GPS水准多项式曲线拟合在水利工程中的应用

APPLICATION OF GPS LEVEL POLYNOMIAL CURVE FITTING IN WATER CONSERVANCY

随着GPS应用技术的不断成熟,GPS定位测量获得大地高精度在逐渐提高。如何有效利用GPS水准测量把GPS高程转换成工程所需的正常高,成为了水利测量工作者非常关心的问题。本文以淮北矿业集团临涣工业基地引水工程为实例,采取多项式曲线方法进行了GPS水准拟合的深入研究,最后得出结论:在地形起伏不大的平原地区,通过多项式曲线拟合,所获得的正常高结果可以满足四等水准的精度要求,在带状测区的水利工程中可以取代几何水准测量。

With ever-increasingly mature GSP application technology,the precision of geodetic height obtained by GPS positioning survey improves gradually.How to trnasfer GPS elevation into normal height by effectively using GPS level measurement becomes a key issue of concern of water conservancy surveyers.This paper,taking an example from diversion engineering of the Linhuan industrial base of the Huaibei Mining Group,made a thorough reaserch into GPS level fitting using polynomial curve method,and concluded that in a gentle plain area,the normal height obtained from polynomial curve fitting meets the level-4 precision and can be used in water conservancy project in banded area in stead of geometrical level measurement.