China's high speed railway system.
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