样条函数与稳健估计在线路线形识别中的应用

Spline Function and Robust Estimation Applied in Line Type Identification for Railways

利用不同线形的曲率特性采用三次样条函数与稳健估计相结合的方法进行线形类别的识别 ,即首先利用三次样条逼近实际的轨迹 ,由样条函数绘制里程曲率图 ,对里程与曲率数据进行分组稳健平差 ,进而计算不同组直线的交点 ,该点的里程即为不同线形要素交点的里程 ,从而达到线形识别的目的 .还阐明了利用曲率进行线形识别的局限性 .

Line type is identified based on different line type curvature,using the combination method of cubic spline function and robust estimation.The method goes as follows:approaching real orbits by cubic spline,drawing mileage curvature graph by spline function,grouped robust estimation being applied to mileage and curvature data.And then the points of intersection of different group straight lines are calculated.The mileages of these points are the mileages of different line types crossing points.So the goal of line type identification is attained.The limitation of line type identification by curvature is expounded.