摘要
为实际GPS测量提供布设GPS水准点的理论依据,研究了区域性似大地水准面GPS点密度与精度的关系:1)根据不同密度,把GPS水准点分为拟合点和检查点两种,用检查点与用拟合点所得到的似大地水准面内插得到的高程比较,得到大地水准面的精度;2)分别采用六参数法、多面函数法、移动曲面拟合法、有限元法4种方法拟合似大地水准面,并用检查点数据评定大地水准面精度;3)通过对实测数据的计算分析得到结论,实测三等水准联合GPS高程观测,拟合大地水准面的精度优于2cm;内插的正常高可取代四等水准测量;密度分辨率为2000m,用有限元法拟合出的似大地水准面和GPS正常高能代替四等水准测量。
The aim of this study is to find out the relation between density of GPS leveling points and interpolation error, and to provide scientific basis for planning GPS leveling network and three following chief contents are given. （1） The GPS leveling points are divided into two groups ,one is called fitting points that are used to fitting guasi - geoid, and those in another group are called check points that are used to check the interpolation error. （2） Using four fitting methods with six parameters, Multi-curve function, Moving curve and fitting element method to fit the local quasi-geoid and the fitting accuracy will be evaluated with the check points. （3） Through the calculation and analysis, the anwsers are： a） The accuracy of local quasi-geoid is higher than 2 centimetre with practical third grade leveling combining with GPS; b）Interpolated nomal height can take place of fourth grade leveling when GPS density resolutions are 1 000 meter, 1 250 meter andl 500 meter;c）When the resolution is 2 000 meters, the inter- polation nomal height can take place of fourth grade leveling only by use of finite the limted element method.
出处
《大地测量与地球动力学》
CSCD
北大核心
2008年第5期50-54,共5页
Journal of Geodesy and Geodynamics
基金
山东省自然科学基金(2004ZX231)
作者简介
姚吉利，1964年生，教授，主要从事于测量数据处理方面的研究．E—mail：ysy_941123@sdut．edu．cn
