GPS高程拟合在桥梁施工高程控制网复测中的应用

采用曲面拟合法对武汉市区4座桥梁工程的施工高程控制点进行GPS高程拟合,并与常规水准测量成果进行对比分析。结果表明,采用曲面拟合法进行GPS高程拟合,推算出的水准点高程达到相应等级高程控制网的精度要求,可用于桥梁施工高程控制网施工复测及监理复测。

Application of GPS Height Fitting in Repeating Surveying of the Height Control Net in the Bridges Construction

According to the analysis of the principles and basic methods of GPS height fitting,this paper worked out at the height control points of four bridge projects in Wuhan using surface fitting.The data calculated by height fitting was compared to that calculated by routine river-crossing leveling.The results of comparing show that it can achieve the elevation measurement accuracy of corresponding levels by using the GPS height fitting method,which can be used in repeating survey of the bridge construction control network or repeating survey of supervision.