基于双圆法区域划分的高精度GPS匹配算法

High-precision GPS Matching Algorithm Based on Two-circle Method Regional Division

在轨道交通站场中,目前的地图匹配算法普遍存在定位误差大、定位数据漂移等问题,无法有效实现站场人员的高精度匹配定位。为此,本文在分析站场拓扑结构的基础上,提出一种基于双圆法的站场区域划分方法。该方法将站场图划分成若干个阵列矩形小区域,通过一对同心圆和单个矩形区域结合获得待匹配轨道段,在此基础上实现直线及曲线轨道匹配。实验结果表明,该方法可使匹配准确率提高至96.875%,GPS定位匹配精度达到2m,可较大改善地图匹配,有效降低定位误差和定位数据漂移。

Large positioning errors and positioning data drift are the general problems of the map matching algo- rithm currently applied for positioning in railway stations ＆ yards, so high-precision positioning of on-site staff can not be effectively achieved. In this paper, by analysis of the station ＆ yard topology, the map matching al- gorithm based on the two-circle method was put forward. With this method, the station ＆ yard map was divid- ed into small rectangular array areas, the track segments to be matched were then obtained through combining a pair of concentric circles and one rectangular area, and eventually, straight and curve track matching was a- chieved. The experimental results show that this method can raize the errorless matching rate up to 96. 875 and the GPS matching accuracy up to 2 m, thus greatly improving map-matching and effectively reducing posi- tioning errors and positioning data drift.