| 自适应核时频分布在抑制交叉项中的应用 |
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| 引用本文： | 李亚安,王军,雷粉霞.自适应核时频分布在抑制交叉项中的应用[J].系统工程与电子技术,2004,26(11):1567-1569. |
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| 作者姓名： | 李亚安 王军 雷粉霞 |
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| 作者单位： | 西北工业大学航海学院,陕西,西安,710072 |
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| 基金项目： | 国家自然科学基金资助课题(10474079) |
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| 摘 要： | 分析了固定核函数时频分布在抑制交叉项方面的局限性以及基于信号特征的自适应时频分布对时频分辨率的改善。通过对基于信号特征的径向高斯核时频分布进行改进,提出了一种基于信号特征的自适应核时频分布的改进算法。该算法采用短时模糊函数和随时间变化的自适应核,能够在时频分布中区分出多分量信号的细节部分。仿真结果表明,该分布具有较高的时频分辨率,且无交叉项干扰。同时它还适合分析长时间信号和实现在线信号处理。
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| 关 键 词： | 自适应核时频分布 短时模糊函数 交叉项 |
| 文章编号： | 1001-506X(2004)11-1567-03 |
| 修稿时间： | 2003年9月4日 |
Application of adaptive kernel time-frequency distribution in cross-components suppression |
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| LI Ya-an,WANG Jun,LEI Fen-xia.Application of adaptive kernel time-frequency distribution in cross-components suppression[J].System Engineering and Electronics,2004,26(11):1567-1569. |
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| Authors: | LI Ya-an WANG Jun LEI Fen-xia |
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| Abstract: | The limitations of time-frequency distribution (TFD) with fixed kernel on cross-components suppression are analyzed and the improvement of time-frequency resolution using signal-dependent adaptive kernel TFD is explored. An improved algorithm for calculating the signal-dependent adaptive kernel time-frequency distribution is put forward based on the radially-Gaussian signal dependent representation. The algorithm adopts the short-time ambiguity function (STAF) and the adaptive kernel varying with time. It can differentiate the details of multi-component signals in TFD. Simulation results show that the new algorithm possesses a high time-frequency resolution and has no interferency terms. At the same time it is applicable to analysis of long signals and on-line signal processing. |
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| Keywords: | adaptive kernel time-frequency distribution short-time ambiguity function cross-component |
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