一种削弱区域CORS站坐标时间序列非线性变化的方法  

A Method to Weaken the Non-Linear Changes in the Coordinate Time Series of Regional CORS Stations

作　　者：尹涛涛 王潜心[1] YIN Taotao;WANG Qianxin(School of Environment and Spatial Informatics,China University of Mining and Technology,1 Daxue Road,Xuzhou 221116,China)

机构地区：[1]中国矿业大学环境与测绘学院,江苏省徐州市221116

出　　处：《大地测量与地球动力学》2021年第7期695-699,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41874039);江苏省自然科学基金(BK20191342)。

摘　　要：为削弱测站非线性变化对速度场模型和噪声模型的影响,提出一种EMD分解与环境负载改正相结合的方法,利用徐州区域10个CORS站近2a(2016-06~2018-05)的时间序列对该方法进行验证。首先利用Bernese软件解算测站坐标时间序列,对去线性项的时间序列进行EMD分解,重构周期项和残差项;然后利用GFZ发布的环境负载产品对重构的周期项进行改正,以谐波函数拟合加环境负载改正方法作为对照。结果表明,EMD分解与环境负载改正方法对非线性项具有18%的修正效果,优于谐波函数拟合加环境负载改正方法;各测站在水平N方向和E方向改正不明显,U方向改正效果明显,产品综合改正效果优于单个产品改正效果。In order to weaken the influence of non-linear changes on the velocity field model and noise model,we propose a method which combines empirical mode decomposition and environmental loading correction.To prove the practicality of this method,we choose 2 a time series from 10 CORS stations in Xuzhou region.Firstly,we compute the times series using Bernese software,and use the detrended time series to reconstruct the periodic terms and residual terms.Then,we apply the environmental loading products released by GFZ to correct the reconstructed periodic terms,and use the harmonic function fitting and environmental loading correction method as a control.The results show that empirical mode decomposition and environmental loading correction method can reduce the non-linear term about 18%in average,which is better than the harmonic function fitting and environmental loading correction method.The corrections in the north and east directions have no apparent effect on each station,but the vertical direction correction effect is significant.The integrated product correction effect is better than single product correction effect.

关 键 词：EMD 环境负载 BERNESE 时间序列 非线性项 

分 类 号：P228[天文地球—大地测量学与测量工程]