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中文摘要：
应答器在欧洲列车运行控制系统ETCS（European Train Control System）和中国列车运行控制系统CTCS（China Train Control System）中都是重要的定位设备。为了提高定位精度,应答器必须高密度地布设在轨道上,增加了系统的建设成本和后期维护量。基于GNSS技术的虚拟应答器是采用GNSS接收机和相关软件实现应答器的功能,用于模拟一个真正放置在轨道上的应答器,保证列车运行的安全,提高列车定位的精度,降低建设成本和后期维护量。本文对虚拟应答器捕获半径的数学公式进行推导,在此基础上对捕获算法进行设计。通过设置仿真场景,分析接收机的输出频率、列车速度以及捕获率与捕获精度之间的关系,验证算法的可行性。
英文摘要：
Eurobalises have been widely used for train positioning in ETCS and CTCS.In order to improve the precision of positioning,a large number of track-side devices have to be equipped,which would lead to high costs for construction and maintenance.Then the virtual balise solution is proposed,in which the high accuracy GNSS receiver and relevant software are combined to realize the function of the traditional balise,guaranteeing safety,improving positioning accuracy and reducing costs of construction and maintenance.In this paper,the acquisition radius of the virtual balise is analyzed,and then the corresponding acquisition algorithm is designed.Simulations are made at certain receiver frequency and train velocity.On the basis of the relation between acquisition rate and precision,the proposed algorithm is proved feasible and applicable.
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