The Application of Wavelet Transform to Time-Frequency Analysis of Transient Electromagnetic Backscatter Signals

彭玉华; 刘亚询; 王玉平; 汪文秉

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The Application of Wavelet Transform to Time-Frequency Analysis of Transient Electromagnetic Backscatter Signals

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- The Application of Wavelet Transform to Time-Frequency Analysis of Transient Electromagnetic Backscatter Signals
- Acta Electronica Sinica Issue 9, (1995)
- 作者机构：
  
  西安交通大学信息与控制工程系
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN911.1
- Published：1995
- 稿件说明：
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[1]彭玉华,刘亚询,王玉平,汪文秉.应用小波变换于电磁场目标后向散射信号的时频图分析[J].电子学报,1995(09):109-111.

彭玉华, 刘亚询, 王玉平, et al. The Application of Wavelet Transform to Time-Frequency Analysis of Transient Electromagnetic Backscatter Signals[J]. Acta Electronica Sinica, 1995, (9).
[1]彭玉华,刘亚询,王玉平,汪文秉.应用小波变换于电磁场目标后向散射信号的时频图分析[J].电子学报,1995(09):109-111. DOI：

彭玉华, 刘亚询, 王玉平, et al. The Application of Wavelet Transform to Time-Frequency Analysis of Transient Electromagnetic Backscatter Signals[J]. Acta Electronica Sinica, 1995, (9). DOI：

摘要

本文将Ｍｏｒｌｅｔ小波用于电磁场后向散射信号的时频分析．为了更好地提高时频分析的时间和频率分辨率，我们对Ｍｏｒｌｅｔ小波进行了改进，并合理地选择尺度的变化规律，数据结果证明无论在同时提高时频分辨率还是抗噪声能力上，改进的Ｍｏｒｌｅｔ小波时频分析都优于短时傅里叶变换和Ｗｉｇｎｅｒ－Ｖｉｌｌｅ分布。

Abstract

The Morlet wavelet analysis is applied to analyze the time-frequency properties of electromanetic backscattered signals from targets. To improve the time and frequency resolution

we construct a related wavelet with instantaneous frequency that increases linearly with time

and make the scale increase properly. Compared with the conventional short-time Fourier transform and Wigner-Ville distribution

the numerical results show that the wavelet time-frequency analysis provides high time resolution in the early-time high frequency resolution in the late-time

and high detectivity in nolses.

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