| 经验模态分解在直升机谱特征提取中的应用 |
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| 引用本文： | 刘文海,李关防.经验模态分解在直升机谱特征提取中的应用[J].哈尔滨工程大学学报,2010,31(6). |
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| 作者姓名： | 刘文海 李关防 |
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| 作者单位： | 1. 哈尔滨工程大学,水声工程学院,黑龙江,哈尔滨,150001;海军装备部,沈阳地区军事代表局,辽宁,沈阳,110003
2. 江苏自动化研究所,江苏,连云港,222006 |
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| 摘 要： | 为了更有效地提取直升机辐射噪声的频谱特征,提出了一种基于经验模态分解(EMD)的特征提取算法.仿真研究表明EMD具有突出信号局部特征且余量可表征信号变化趋势的特性,该算法将目标辐射噪声的频谱构成和EMD的特性相结合,将EMD应用于变换域(信号频谱序列)信号分析,有效的实现了信号连续谱的提取.相比于平滑滤波器法须人为选择最优的α值,且提取的连续谱有滞后性的不足,文中所示方法可自适应的提取信号的连续谱,且在准确无滞后地估计连续谱的同时,对线谱有一定的"增益",为后续的目标识别提供更全面的信息.
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| 关 键 词： | 经验模态分解(EMD) 特征提取 直升机噪声 线谱提取 |
Application of empirical mode decomposition in helicopternoise spectrum feature extraction |
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| LIU Wen-hai,LI Guan-fang.Application of empirical mode decomposition in helicopternoise spectrum feature extraction[J].Journal of Harbin Engineering University,2010,31(6). |
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| Authors: | LIU Wen-hai LI Guan-fang |
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| Affiliation: | LIU Wen-hai1,3,LI Guan-fang 2(1.Colledge of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150001,China,2.Jiangsu Automation Research Institute of CSIC,Lianyungang 222006,3.Department stationed in Shenyang Representative bureau of the Navy Equipment,Shergyang 110003,China) |
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| Abstract: | In order to better extract identifying features in the sound spectra of helicopter-radiated noise,a new feature extraction algorithm based on empirical mode decomposition(EMD) was proposed.Simulation results showed that the EMD algorithm can emphasize a signal's instantaneous characteristics and that the residual trend information was the mutative trend of the original signal.The proposed algorithm combined the characteristics of the EMD algorithm and spectrum composition of helicopter-radiated noise.Applic... |
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| Keywords: | empirical mode decomposition(EMD) feature extraction helicopter-radiating noise line-spectrum extraction |
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