Application of GNSS-PPP on Dynamic Deformation Monitoring of Offshore Platforms  

作　　者：YU Li-na XIONG Kuan GAO Xi-feng LI Zhi FAN Li-long ZHANG Kai 

机构地区：[1]Institute of Ocean Energy and Intelligent Construction,Tianjin University of Technology,Tianjin 300384,China [2]China Railway Construction Bridge Engineering Bureau Group Co.LTD,Tianjin 300300,China [3]School of Civil Engineering,Tianjin University,Tianjin 300072,China [4]Department of Land Surveying and Geo-Informatics,The Hong Kong Polytechnic University,Hong Kong,China [5]State Key Laboratory of Precision Blasting,Jianghan University,Wuhan 430056,China

出　　处：《China Ocean Engineering》2024年第2期352-361,共10页中国海洋工程（英文版）

基　　金：financially supported by the National Key R&D Program of China(Grant No.2022YFB4200705);the National Natural Science Foundation of China(Grant No.52109146)。

摘　　要：The real-time dynamic deformation monitoring of offshore platforms under environmental excitation is crucial to their safe operation.Although Global Navigation Satellite System-Precise Point Positioning(GNSS-PPP)has been considered for this purpose,its monitoring accuracy is relatively low.Moreover,the influence of background noise on the dynamic monitoring accuracy of GNSS-PPP remains unclear.Hence,it is imperative to further validate the feasibility of GNSS-PPP for deformation monitoring of offshore platforms.To address these concerns,vibration table tests with different amplitudes and frequencies are conducted.The results demonstrate that GNSS-PPP can effectively monitor horizontal vibration displacement as low as±30 mm,which is consistent with GNSS-RTK.Furthermore,the spectral characteristic of background noise in GNSS-PPP is similar to that of GNSS-RTK(Real Time Kinematic).Building on this observation,an improved Complete Ensemble Empirical Mode Decomposition with Adaptive Noise(CEEMDAN)has been proposed to de-noise the data and enhance the dynamic monitoring accuracy of GNSS-PPP.Field monitoring application research is also undertaken,successfully extracting and analyzing the dynamic deformation of an offshore platform structure under environmental excitation using GNSS-PPP monitoring in conjunction with improved CEEMDAN de-noising.By comparing the de-noised dynamic deformation trajectories of the offshore platform during different periods,it is observed that the platform exhibits reversible alternating vibration responses under environmental excitation,with more pronounced displacement deformation in the direction of load action.The research results confirm the feasibility and potential of GNSS-PPP for dynamic deformation monitoring of offshore platforms.

关 键 词：GNSS-PPP offshore platform dynamic deformation monitoring improved CEEMDAN de-noising 

分 类 号：P228.4[天文地球—大地测量学与测量工程] P75[天文地球—测绘科学与技术]