| Alpha稳定分布噪声条件下的广义S变换时频分析 |
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| 引用本文： | 舒彤,余香梅,查代奉,邱天爽.Alpha稳定分布噪声条件下的广义S变换时频分析[J].信号处理,2014,30(6):634-641. |
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| 作者姓名： | 舒彤 余香梅 查代奉 邱天爽 |
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| 作者单位： | 九江学院电子工程学院 |
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| 基金项目： | 国家自然科学基金（61261046，60372081）；江西省教育厅科技项目（GJJ11244，GJJ11245，GJJ11621） |
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| 摘 要： | 在分析Alpha稳定分布噪声干扰下的非高斯信号时，基于传统二阶广义S变换时频算法效果显著退化。针对该问题，提出了基于分数低阶的广义S变换时频分析（FLO-GST）算法。该算法将分数低阶谱理论和常规广义S变换时频分布算法有机结合，同时优化窗口调节因子改善时频聚集性，得到较好的时频图谱。通过计算机仿真，并与其他时频算法进行对比，结果表明，该算法能有效抑制脉冲噪声干扰，更好的描述稳定分布噪声下非平稳信号的时频图谱，具有良好的韧性。
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| 关 键 词： | Alpha稳定分布 广义S变换 时频分析 分数低阶谱 |
| 收稿时间： | 2013-10-16 |
Time-Frequency Distribution of Generalized S-Transform Under Alpha Stable Distributed Noise Conditions |
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| Affiliation: | College of Electronic and Engineering,Jiujiang University,Jiujiang |
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| Abstract: | In order to solve the problem that generalized s-transform time-frequency distribution method is invalid under α-stable distribution noise environments. This paper proposes an improved fractional lower order generalized s-transform (FLO-GST) algorithm. It combines the theory of fractional lower order spectrum with conventional generalized s-transform time-frequency distribution algorithm, and at the same time introduces regulatory factor of window function to improve time-frequency concentration. The simulation results and analysis show that, compared to conventional methods of time-frequency analysis, the proposed method is more robust under α-stable distribution interference environments than conventional methods. |
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