中国民航大学学报

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多层清除重复间隔阈值的EMD去噪及其应用

杜蓓,李猛   

  1. (中国民航大学电子信息工程学院,天津300300)
  • 收稿日期:2013-06-05 修回日期:2013-07-02 出版日期:2013-10-15 发布日期:2013-10-08
  • 作者简介:杜蓓(1982—),女,天津人,助教,硕士,研究方向为导航制导与控制.
  • 基金资助:

    天津市科技支撑计划重点项目(10ZCKFGX04000);中央高校基本科研业务费专项(ZXH2012D001)

EMD denoising with multiple clear iterative interval-thresholding and its application

DU Bei,LI Meng   

  1. (College of Electronic Information Engineering,CAUC,Tianjin 300300,China)
  • Received:2013-06-05 Revised:2013-07-02 Online:2013-10-15 Published:2013-10-08

摘要:

为了更好地提升经验模式分解(empirical mode decomposition,EMD)对于Mie 散射激光雷达信号的去噪效果,提出了一种多层清除重复间隔阈值(EMD-MCIIT)的EMD 去噪方法。首先,对多层固有模态函数(intrinsic mode function,IMF)进行去噪袁应用alter 函数对信号分量进行改变。然后,应用重复间隔阈值(EMD IIT )对信号进行滤波。通过信号仿真以及Mie 散射激光雷达真实回波信号的实验进行验证,与传统的EMD阈值方法进行比较,结果表明该方法可以有效地去噪,信噪比有了较大的提升,因此具有很好的应用前景。

关键词: 经验模式分解, 多层重复间隔阈值, Mie 散射激光雷达, 去噪

Abstract:

Aiming at improving the EMD denoising performanc for the Mie scattering radar signals,a multiple clear iterative interval-thresholding(EMD-MCIIT)is used in EMD denoising. The multiple IMFs is firstly employed and the alter function is used to change the noise signals,and then the signal is denoised by the iterative interval-thresholding. Through simulation and the experiment of real radar returning signals,it turns out that compared with the traditional EMD threshoding methods the proposed approach can denoise effectively and the SNR is improved. Therefore,the demonstrated technique has a promising future.

Key words: experience mode deposition (EMD), multiple clear iterative interval, threshoding (EMD-MCIIT), Mie scattering lidar, denoising

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