| 一种改进的非整数自适应时延估计方法* |
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| 引用本文： | 李均浩,刘文红.一种改进的非整数自适应时延估计方法*[J].应用声学,2019,38(2):253-260. |
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| 作者姓名： | 李均浩 刘文红 |
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| 作者单位： | 上海电机学院 电气学院,上海电机学院 电子信息学院 |
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| 基金项目： | 国家自然科学基金项目 (61172108), 上海电机学院横向科研合作项目 (17B56) |
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| 摘 要： | 针对基于时延估计的机电设备故障声定位中的低信噪比和脉冲噪声情况,用α稳定分布建模噪声,改进了非整数自适应时延估计方法。共变相关法对观测序列进行时延估计粗测,将得到的估计值作为非整数自适应时延估计器的初值;将共变相关法中共变序列作为时延估计器的输入信号,在最小平均p范数准则下迭代得到非整数时延估计值。共变序列保留了原始序列间的时延信息,削弱了不相关的噪声。计算机仿真对比实验验证了改进的方法在脉冲环境和低信噪比条件下有更好的性能。
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| 关 键 词： | 设备声故障定位，α 稳定分布，共变，互相关法，非整数时延估计 |
| 收稿时间： | 2018/5/28 0:00:00 |
| 修稿时间： | 2019/2/28 0:00:00 |
An improved fractional adaptive time delay estimation method |
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| LI Junhao and LIU Wenhong.An improved fractional adaptive time delay estimation method[J].Applied Acoustics,2019,38(2):253-260. |
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| Authors: | LI Junhao and LIU Wenhong |
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| Institution: | School of Electronic Engineering, Shanghai Dianji University Shanghai,School of Electronics and Information,Shanghai Dianji University Shanghai |
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| Abstract: | Fractional adaptive time delay estimation(TDE) method is improved to adapt low signal to noise ratio(SNR) and impulse noise in equipment fault acoustic localization based on TDE, and modeling noise with stable distribution. Covariate correlation method is used to get integer bit of TDE, this value is used as initial value of adaptive delay estimator; covariant sequence in covariate correlation method is used as input signal of time delay estimator, finally, fractional TDE value is obtained by iteration under minimum average p norm criterion. Covariant sequence preserves time delay information between original sequences, weakens irrelevant noise. Computer simulations and comparative experiments verify that improved method has better performance under impulse environment and low SNR. |
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