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《Science of Surveying and Mapping》 2008-06
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EMD methods' application in deformation analysis

YU Chun-ping,LI Guang-yun,WEI Jian-dong,ZHANG Hao(Institute Of Surveying and Mapping,Information Engineering University,Zhengzhou 450052,China)  
The deformation monitoring is aim to ensure the safe of the structure,but in fact,the real deformation information is usually hidden in a mount of noises.So it's of great significance to recognize the useful deformation information with the right data processing method for the promotion of deformation analysis accuracy.Through bringing the Empirical Mode Deformation and threshold function to the field of deformation analysis,this paper proposes a scale threshold filtering method and fixes on the decomposing degree.With the simulated and survey data,the author do a series of comparisons through EMD scale filter,wavelet transform and polynomial fitting,draw some conclusions:At lower noise level,each method' result is nice;at the higher noise level,EMD Scale Filter and wavelet transform get better result than polynomial fitting.At last,some suggestions are given according to the different feature of methods.
【CateGory Index】: TN911.7
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