| 基于EGM2008重力场模型的GPS高程转换方法及精度分析 |
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| 引用本文： | 张兴福,刘成,王国辉,康占龙,闫海波.基于EGM2008重力场模型的GPS高程转换方法及精度分析[J].地球物理学进展,2012,27(1):38-44. |
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| 作者姓名： | 张兴福 刘成 王国辉 康占龙 闫海波 |
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| 作者单位： | 1. 广东工业大学测绘工程系,广州,510006
2. 铁道第三勘察设计院集团有限公司测绘分院,天津,300251 |
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| 基金项目： | 中国科学院动力大地测量学重点实验室开放基金 |
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| 摘 要： | 研究利用重力场模型直接进行GPS高程转换的方法,即模型高程异常法和模型重力位法.根据误差传播定律,导出了由重力场模型位系数方差计算模型高程异常以及模型正常高的误差公式,并对影响两种GPS高程转换方法精度的因素进行分析.利用具有代表性的EGM96、EIGEN-51C和EGM2008重力场模型及某线路GPS/水准数据对两种方法进行实验研究与精度分析,结果表明:理论公式及实验结果都显示两种高程转换方法是等价的,转换精度相当;两种方法使用过程中,均可能需要系统偏差校正;EGM2008重力场模型具有非常好的分辨率及精度,在局部区域,基于EGM2008模型的GPS高程转换精度有望达到cm级.
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| 关 键 词： | 地球重力场模型 高程异常 重力位 GPS高程转换 精度分析 |
The methods and accuracy analysis of GPS height transformation based on EGM2008 earth gravity field model |
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| ZHANG Xing-fu
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LIU Cheng
,
WANG Guo-hui
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KANG Zhan-long
,
YAN Hai-bo.The methods and accuracy analysis of GPS height transformation based on EGM2008 earth gravity field model[J].Progress in Geophysics,2012,27(1):38-44. |
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| Authors: | ZHANG Xing-fu LIU Cheng WANG Guo-hui KANG Zhan-long YAN Hai-bo |
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| Institution: | 1.Department of Surveying and Geomatics,Guangdong University of Technology,Guangzhou 510006,China; 2.Dept.of Surveying and Mapping,Third Surveying and Design Institute L td.Comp.,Tianjin,300251,China) |
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| Abstract: | The methods of direct GPS height transformation based on Earth gravity field model are discussed in this paper.They include height anomaly method and gravity potential method.The error formulae of height anomaly and normal height are derived from the coefficient’s variance of Earth gravity field based on error propagation rules,and the factors effecting on the GPS height transformation precision for two methods are analyzed.Based on the two methods,the test and accuracy analysis are carried out with GPS/leveling data and representative model EGM96,EIGEN-51C and EGM2008.The results show that the two transformation methods are equivalent from the theoretical formulae and test results;the systematic bias may be corrected during the GPS height transformation;the accuracy and resolution of EGM2008 model is higher than EGM96 and EIGEN-51C,in local region,the centimeter-level accuracy may be achieved for GPS height transformation with EGM2008. |
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| Keywords: | Earth gravity model height anomaly gravity potential GPS height transformation accuracy analysis |
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