作　　者： ; ; ; ;

机构地区： 西南交通大学

出　　处： 《测绘科学技术学报》 2011年第4期258-261,共4页

摘　　要： 高速铁路中自由设站是在CPⅢ控制网下实现轨道精调施工和轨道检测平顺性的重要技术保障之一。所以研究如何正确地利用自由设站的3类观测值进行平差计算,以得到正确的自由设站坐标及其精度十分重要。对自由设站观测的方向、天顶距、斜距观测值列立误差方程,推导其近似坐标解算公式;对观测值如何定权进行了讨论。采用间接平差结合实测数据,对函数模型以及不同定权方法的正确性进行了验算和分析;验证了函数模型的正确性,并得出3维整体平差和方差分量估计定权,有利于得到正确的自由设站坐标及其精度的结论。 The free station is one of the key technical support for ballastless track precise adjustment and smooth detection with the CPⅢ control network in high-speed railway, so research on how to achieve adjustment calculation correctly using the three kinds of observation of the free station to get the correct free station coordinates and their precisions is very important. The error equation about the direction, zenith angle and slope-distance observations for free station was set up. The solving formula for the approximate coordinates was derived and how to determine the observations weights was discussed. The correctness of the function model and the different methods of estimating weight was checked and analyzed by using indirect adjustment and the measured data. The correctness of the function model was verified, the three-dimensional adjustment calculation was got and the variance component estimation was conductive to get the conclusion of the correct coordinates of free station and their precisions.

关 键 词： 高速铁路 自由设站 近似坐标 方差分量估计 精度评定

领　　域： [天文地球]