SUN Shu-de , WEI Hai-jun , WANG Hong-zhi , LI Guo-bin . Features extracting of ship shaft centerline orbit based on wavelet packet transform[J]. Journal of Dalian Maritime University, 2013 , 39(2) : 49 -52 . DOI: 10.16411/j.cnki.issn1006-7736.2013.02.024

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