我国陆地垂线偏差精化计算  

Refined Determination of Vertical Deflection in China Mainland Area

作　　者：宁津生[1] 郭春喜[1] 王斌[2] 王惠民[2] 

机构地区：[1]武汉大学测绘学院,武汉市珞喻路129号430079 [2]国家测绘局大地测量数据处理中心,西安市友谊东路334号710054

出　　处：《武汉大学学报（信息科学版）》2006年第12期1035-1038,共4页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(40074005)

摘　　要：我国天文大地网与高精度GPS2000网进行联合平差时,为满足地面观测数据归算到WGS84椭球的需要,采用移去-恢复技术和高阶次地球重力位模型,应用全国重力资料和30″×30″数字地形模型,完成了参加联合平差的48 919个大地点的相应于WGS84椭球垂线偏差的精化计算,并用115个与天文点重合的GPS点的实测垂线偏差对计算结果进行了外部检验,得到全国垂线偏差子午分量的总体精度为±1.45″,卯酉分量的总体精度为±1.50″。In the simultaneous adjustment of Astro-geodetic network 1980 and China National GPS geodetic control network 2000, in order to reduce the geodetic observation data to the ellipsoid of WGS84, the technique of remove-restore and Earth gravity model is adopted to refined calculate the deflection of the vertical of 48 919 geodetic point in WGS84, by using the gravity data and 30＂× 30＂ DEM in whole country. And the observation deflection of the vertical of 115 astronomic points in WGS84 is used to the exterior precision check. The total accuracy of the deflection of the vertical in a north-south direction is 1.45＂, and that in a east-west direction is 1.50＂. The result has been already used in the simultaneous adjustment of two geodetic networks.

关 键 词：垂线偏差 WGS84 移去恢复技术 

分 类 号：P223.0[天文地球—大地测量学与测量工程] P128.1[天文地球—测绘科学与技术]