北斗星基和地基增强系统在宜涪高铁中的应用

Application of BDS Satellite-ground Augmentation System in Yichang-Fuling High-speed Railway

针对山区铁路定位难题,基于宜昌至涪陵高铁项目,探讨北斗卫星导航系统中地基增强和星基增强技术的应用效果。首先,介绍山区铁路定位困难的原因,分析卫星定位在铁路安全运行和线路管理中的重要性;然后,详细描述基于地基增强系统和星基增强系统的空间定位精度测试方法。测试结果显示,基于北斗地基增强定位系统精度表现优异,内符合中误差<1 cm,外符合中误差≤2 cm;而基于北斗星基增强系统定位平均收敛时间在3 min以内,内符合中误差≤2 cm,外符合中误差<3 cm。研究结果表明,宜涪高铁星/地基增强联合定位能够满足铁路勘测的要求,在山区铁路的实际应用中具有广阔的发展前景。

Addressing the positioning challenges for mountainous railways,based on the Yichang-Fuling High-speed Railway project,this paper discussed the application effects of ground-based augmentation and satellite-based augmentation technologies of the Beidou Satellite Navigation System.Firstly,it introduced the background of the difficulties in positioning mountain railways and analyzed the importance of satellite positioning in the safe operation and line management of railways.Then,it described in detail the spatial positioning accuracy testing methods based on ground-based augmentation systems and satellite-based augmentation systems.The test results show that,the positioning accuracy of the Beidou ground-based augmentation positioning system is excellent,with an internal consistency median error of less than 1 cm and an external consistency median error of 2 cm or less.The average convergence time of the Beidou satellitebased augmentation system is within 3 minutes,with an internal consistency median error of 2 cm or less,and an external consistency median error of less than 3 cm.The research results indicate that the combined ground and satellite-based augmentation positioning of the Yichang-Fuling High-speed Railway can meet the requirements of railway surveying and has broad development prospects in the practical application of mountain railways.