信号采样率对经验模态分解的影响研究

被引:13
作者
胡维平
杜明辉
机构
[1] 华南理工大学电子与信息学院
关键词
经验模态分解(EMD); 采样; Nyqvist频率;
D O I
暂无
中图分类号
TN911 [通信理论];
学科分类号
081002 ;
摘要
为更合理和准确的应用经验模态分解EMD方法,我们通过数值实验全面的研究了不同采样率对EMD的影响。结果表明采样率从两个方面影响经验模态分解,其一是由于离散化带来的非对准,导致的信号非对称从而给本征模态函数的提取带来的能量泄漏,其二为过高的归一化频率带来信号表达的粗糙化而引起的分解结果的正交性降低。实验结果也表明:较为理想的EMD应用环境应该为采样频率大于4倍的Nyqvist频率,而应用EMD的最低要求应该是:采样频率大于2倍的Nyqvist频率。该结果将对EMD方法的工程应用有着重要的指导意义!
引用
收藏
页码:637 / 640
页数:4
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