顾及交互相关的GPS时间序列时变速度模型建立方法研究

项目名称： 顾及交互相关的GPS时间序列时变速度模型建立方法研究

项目编号： No.41304007

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 周晓慧

作者单位： 武汉大学

项目金额： 25万元

中文摘要： 长期积累的GNSS坐标时间序列被广泛用于推算板块运动的速度模型和噪声模型，为研究区域构造学、冰后回弹过程等地学的热点问题提供了宝贵的基础数据。而现有的速度及噪声模型主要基于连续信号的假设，忽略了位置和速度存在的不连续性、未考虑周期性信号的可变性及单个测站三分量间的相互作用，导致推导的速度估值和精度不够科学与准确。针对上述不足，本项目拟以中国大陆及周边地区和北美西部的GNSS 时间序列为研究对象，引入统计方法实现不连续性探测、估计及修复；通过对周期信号中时间相关的参数估计，建立周期性时变信号模型，实现更准确的速度估值；基于交叉小波及相关分析方法，顾及时间序列自身三维的交互相关性及空间相关性，提出建立更严密的噪声模型方法，获取更真实的速度不确定性估值。本项目的研究对于利用GNSS位置时间序列监测板块运动和地壳变形等地球物理过程具有重要的科学和现实意义。

中文关键词： GNSS时间序列；共模误差；噪声模型；速度模型；交互相关

英文摘要： Long-term time series of GNSS station coordinates data contains abundant geophysical signals of interest. Velocities determined from those repeated point position measurements have been used to derive geodetic velocity models, that are widely applied to geodetic and geodynamics studies. The determination of rotations of tectonic blocks and localization of active geological features are but a few examples of research areas. Those researches rely on the correctness and accuracy provided by current noise models and velocity models. However, noise models and velocity models are not that perfect for now. Therefore, this project aims to: (1) analyze GNSS station coordinates time series under an uniform strategy. This includes combined use of multi-disciplinary theories and techniques to investigate three dimensional cross correlation of single time series that takes into consideration of overall three dimensional effects and hence,aiming to establish a complete cross-correlated spatial noise model that includes regional properties of geophysical effects; to establish an automatic detection method of position and velocity discontinuity in time series; (2) establish a more rigorous velocity model through analyzing the effect of periodic variability of non-tectonic factors (i.e. theharmonics and amplitudes)for periodic v

英文关键词： GNSS time series；common mode error；noise model；velocity model；cross correlation