基于SSA探测GPS坐标时间序列的阶跃  

Detecting Offsets in GPS Coordinate Time Series Based on SSA Method

作　　者：苏利娜[1] 翟宏光 王秋宁[1] 田晓静 SU Lina;ZHAI Hongguang;WANG Qiuning;TIAN Xiaojing(Shaanxi Earthquake Agency,4 Shuiwen Lane,Xi’an 710068,China;Geodetic Data Processing Center,MNR,334 East-Youyi Road,Xi’an 710054,China)

机构地区：[1]陕西省地震局,西安市710068 [2]自然资源部大地测量数据处理中心,西安市710054

出　　处：《大地测量与地球动力学》2023年第5期464-466,486,共4页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震科技星火计划(XH20056Y);陕西省自然科学基础研究计划(2022JQ-225);中国地震局震情跟踪定向工作任务(2022010206)。

摘　　要：探测可能存在的阶跃是GPS坐标时间序列预处理的关键步骤,自动化探测阶跃对于密集台站或数量庞大的GPS网络管理具有重要意义。本文提出基于奇异谱分析的阶跃自动探测方法,并验证该方法的有效性。实验表明,该方法可以探测出有明显台阶的阶跃,且震后形变等瞬态运动不影响探测结果,但对于与背景运动差异不明显的阶跃存在一定的局限性。Detecting possible offsets is a key step in GPS coordinate time series preprocessing,and automatic detection of offsets is necessary for the management of dense or large GPS networks.Using real coordinate time series,we propose a new idea of automatic offset detection based on SSA,and verify the effectiveness of the method.The results show that the SSA-based method can successfully detect the offsets with obvious steps;transient motion such as postseismic deformation does not affect the detection results;however,in the case where the difference between the offsets and background motion is not obvious,this method is subject to certain limitations.

关 键 词：GPS坐标时间序列 自动探测 阶跃 奇异谱分析 

分 类 号：P228[天文地球—大地测量学与测量工程]