Integrity of GNSS-based Train Positioning: From GNSS to sensor integration

Jiang Liu, B. Cai, Debiao Lu, Jian Wang
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引用次数: 3

Abstract

Accurate and safe train position determination is of great importance for railway systems. Additionally, it has become one of the biggest challenges for the Safety-of-Life (SoL) services in railway transport systems using GNSS techniques. The critical performance requirements of these services promote the users to develop safe Train Positioning Systems (TPSs), in which integrity has to be highly concerned to real-timely monitor the quality of the TPS results. This paper presents a solution to the problem of integrity monitoring in GNSS-based train positioning with a global prospect. Different from the RAIM (Receiver Autonomous Integrity Monitoring) approach, a novel hierarchical architecture is proposed to expand the RAIM concept to the TPSAIM (Train Positioning System Autonomous Integrity Monitoring) domain, where integrity monitoring is closely correlated with both GNSS navigation computation at the local level and sensor integration at the global level. Integrity monitoring and fault detection with respect to the integration of GNSS and the Dead Reckoning (DR), which can be simply implemented with odometer and gyroscope, are investigated with different coupling structures. Results from simulations based on the field experiment illustrate characters of the proposed TPSAIM solution, and demonstrate its capabilities in terms of the effectiveness, coverage and flexibility with various TPS structures and operation conditions.
基于GNSS的列车定位的完整性:从GNSS到传感器集成
准确、安全的列车位置确定对铁路系统具有重要意义。此外,它已成为使用GNSS技术的铁路运输系统中生命安全(SoL)服务的最大挑战之一。这些服务的关键性能要求促使用户开发安全的列车定位系统(TPS),其中必须高度关注完整性,以实时监控TPS结果的质量。本文提出了一种具有全球前景的基于gnss的列车定位中完整性监测问题的解决方案。与接收机自主完整性监测(RAIM)方法不同,提出了一种新的分层结构,将RAIM概念扩展到列车定位系统自主完整性监测(tppsaim)领域,其中完整性监测与局部GNSS导航计算和全局传感器集成密切相关。采用不同的耦合结构,研究了可通过里程表和陀螺仪简单实现的GNSS与航位推算集成的完整性监测和故障检测问题。基于现场试验的仿真结果验证了所提出的TPSAIM方案的特点,并验证了其在不同TPS结构和运行条件下的有效性、覆盖范围和灵活性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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