A trend application of EEMD in acceleration wave measurement technology
Zhou Fenghua1,Xie Qiang2,Wang Dongxiao1
1.State Key Laboratory of Tropical Oceanography,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301; 2.Sanya Institute of Deep-sea Science and Engineering,Chinese Academy of Sciences,Sanya 572000
Abstract In order to solve the problem of less precision in wave measurement caused by irregular trend items derived from double integration of acceleration signal in time domain,a method based on ensemble empirical mode decomposition (EEMD) is proposed to reconstruct and remove the low-frequency displacement trend,and retrieving the true displacement signal.According to process a set of observed Z-axis acceleration data from a surface buoys,compared with low-pass sliding filtering method (N=33),the results indicate that displacement signal correction method based on EEMD can effectively get rid of the low-frequency displacement trend item.Furthermore,this algorithm has better adaptability and robustness.
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