ETS对GPS站坐标时间序列噪声模型建立影响分析  

Analysis of ETS on the establishment of GPS station coordinate time series noise model

作　　者：贺小星[1,2] 孙喜文 HE Xiaoxing;SUN Xiwen(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]武汉大学测绘学院,湖北武汉430079

出　　处：《测绘工程》2020年第2期12-16,22,共6页Engineering of Surveying and Mapping

基　　金：国基自然科学基金资助项目(41804007);中国博士后科学基金资助项目(2018M632909);赣教高字2019江西省教育厅科学技术项目;东华理工大学江西省数字国土重点实验室开放研究基金资助项目(DLLJ201801)。

摘　　要：间歇性震颤与滑移ETS是一种大陆地区地震观测中未知的弱震动信号,分析ETS运动对GPS测站的影响有助于建立更为准确的GPS基准站运动模型,为地球动力学研究提供有价值的参考资料。文中以20个GPS基准站为研究对象,对FN+WN、PL+WN、GGM+WN及FN+RW+WN 4种不同噪声模型组合进行噪声分析,探讨ETS对GPS站坐标时间序列噪声模型建立影响,结果表明:ETS引起GPS站坐标序列噪声模型发生变化,且可造成噪声模型的错误估计;在准确估计站速度及其不确定度时必须考虑间歇性震颤与滑移因素,否则可能导致过高估计站速度及其不确定度;随着间歇性震颤与滑移参数的增加,RW的占比显著增加。Episodic tremor and slip ETS(Episodic Tremor and Slip)is an unknown weak vibration signal in seismic observations in the mainland.Analyzing the impact of ETS motion on GPS reference stations helps to establish a more accurate GPS reference station motion model.The paper takes 20 GPS reference stations as the research object,and performs noise analysis on four different noise model combinations of FN+WN,PL+WN,GGM+WN and FN+RW+WN and discusses the establishment of ETS to GPS station coordinate time series noise model.The result shows that the ETS causes the GPS station coordinate sequence to change and causes the noise model to be estimated incorrectly.The ETS factors must be considered when accurately estimating the station speed and its uncertainty,otherwise it may lead to excessive estimated station speed and its uncertainty.As the ETS parameters increase,the proportion of RW increases significantly.

关 键 词：间歇性震颤与滑移 GPS时间序列 噪声模型 站速度不确定度 可靠性分析 

分 类 号：P228.4[天文地球—大地测量学与测量工程]