顾及似大地水准面趋势变化的高程异常拟合方法  

Fitting method of height anomaly considering variation of quasi-geoid

作　　者：赵保成 李国忠 徐坚[1,2] 徐健 肖潇 ZHAO Baocheng;LI Guozhong;XU Jian;XU Jian;XIAO Xiao(Spatial Information Technology Application Department,Yangtze River Scientific Research Institute,Wuhan Hubei 430010,China;Wuhan Center for Intelligent Drainage Engineering Technology Research,Wuhan Hubei 430010,China)

机构地区：[1]长江科学院空间信息技术应用研究所,湖北武汉430010 [2]武汉市智慧流域工程技术研究中心,湖北武汉430010

出　　处：《北京测绘》2022年第11期1449-1454,共6页Beijing Surveying and Mapping

基　　金：国家重点研发专项(2018YFD1100405);长江科学院中央级公益性科研院所基本科研业务费项目(CKSF2019410+KJ,CKSF2019411+KJ,CKSF2019528/KJ);湖北省自然资源厅科技计划(ZRZY2021KJ10)。

摘　　要：全球导航卫星系统(GNSS)使用的高程系统为大地高系统,而在我国实际工程中使用的高程系统为正常高系统。为了使GNSS得到的大地高数据直接应用于实际工程中,需要求解出测点的高精度高程异常值,进而将大地高转换至正常高。本文从高程异常曲面拟合过程中的特征点选取角度出发,基于SGG-UGM-2全球重力场模型及移去恢复型曲面拟合方法,提出了一种顾及似大地水准面趋势变化的高程异常拟合方法。经过武汉某沿河实验区实例验证,本文提出的高程异常拟合方法拟合精度损失小,拟合中误差达到±0.014 m,完全满足绝大多数工程测量需求。The height system used in global navigation satellite system(GNSS)was the geodetic height system,while the height system used in practical engineering in China was the normal height system.To convert geodetic height to normal height and make GNSS geodetic height data applied to practical engineering directly,it was necessary to acquire high-precision height anomaly of measuring points.Based on The SGG-UGM-2 global gravitational model and remove-restore curved surface fitting method,a new height anomaly fitting method that considers the variation of quasi-geoid was proposed in this paper.The method was verified by a practical example in Wuhan.The result showed that the fitting precision loss was small,the fitting error was±0.014m,and the method proposed in this paper could meet a majority of engineering measurements.

关 键 词：高程系统 高程异常 重力场模型 拟合 

分 类 号：P228.4[天文地球—大地测量学与测量工程]