基于RTK-GNSS的海上平台桩腿结构水平位移监测  

Horizontal Displacement Monitoring of Pile Leg Structure of Offshore Platform by RTK-GNSS

作　　者：熊春宝[1] 陈雯 王猛[1] 熊爱成 韩龙 于丽娜 Xiong Chunbao;Chen Wen;Wang Meng;Xiong Aicheng;Han Long;Yu Lina(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Tianjin Surveying and Hydrography Co.,Ltd.,Tianjin 300304,China)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]天津市陆海测绘有限公司,天津300304

出　　处：《天津大学学报（自然科学与工程技术版）》2021年第8期781-789,共9页Journal of Tianjin University：Science and Technology

基　　金：国家重点研发计划资助项目(2016YFC1401203).

摘　　要：采取RTK-GNSS技术对海上石油平台桩腿结构进行水平位移监测以分析其振动特征.针对复杂环境下多路径效应对RTK-GNSS监测结果的影响,利用草地和水域两种场地环境进行多路径效应测试试验.经分析,水域环境中多路径误差更大,而对于极为复杂的海上环境更需要对监测数据滤波降噪以削弱多路径误差.因此,提出了基于自相关函数和相关系数的集合经验模态分解(EEMD)-切比雪夫滤波对埕岛油田一平台桩腿结构的RTK-GNSS监测数据进行处理.结果表明:①RTK-GNSS技术能够用于海上环境中的平台桩腿动态位移监测;②自相关函数与相关系数相联合可以实现本征模态函数的有效选取和信号重构;③降噪前后信号的相关性均高于0.85,证明所提滤波方法既能保留有效信息成分又能削弱多路径误差;④经降噪后,可更清晰地看出桩腿结构的实时水平位移信息及运动轨迹,为海上结构监测提供了更优的途径.RTK-GNSS technology was adopted to monitor the horizontal displacement of the offshore oil platform pile leg structure to analyze its vibration characteristics.Aiming at the impact of multipath effects on the RTK-GNSS monitoring results in complex environments,a multipath effect test experiment was conducted using two field environments of grassland and water.Analysis results revealed a greater multipath error in the water environment.However,it was necessary to filter and reduce noise on the monitoring data for extremely complex marine environments to eliminate multipath errors.Therefore,the ensemble empirical mode decomposition(EEMD)-Chebyshev filter based on autocorrelation function and correlation coefficient was proposed to process the RTK-GNSS deformation monitoring data of the pile leg structure of Chengdao oilfield.Results showed that:①RTK-GNSS technology can be used on the sea dynamic deformation monitoring of platform legs in the environment;②the combined autocorrelation function and correlation coefficient can achieve an effective selection and signal reconstruction of intrinsic modal functions;③the correlation of signals before and after noise reduction was higher than 0.85,which proved that the proposed filtering method can retain effective information components and suppress multipath errors;and④after noise reduction,real-time horizontal displacement information and movement trajectory of the pile leg structure was evident,providing a better way for the deformation monitoring of offshore structures.

关 键 词：RTK-GNSS 多路径效应 海上平台 桩腿结构 振动位移 滤波降噪 

分 类 号：P228.4[天文地球—大地测量学与测量工程]