摘要
在利用卫星激光测距(SatelliteLaserRanging,简称SLR)资料研究地心运动时,将抗差估计和方差分量估计引入到数据处理中,根据1996年1月至2000年12月的Lageos2观测数据,分别采用直接法和动力法,计算出了2组相对于ITRF2000参考框架原点的地心运动序列。对计算结果进行了分析,得出了地心运动的平均值、变化速率及其周年项、半年项的振幅和相位,并与其他采用SLR资料计算的结果进行了比较。通过比较和分析,发现地心运动存在着近周年和近半年的周期分量,但地心运动的长期变化并不明显。
Two methods, robust estimation and variance component estimation, are applied in this paper to research the geocenter motion. With the direct and dynamic methods we get two time series of the geocenter motion with respect to ITRF2000 based on the analysis of the data set of Lageos2 from January 1996 to December 2000. The paper gives the mean offsets and the rate of the geocenter motion. It also gives the amplitudes and phases of the main terms of the geocenter motion. Finally we compare our results with other results in the literatures. By comparison and analysis, we find that there are annual and semiannual components in the geocenter motions, but, there is no significant longterm movement in the geocenter motions.
出处
《测绘学报》
EI
CSCD
北大核心
2003年第2期120-124,共5页
Acta Geodaetica et Cartographica Sinica
基金
国家杰出青年科学基金资助项目(49825107)