测绘科学技术学报2025，Vol.41Issue(6)：566-573,8.DOI:10.3969/j.issn.1673-6338.2025.06.003
基于地球重力场确定GNSS点位正常高的多种方法比较及改进
Comparison and Improvement of Various Methods for Determining GNSS Geoid Heights Based on the Earth's Gravity Field
摘要
Abstract
The determination of GNSS geoid heights plays a crucial role in achieving true three-dimensional GNSS positioning.This paper systematically evaluates the accuracy of geoid height calculation methods related to the Earth's gravity field,including the gravity field model method,gravity potential difference method,and gravity da-tum method,under different terrain conditions.The paper focuses on analyzing the impact of different geoid refer-ence surfaces on the accuracy of the gravity potential difference method,and proposes an improved version of the gravity datum method based on the original approach.The results show that each method varies in terms of preci-sion and applicability.In the case studies presented,the geoid height calculations based on the gravity field models EGM2008 and XGM2019e yielded RMSEs of 0.130 2 and 0.108 8 m in region 1,and 0.354 6 and 0.193 0 m in regions 2,respectively.For the gravity potential difference method based on the 1985 national height datum and its regional height datum,the RMSEs in region 1 were 0.109 6 m and 0.100 3 m,respectivelty,while those in region 2 were 0.227 7 and 0.222 3 m,respectively.When using the gravity potential difference method based on the glob-al mean sea level(GMSL)and its regional height datum,the RMSEs in region 1 were 0.384 5 and 0.099 3 m,and in region 2 were 0.096 5 and 0.092 0 m,respectively.The improved gravity datum method resulted in an RMSE of 0.035 9 m for geoid height differences in region 1,showing a slight improvement compared to the 0.036 1 m RMSE obtained with the gravity potential difference method.关键词
正常高/重力场模型/重力位差法/重力水准法/全球导航卫星系统/地球重力位Key words
geoid height/gravity field model/gravity potential difference method/gravity datum method/GNSS/earth's gravitational potential分类
天文与地球科学引用本文复制引用
龙小林,周亭汐,袁振伟..基于地球重力场确定GNSS点位正常高的多种方法比较及改进[J].测绘科学技术学报,2025,41(6):566-573,8.基金项目
公司自立科研项目(ZLKY2024004). （ZLKY2024004）
