基于IGS连续跟踪站的GPS高程时间序列分析

对全球分布的IGS连续跟踪站GPS高程分量时间序列,进行了小波多分辨率分析,发现各台站高程时间序列大都存在着季节性变化,这种以半周年项和周年项为主的季节性变化是由多种地球物理现象引起的,我们从多个方面分析了原因,并着重分析了大气压强的影响。利用分析的结果讨论了地壳垂直变化的规律,得出地球存在以半年和周年为周期的整体性扩张与收缩振荡运动,同时南北半球的变化规律存在差异的结论。

Analysis of GPS time series of height component based on IGS continuous observation stations

Firstly, a multi-resolution wavelet analysis for global distributed GPS height time series is performed in this paper. After analyzing, it is found that most stations have a seasonal variation. Both annual and semiannual periods variations are the result of a lot of geophysical phenomenon. Then, the authors analyze and study the reasons from several factors, especially from atmospheric pressure. Finally, they discuss the crustal vertical deformation with the results of analysis. The conclusion is that both annual and semi-annual vibrations of integrated expanding and contracting movement in the Earth are detected. Meantime, the movement follows different laws in the Northern and Southern Hemisphere.