| 苍岩,梁国龙.一种用于分析多频率分量信号时频分布的方法[J].,2007,26(5):262-266 |
| 一种用于分析多频率分量信号时频分布的方法 |
| A method of time-frequency distribution analysis of multi-frequency signal |
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| 中文摘要: |
| 文章介绍了一种适合于分析多频率成分信号时频分布的方法,介于维格纳分布(Wigner Dis- tribution WD)和频谱图二者之间,它不仅能够有效地抑制WD处理多参量信号时所产生的交叉项干扰,而且还能克服了加窗处理对频谱图的影响。此外,文章提出的算法具有较强的抗噪声干扰的能力。文章利用WD和文中提出的方法分别对一组线性调频信号进行仿真处理。结果表明,利用本文介绍的方法可以完全抑制多参量信号的交叉项干扰,得到"干净的"多参量信号瞬时频率分布。 |
| 英文摘要: |
| This paper presents a method that uses the time-frequency distribution to analysis multi-frequency signal.It is"between"the spectrogram and the WD and com- bines the good properties of both.It can not only remove the cross terms,but also can conquer the leakage of window usage.Since WD calculation needs to avoid alias of signal in the frequency domain by over-sampling,the computation of the method is increasing. The anti-noise capability of the proposed method is better than WD.In the end,the theory is illustrated by an example.A signal in the form of linear frequency modulated signal is treated by the WD and by the proposed method.The result indicates that method reduces the cross term,can get the"clear"instantaneous frequency of multi- frequency signal in time-frequency plan. |
| DOI：10.11684/j.issn.1000-310X.2007.05.003 |
| 中文关键词: 多频率分量 时频分布 维格纳分布 频谱图 |
| 英文关键词: Multi-frequency signal Time-frequency distribution WD Spectrogram |
| 基金项目: |
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