改进的GNSS水准地球重力场模型评价  

Investigation of Earth Gravitational Model(EGM)based on time-varying GNSS/leveling

作　　者：丁剑[1,2,3] 章传银[1] 许厚泽[3] 

机构地区：[1]中国测绘科学研究院,北京100830 [2]中国科学院大学,北京100039 [3]中国科学院测量与地球物理研究所,武汉430077

出　　处：《测绘科学》2015年第12期3-6,37,共5页Science of Surveying and Mapping

摘　　要：利用GNSS水准进行地球重力场模型精度评价是一种常用的外符合精度评价方法。针对GNSS水准与模型大地水准面高常存在较大的偏差,且常用的数学拟合方法会掩盖造成系统偏差的因素这一问题,该文分析了GNSS测量大地高的时变影响、全球大地水准面与水准测量起算面之间的区域性基准差,同时提出了顾及时变影响的GNSS水准地球重力场模型评价方法。It is a common external precision evaluation method of earth gravitational model（EGM）,which is GNSS/leveling.Due to various reasons,the geoid difference between GNSS/leveling and EGM is about several decimeters and even greater.Using mathematical method can get rid of main system deviation,but it also hides the time-varying effect,regional differences and other factors.This paper proposed a modified evaluation approach of EGM by GNSS/leveling,which was based on the analysis of GNSS measurement time-varying effect,regional difference between global geoid and leveling benchmark.

关 键 词：GNSS水准 地球重力场模型 地心运动 大地水准面零阶项 区域性高程基准位差 

分 类 号：P228[天文地球—大地测量学与测量工程]