列车定位是现代高速智能铁路列控系统的关键问题之一，研究该问题对高速铁路列控系统的优化控制、降低建造与维护成本、提高运营效率都有着重要作用。大量依赖铁路轨旁设备的定位方式在成本上给铁路建造与维护带来巨大压力，同时，在技术上也难以满足现代高速列车运行安全需求。本课题以我国CTCS3为基础，利用GNSS的先天优势，采用多传感器组合定位方法，建立基于GNSS的高速列车多源信息融合定位模型；基于 GNSS定位技术，开展列控系统相关优化控制研究；研究基于Bayes滤波的非线性PF-CKF混合法，满足适合高速列车运行过程特性的精确定位；研究 GNSS安全标准融入铁路RAMS规范框架，为GNSS应用于铁路领域安全完整性提供理论基础；构建基于GNSS 的多传感器组合定位平台，通过仿真和试验验证并改进相关理论研究结果。课题研究将为我国高速铁路列控系统理论与应用研究奠定基础，为高速列车定位建模与优化探索新途径。

The train positioning is one of the key problems in modern intelligent high-speed railway train control system,research on these problems have important effects on the optimization and control of high-speed railway train control system、reduce the construction and maintenance costs、improve the operation efficiency.Heavily rely on the positioning mode of the railway wayside equipment has brought great pressures on the railway construction and maintenance.At the same time,this technology also can not meet the demand of modern high-speed train operation safety.This paper is based on the CTCS3,using the advantage of GNSS,with the method of multi sensor combination positioning,establish the positioning model of the high-speed train with multi-source information fusion based on GNSS;Based on the technology of GNSS,carry out the research on the optimization control of the train control system;Research on the mix method of nonlinear PF-CKF based on Bayes filter,to meet the precise positioning for the characteristic of the process of the high-speed train;Research on GNSS safety standards into the railway RAMS frame,provide a theoretical basis for the application of GNSS on railway safety and integrity;Construction the multi sensor combination positioning platform based on GNSS,by means of simulation and experiment to verify and improve the related theoretical results.The research will lay a foundation for the theory and application of the high-speed railway control system in China,to explore a new way to modeling and optimization of high speed train positioning.