为了解决在特大桥隧工程建设中远距离高程基准传递的难题,介绍带高程基准参数的GPS水准拟合方法,给出拟合函数、计算公式及精度估算公式.通过3个大跨度桥梁高程控制的计算实例验证方法的可靠性,证明方法能同时获得局部似大地水准面模型和高程基准参数,解算高程基准参数的精度优于公路桥位勘测设计规程中桥梁高程控制测量的限差要求.%A key problem in long span bridge and tunnel engineering is to transfer height datum across the obstacle with long distance. In order to solve the problem, GPS leveling fitting method with additional pa rameter is presented. Fitting functions and equations are given in this paper. Feasibility of the proposed method is validated by practical data of numerical engineering. The method can obtain the height datum parameter and local quasigeoid model at the same time. It is verified that parameters of the fitting model and fitting standard deviation have no connection with height datum. This method can also be used to vali date the reliability of other methods for across sea leveling surveying. Accuracy of the height datum calcu lated by the proposed method can reach the demand of national order leveling; therefore it can be applied in practical engineering.
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