GPS水准在西部库区确定高程控制点中的应用  

Application of GPS Leveling Method in Determining Elevation Control Points in Western Reservoir Area

作　　者：边志刚 曲萌 BIAN Zhigang;QU Meng(Tianjin Maritime Surveying and Mapping Center,Northern Navigation Service Center,Maritime SafetyAdministration,Tianjin 300222,China)

机构地区：[1]交通运输部北海航海保障中心天津海事测绘中心,天津300222

出　　处：《测绘与空间地理信息》2021年第8期176-178,共3页Geomatics & Spatial Information Technology

摘　　要：在我国西部山区,受地形起伏影响,很难通过传统的几何水准连测方式获取固定点的正常高,全球定位系统(GPS)技术的发展,使得大地测量发生了一场技术革命,可以全天候、实时提供可靠的地球三维坐标、三维角速度和时间信息。GPS高程精度的核心是评估高程异常值的精度,本文通过西部库区布设GPS平高控制点,利用区域似大地水准面精化模型实现了应用GPS水准法获取了高精度的正常高,并通过外符合检核方式评估其精度达到四等几何水准精度要求。In the mountains of western China,affected by topographic relief,it is difficult to obtain the normal height of fixed point by the traditional method of continuous geometric leveling.With the development of global positioning system(GPS)technology,geodesy has undergone a technological revolution,it can provide reliable three-dimensional coordinates of the earth,three-dimensional angular velocity and time information in all-weather and real-time.The core of GPS elevation accuracy is to evaluate the accuracy of elevation outliers.In this paper,by setting up GPS level control points in the western reservoir area and using the regional geoid refinement model,the normal height with high accuracy is obtained by using GPS level method,and the accuracy is evaluated by the method of external conformity inspection to meet the requirements of fourth-grade geometric level accuracy.

关 键 词：GPS水准 正常高 高程异常 精度 

分 类 号：P228.4[天文地球—大地测量学与测量工程]