| 一种从辐射噪声中提取调制谱的方法 |
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| 引用本文： | 杨日杰,李宏,赵俊渭,姚蓝.一种从辐射噪声中提取调制谱的方法[J].应用声学,2000,19(1):27-31. |
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| 作者姓名： | 杨日杰 李宏 赵俊渭 姚蓝 |
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| 作者单位： | 1. 西北工业大学水声工程研究所西安 710072
2. 船舶工业总公司726研究所上海 200025 |
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| 摘 要： | 在水下航行器的辐射噪声中，螺旋桨节拍对航行器的宽带辐射噪声存在着明显的振幅调制，调制频率与航行器螺旋桨的转速有关。该特征可用于估计航行器的速度及目标分类与识别。本文利用子波变换原理，从实测的航行器辐射噪声中提取了它的调制谱，并据此对螺旋桨转速进行了估计，计算机仿真结果与实测的螺旋桨的转速具有良好的一致性。
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| 关 键 词： | 辐射噪声 子波变换 调制谱 水下航行器 |
A method of modulation spectrum extraction from radiated noise |
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| YANG Ri-jie,LI Hong,ZHAO Jun-wei and YAO Lan.A method of modulation spectrum extraction from radiated noise[J].Applied Acoustics,2000,19(1):27-31. |
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| Authors: | YANG Ri-jie LI Hong ZHAO Jun-wei and YAO Lan |
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| Institution: | Institute of ship electronic equipment, Shanghai 200025;Institute of ship electronic equipment, Shanghai 200025;Institute of ship electronic equipment, Shanghai 200025;Institute of ship electronic equipment, Shanghai 200025 |
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| Abstract: | In the radiated noise of the underwater vessels, there are obvious amplitude- modulation for broadband noise resulted by the propeller's tap. The modulation frequen- cies are related to the rolling speed of propellers of the vessel. This characteristic can be used to estimate the velocity of the vessel, and to classify and identify it. In this paper, wavelet transform is used to extract the modulation spectrum from the real radiated noise of the vessels. Based on the results, the rolling speed of the propeller is estimated, and the simulation results on computer are well consistent with the real rolling speed of the propeller. |
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| Keywords: | Radiated noise Wavelet transform Modulation spectrum Computer sim- ulation |
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