局部GPS水准高程拟合在线路工程中的应用研究

Application of GPS Leveling Height Fitting to Zonal Construction

带状控制网布设是铁路公路建设的关键环节,通过西部海拔较高地区工程实例获取的正常高,结合GPS大地高,拟合计算高程异常,得到点的高程并分析其精度.计算表明:在该地区GPS拟合水准可达到三等水准测量精度,能够满足交通工程施工测量的需要.

The laying-out of the zonal construction control network is a key step in railway and highway construction.This research,by obtaining the normal height from the projects in western high-altitude area,in combination with GPS geodetic height,carries out a fitting calculation of height anomaly,then calculates the normal height of other points whose precision is then given thorough analysis.The result indicates that third-grade-leveling accuracy can be achieved in such areas by using GPS height fitting,which qualifies as a method in construction survey.