高速铁路三维自由设站最优测量方法的仿真计算

Simulation calculation of optimal measurement method using 3-dimensional free stations for high speed railway

自由设站测量在高速铁路轨道施工中应用广泛,是实现高速铁路高平顺性的重要技术保障之一,因此如何通过合理测量与平差得到正确的自由设站点坐标和进行精度的客观评定十分重要。通过仿真计算,认为当自由设站起算数据含有误差时,自由设站测量时设站点应尽量设置在所观测CPⅢ点构成的网形的几何中心,平差前应根据稳定性检验结果,确定正确的起算数据,平差计算时采用方差分量估计进行定权,这样将更合理地利用起算数据和观测值,从而得到正确的设站点坐标和精度评定,以保证轨道精调测量等工作的顺利进行。

The free station,widely used in ballastless track construction,is the key technical support for the realization of high smoothness in high-speed railway,which means it is very important to get the right free station coordinates and the objective precision evaluation by the reasonable measurement and adjustment.Through the simulation calculation,this paper concluded that the free station point should be set in the geometric center of the observation CPⅢ points when the initial data of the free station contains the error,and the correct initial data should be determined according to the stability test results before the adjustment,and the initial data and observation value will be used appropriately by using variance component estimation for fixed weight during the adjustment,which results in getting the right station coordinates and precision evaluation and ensuring the implementation of ballastless track precise adjustment measurement.