CGO软件加载EGM2008重力场模型在GNSS高程拟合中的应用  

Application of EGM2008 Gravity Field Model Loaded by CGO Software in GNSS Elevation Fitting

作　　者：徐涛[1] Xu Tao(Shaanxi Province Institute of Water Resources and Electric Power Investigation and Design,Xi'an 710001,Shaanxi)

机构地区：[1]陕西省水利电力勘测设计研究院,陕西西安710001

出　　处：《陕西水利》2023年第12期88-91,共4页Shaanxi Water Resources

摘　　要：水准测量和三角高程测量精度较高,但均费时费力,效率相对较低,快速高精度地获取控制点的高程是工程测量领域研究较多的课题。使用华测CGO软件加载EGM2008重力场模型解算工程GNSS控制网,解算后的高程为经过EGM2008重力异常改正后的大地高,再引入少数GNSS高程点,进行高程拟合,获得剩余高程异常,最终得到经过两项改正后GNSS点的正常高。通过几个案例数据的计算分析,表明该方法获得的高程可以达到图根高程控制测量的精度,且精度优于直接进行GNSS高程拟合的高程精度。Leveling and triangulation leveling have high precision,but they are both time-consuming and laborious,and their efficiency is relatively low.It is a research topic in the field of engineering surveying to obtain the elevation of control points quickly and accurately.The EGM2008 gravity field model was loaded with CGO sofware to solve the engineering GNSS control network,and the height after solution was the earth height corrected by EGM2008 gravity anomaly.A few GNSS elevation points were introduced to carry out elevation fitting,and the remaining elevation anomalies were obtained.Finally,the normal height of GNSS points after two corrections was obtained.Through the calculation and analysis of several cases,it is shown that the height obtained by this method can reach the precision of the height control measurement of the graph root,and the accuracy is better than that of the GNSS height fitting directly.

关 键 词：EGM2008 GNSS高程拟合 高程异常 模型外符合中误差 

分 类 号：P228.4[天文地球—大地测量学与测量工程]