地图辅助定位方法在列车定位中的应用

地图辅助定位是使用道路地图矢量辅助其它手段进行车辆定位的一种方法。本文依据线路平纵断面特征对线路进行单调分段后,建立线路平面和纵断面数字地图数据库,然后以铁路线路平面特征辅助GPS进行列车连续定位,分别推导出直线、缓和曲线以及圆曲线区段的列车位置估算公式。在直线区段将GPS位置信息投影到实际线路上进行列车定位;在缓和曲线上,根据实测当前点曲率以及缓和曲线曲率和全长计算列车的位置;在圆曲线上,提出利用同向切线法实现列车连续定位的方法。文中还探讨了应用纵断面变坡点作为虚拟查询应答器实现单点定位的方法。最后给出列车连续定位的现场实验结果和利用变坡点实现单点定位的仿真结果,验证了方法的有效性。

Map Aided Positioning Method Used in Train Locating Application

Map aided positioning utilizes road map vectors to help other positioning means getting a vehicle's exact location.In this paper,the rail line is divided into many monotone segments according to the parameters of plane and vertical sections.These parameters are extracted and stored in the digital map database.The plane parameters are used to help GPS to get the continuous train positions.The train positioning estimation formulas are given for different parts of the rail line.On the tangent track,the GPS positioning information is projected to the real track to estimate the train position.On the spiral curve,the location is calculated through the measured and pre-stored curvatures and lengths.On the circlular curve,the same-direction tangent method is proposed to get the train location with the course of GPS and pre-stored in the database.This paper also introduces a method using the gradient change points of vertical sections for the virtual transponder to realize single point locating.Finally,the field test results of continuous train locating and simulation results of single point locating with grade information are given to demonstrate the validity of the proposed algorithm.