[口头报告]Analysis of the common model error on velocity field under Colored noise model by GPS and InSAR: A case study in the Nepal and everest region

Analysis of the common model error on velocity field under Colored noise model by GPS and InSAR: A case study in the Nepal and everest region
编号:2019 稿件编号:1374 访问权限:私有 更新:2023-04-10 23:39:46 浏览:332次 口头报告

报告开始:2023年05月06日 16:45 (Asia/Shanghai)

报告时间:10min

所在会议:[9B] 9B、地球物理与大地测量 » [9B-1] 9B-1 地球物理与大地测量

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摘要
The accuracy of the velocity fifield will be affected by the noise model and common mode errors through GPS time series analysis. In order to analyze the inflfluence of these two factors on the accuracy of the velocity fifield, two kinds of data are used, including the three-year observation from 20 permanent GPS stations with high spatial correlation in the Everest, which is about 650 km from north to south and 1068 km from east to west, and three-year 80 ascending images and 141 descending images from sentinel-1A, which are processed by GAMIT/GLOBK software and Small Baseline Subset-Interferometric Synthetic Aperture Radar method (SBAS-InSAR), respectively. The vertical deformation rate is solved by time series analysis through a self-made adaptive algorithm. In the analysis, the linear change rate, period, half period coeffificient, and residual sequence of all stations are solved by using James L. Davis periodic model. The noise type of residual sequence is analyzed by the power spectrum model. The spatio-temporal correlated noise, Common Mode Error (CME), is extracted by the Principal Component Analysis (PCA) and Karhunen-Loeve (KLE) methods. The results show that noises can be best described by “flflicker noise þ white noise” model. After the removal of CME, the R2 estimates of all stations are above 0.8, with RMS value of velocity fifield decreasing from 1.428 mm/yr to 1.062 mm/yr and 1.063 mm/yr to 0.815 mm/yr, in N and E directions, respectively, indicating that the inflfluence of CME can't be ignored in the extraction of the high-precision velocity fifield in the Nepal and Everest region.
关键字
GPS time analysis;,SBAS-InSAR;,Power spectrum analysis;,PCA;,KLE;,CME
报告人
许伟
中国地质大学(武汉)

稿件作者
许伟 中国地质大学(武汉)
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