GNSS 高程二次曲面拟合技术在工程中的应用

摘要

Through a brief description of the definition of a variety of elevation system and based on the analysis of the normal height system, earth height system measurement theory and its similarity and difference and in accord with the principle of least square method and quadratic surface fitting equation method, , this paper has established the height anomaly quadratic surface fitting equation in the practical project and realized the inner precision, the outer precision and the conventional leveling precision statistics for the quadratic surface fitting equation by using a small amount of uniform control points, so that the precision can reach four grade leveling measurement requirements. Meanwhile, combined with the engineering experience, the paper puts forward insights and advice to improve the quadratic surface fitting technical precision with focus on the factors which affect the quadratic surface fitting technology.%　　简述各种高程系统的定义，在对正常高系统和大地高系统测量理论及其异同分析的基础上，根据最小二乘法原理以及二次曲面拟合方程计算方法，利用少量且均匀的控制点，在实际工程中建立高程异常二次曲面拟合方程，对二次曲面拟合方程进行内符合精度、外符合精度、常规水准测量精度统计，精度能够达到四等水准测量要求。同时针对影响二次曲面拟合技术的因素，结合工程经验，对提高二次曲面拟合技术精度提出意见和见解