大地重力学的新进展

New Progress in Geogravimetry

介绍了当前利用卫星探测地球重力场的技术及其实践,也就是目前采用的高轨卫星追踪低轨卫星技术(hl-SST)、低轨卫星追踪低轨卫星技术(ll-SST)、卫星重力梯度测定技术(SSG),及其相应的正在运行的CHAMP、GRACE、GOCE卫星和考虑发射的GRACEFollow-On卫星。运行的三颗卫星所提供的地球重力场信息不论在精度和分辨率方面都是大地重力学的一个重大进展。介绍了地形数据在构建地球重力场模型中的作用和美国SRTM对全球地形数据的测量。最后介绍了EGM2008与我国已有大陆重力值的比较,平均差值约为11mgal,与我国大陆现有的高程异常值的比较,平均差值为27cm左右。

Measurement technologies for the EGM determination with satellites,i.e.hl-SST,ll-SST,SSG and corresponding CHAMP,GRACE and GOCE satellites are introduced.It is a great progress in the accuracy and resolution of EGM provided by the information delivered by the mentioned satellites.Besides,the satellite GRACE Follow On is briefly introduced.The functions of the topography data and SRTM in the EGM determination are introduced.Finally the comparisons between EGM2008 and corresponding data in China are introduced;the average differences are 11mgal for gravity data,and 27 cm for geoid in mainland of China.