地心运动时间序列的抗差谱分析  

Robust Spectral Analysis on Time Series of Geocenter Motion

作　　者：郭海荣[1] 杨元喜[2] 焦文海[2] 

机构地区：[1]信息工程大学测绘学院,河南郑州450052 [2]西安测绘研究所,陕西西安710054

出　　处：《测绘学报》2003年第4期308-312,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);国家自然科学基金资助项目(49874006)

摘　　要：本文将抗差估计与谱分析相结合,提出了抗差谱分析。用该方法对全球约120个IGS站5年GPS观测结果求得的地心运动时间序列进行了分析,发现地心运动在各方向有不同的主周期变化。X方向受地球物理交叉影响较大,无法分离出对该方向影响较大的主周期变化;而Y,Z方向都有明显的主周期变化。Y方向有明显的年周期变化、半年周期变化、季节性变化和月周期变化,其中,年周期变化的贡献最大;Z方向的主周期是年周期变化、半年周期变化、51天和609天的周期变化。与X,Y方向相比,Z方向振幅明显偏大。In this paper, a robust spectral analysis method is put forward. The method is a combination of robust estimation and spectral analysis. The time series of geocenter motion from the 5-year GPS data of about 120 IGS stations is computed and analyzed based on the robust spectral analysis. The results show that the geocenter motion has different principal periods in different directions. Various geophysical phenomena have great intersecting effects on X direction, thus the principal periods cannot be separated. Principal periods are, however, obvious in Y and Z directions. There are annual, semi-annual, seasonal and monthly periods in Y direction. Annual periods makes a great contribution towards Y direction. For Z direction, the principal periods are annual, semi-annual, 51-day and 609-day periods. The amplitudes in Z direction are obviously larger than those in Y and Z directions.

关 键 词：地心运动 时间序列 抗差估计 谱分析 

分 类 号：O211.61[理学—概率论与数理统计]