参考框架选取对连续GPS网测站坐标时间序列分析结果的影响

摘要

Aiming at analyzing the coordinate time series of crustal movement observation network of China (CMONOC),this paper explores the effect of three reference frames of different size and two kinds of similarity transformations with different transformation parameters on velocity field,annual term and residual position time series of the stations.On the basis of these solutions,for a long-term continuously observed GPS network covering a large area such as the Chinese mainland,a global reference frame makes the analysis results of the coordinate time series more stable and less sensitive to transformation parameters.By contrast,selecting a regional reference frame,especially one covering an area closer to the studied region,can present more information of regional deformation which aids in the study of the dynamic mechanism of this deformation.%针对中国大陆构造环境监测网络(CMONOC)坐标时间序列分析,研究选取3种不同空间尺度的参考框架以及考虑不同相似转换参数对测站速度场、年周期项及残差时间序列的影响.结果表明,对于中国大陆这样大范围、长时间连续观测的GPS网,采用全球框架坐标时间序列分析结果更加稳定,对转换参数选择不太敏感;但采用区域框架,特别是接近研究区域的小区域框架能够反映出更显著的区域形变特征,对于进一步研究其动力学机制是有利的.