基于EGM2008模型的GPS高程转换的精度分析  

The Accuracy Analysis of GPS Elevation Transformation Based on EGM2008 Model

作　　者：王铁生[1] 许宝成[1] 李广静[1] 

机构地区：[1]华北水利水电大学,河南郑州450011

出　　处：《水利与建筑工程学报》2014年第5期158-161,共4页Journal of Water Resources and Architectural Engineering

摘　　要：当今测绘领域研究较多的内容就是如何快速、高精度的测定控制点的高程。高精度的地球重力场模型被用来将GPS确定的大地高转换为正常高,以取代高劳动强度、低效率的水准测量。目前,GPS高程转换较为普遍的做法是根据已掌握的GPS控制网高程数据,应用EGM2008模型求出点位高程异常进而推算出网内各点的正常高。结合工程实例中对GPS高程控制网的试算,对上述GPS高程转换所达到的精度进行了分析,证实此方法可以达到四等水准的精度。Measuring elevation of the control points with speed and precision is the most popular research in the survery-ing field today .The high-precision earth gravitational field model is widely used in transforming geodetic heights measured by GPS to orthometric heights , in order to replace labor-intensive and inefficient differential leveling . Currently , the common practice in GPS elevation transformation is obtaining the height anomalies of the control points and then calculat-ing the orthometric heights based on EGM 2008 model by using elevation data of GPS control network .In the trial calcula-tion of GPS control network in eixsting engineering projects ,the accuracy of the GPS elevation transformation method pro-posed here was analysed .The result verifies that this method can reach the fourth grade of leveling accuracy .

关 键 词：EGM2008模型 GPS高程转换 精度分析 

分 类 号：P224[天文地球—大地测量学与测量工程]