贵阳市似大地水准面精化项目建设

为解决CORS系统中GNSS高程受技术条件限制精度不高的问题,贵阳市进行了区域似大地水准面精化工作。本文论述了GNSS和水准网的布设及精度,使用了3 877个点重力数据和54个GNSS水准资料,以EIGEN03C地球重力场模型作为参考重力场,由第二类Helmert凝集法完成大地水准面计算,利用球冠谐调和分析方法将GNSS水准与重力似大地水准面联合求解得出的2'!2'格网似大地水准面,在高原高差地区其精度达到"0.010 m。

Quasi-geoid Refinement Project of Guiyang Ciyt

In order to solve the question of low accuracy elevation resulted from technical constraints in CORS system ; Guiyang con-ducted the local quasi -geoid refinement project .This paper introduced the layout and accuracy of GPS and leveling networks , used 3 877 points of gravity data and 54 points of GNSS leveling data , and adopted EIGEN03C earth’ s gravitational field model as a reference gravity field, the geoid is calculated by utilizing the Helmert's second method of condensation .Then, through spherical cap harmonic analysis, the 2′×2′grid quasi-geoid refinement model is solved by GNSS leveling and gravimetric quasi -geoid.The Guiyang quasi-geoid refinement model accuracy reaches ±0.010 m in the plateau region and where there exist big height difference .