DORIS、GPS和SLR空间大地测量技术导出的地心运动规律

Variations of geocenter motion derived from DORIS,GPS and SLR space geodesy techniques

用调和分析法分析DORIS、GPS和SLR 3种空间大地测量技术导出的地心运动时间序列。结果表明:地心长期运动不显著,但存在北向运动趋势,速度小于1mm/a;相对于DORIS和GPS,SLR导出的地心运动更符合地球物理模型计算的结果,用22aSLR数据导出的地心运动在X,Y,Z方向的周年运动振幅分别为2.8±0.2mm,2.7±0.2mm和6.1±0.2mm。

The geocenter motion time series derived from three kinds of space geodesy techniques including DORIS ,GPS and SLR , are analyzed using harmonic approach . Results show that , secular geocenter motion’s velocities are not evident ,but it has a trend toward north ,and its velocity is less than 1mm/a . Geocenter motion from SLR solution has the closest results ,compared with the one from geophysical solutions in the three space geodesy techniques .The annual amplitudes of geocenter motion derived from SLR solution using about 22 years data are 2 .8 ± 0 .2 mm ,2 .7 ± 0 .2 mm and 6 .1 ± 0 .2 mm in X ,Y ,Z directions ,respectively .