基于最大偏差准则的列车卫星定位完好性监测方法

GNSS-based Train Localization Integrity Monitoring Analysis Method Considering Maximum Offset Principle

卫星定位实现列车运行状态的自主感知是下一代列车运行控制系统的重要发展方向。基于卫星的车载定位方式能够有效减少轨旁设备,降低建设和维护成本,提升列车定位的自主性和可信性。卫星定位应用需要符合铁路的安全性要求,为实现卫星定位列控应用的安全评估进行卫星定位完好性监测,研究了卫星导航领域与铁路电子电气设备领域已有的规范和标准,考虑测量噪声对水平保护级别的影响,提出基于最大偏差准则的完好性监测算法。实测结果表明,基于最大偏差准则的完好性监测算法能够有效保障定位结果的完好性,降低出现非安全漏报的风险,为卫星定位铁路安全应用完好性监测和安全完整性分析提供一定的参考。

GNSS-based localization technique to achieve train operation self-perception is a vital direction for the next generation of train control. GNSS on train borne side for train localization can effectively reduce trackside equipment, cut off construction and maintenance costs, and improve the dependability of the train location. In GNSS-based train localization application scenarios, train localization function should conform stringent safety requirements. In order to assess the functional safety performance of GNSS for train control, integrity monitoring for GNSS-based localization was carried out and the current mainstream regulation and standards both in GNSS and railway domains were studied, considering the effect of different measured noise levels on the Horizontal Protection Level (HPL). The integrity monitoring algorithm considering maximum offset principle was proposed. The results show that the integrity monitoring algorithm proposed in this paper can efficiently ensure the integrity performance of the location results, lower the missed safety alarm risks, thus providing reference value for the application of train localization integrity monitoring and safety integrity analysis.