不同地形下GNSS高程异常拟合精度分析

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中图分类号：P228.4 文献标志码：A 文章编号：1003-5168(2025)16-0110-05

DOI:10.19968/j.cnki.hnkj.1003-5168.2025.16.022

Analysis of GNSS Height Anomaly FittingAccuracy in Different Terrains

WANG Liming LIU Chaoqun (SiChuan Communication Surveying & Design Institute, Chengdu 61OO17, China)

Abstract:[Purposes] To summarize a set of elevation conversion procedures applicable to diferent terrains,providing reference for subsequent elevation measurement engineering projects.[Methods] Based on road-strip engineering projects in diferent terrains,elevation anomaly fitting was studied using GAMIT/GLOBK and EGM2008 model with different fiting methods and public elevation points.[Findings] The results show that compared with ordinary baseline processing software, using GAMIT/GLOBK with IGS station data for height anomaly calculation improves accuracy from meter-level to decimeteror centimeter-level.For plain areas,elevation fiting with a small number of known points can meet the elevation specifications of low-grade highways; for plateau areas,higher requirements for known points apply,and the constant model or quadratic surface model is recommended; for high mountain areas,the selection of known points requires strict criteria,and the quadratic surface model is preferred.[Conclusions] This workflow requires only afew known points to obtain elevation data for the entire survey area within specified accuracy, significantly reducing field survey intensity.

Keywords: height anomaly; GAMIT/GLOBK; EGM2OO8 model; engineering surveying

0 引言

角高程测量，易受地形限制，存在流程烦琐、成本高、效率低等局限性。（剩余7368字）