GNSS高程代替五等水准在既有铁路改造工程勘测项目中的应用

Application of GNSS elevation instead of the fifth grade leveling elevation inthe survey project of existing railway renovation project

全球卫星导航系统实时动态(GNSS-RTK)技术已广泛应用于各工程领域测量中,文中简述了GNSS-RTK技术在铁路改造项目中应用的原理和优点.利用区域控制网对水准点进行采集,将成果添加到点校正集中进行后校正.将既有铁路改造项目与水准测量高程成果数据进行对比,得出通过增加一定数量的高程点、参与点进行校正.RTK高程能够达到五等水准高程的精度,在平原或山区地带类似项目应用中具有一定的借鉴意义.

Real time dynamics of Global Satellite Navigation System(GNSS-RTK)technology has been widely used in various engineering fields.This article describes the principle and advantages of GNSS-RTK technology in railway reconstruction projects.Regional control network is used to collect leveling points,and the results are added to the point correction concentration for post-correction.By comparing the results of existing railway reconstruction projects with those of leveling survey,it is concluded that RTK elevation can reach the accuracy of the fifth grade leveling elevation by adding a certain number of elevation points to participate in point correction,the similar project application has the certain reference significance in the plain or the mountainous area.