用地球位模型和GPS/水准数据确定我国大陆似大地水准面  

Determination of Quasi-geoid in China's Mainland Using Geopotential Model and GPS/Leveling Data

作　　者：魏子卿[1] 王刚[1] 

机构地区：[1]西安测绘研究所,陕西西安710054

出　　处：《测绘学报》2003年第1期1-5,共5页Acta Geodaetica et Cartographica Sinica

摘　　要：用地球位模型和GPS/水准数据确定了我国大陆地区的似大地水准面。采取的方法是,对于每一个GPS/水准点,用地球位模型计算其高程异常值,并与其GPS/水准实测高程异常值比较,得到计算值的改正数,以此改正附近15′×15′格网点上用地球位模型计算的高程异常。方法的实质是将地球位模型计算的似大地水准面拟合于GPS/水准实测的似大地水准面。计算共使用了遍布大陆的950多个GPS/水准点,点间距大约100km。得到的15′×15′似大地水准面的精度,就全国而言,平均好于±0.5m,105°E以东地区接近±0.3m,以西地区接近±0.6m,青藏地区接近±0.5m。We have achieved the quasigeoid in China's Mainland using geopotential model in conjunction with GPS/Leveling data. The method used can be summarized as follows: for each GPS/leveling point, the height anomaly is computed using a geopotential model and compared with the measured value by GPS/leveling, obtaining thus the correction to the computed value. The correction is used to correct the height anomaly of nearby 15′×15′ grids, as calculated by the geopotential model. This method, in essence, is the fitting of the quasigeoid implied by geopotential model to the quasigeoid measured by the GPS/leveling. Over 950 GPS/leveling points distributed over the mainland are utilized with the spacing being about 100 km. The accuracy of such a 15′×15′ quasigeoid is, on the average, better than 0.5 m for the whole mainland, closed to 0.3 m for the east of 105°E, to 0.6 m for the west, and to 0.5 m for the QinghaiTibet plateau.

关 键 词：GPS 水准数据 地球位模型 似大地水准面 中国大陆 全球定位系统 大地测量 

分 类 号：P228.4[天文地球—大地测量学与测量工程]