| 分数阶Fourier变换与时频滤波 |
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| 引用本文： | 邓兵,陶然,齐林,刘锋.分数阶Fourier变换与时频滤波[J].系统工程与电子技术,2004,26(10):1357-1359. |
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| 作者姓名： | 邓兵 陶然 齐林 刘锋 |
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| 作者单位： | 1. 北京理工大学电子工程系,北京,100081;海军航空工程学院电子工程系,山东,烟台,264001
2. 北京理工大学电子工程系,北京,100081 |
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| 基金项目： | 国家自然科学基金资助课题(69972003) |
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| 摘 要： | 针对LFM信号非平稳性,分析了在分数阶Fourier域对LFM信号作时频滤波的含义,给出了扫频滤波器在分数阶Fourier域的实现方法,并在此基础上推广得到分数阶Fourier域的一般乘法滤波器。通过对实测混响数据和LFM信号的分离效果仿真,发现分离前后信混比得到了较大提高,并且初始信混比越低,则提高效果越明显。
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| 关 键 词： | 时频滤波 分数阶Fourier变换 LFM信号 扫频滤波器 |
| 文章编号： | 1001-506X(2004)10-1357-03 |
| 修稿时间： | 2003年8月3日 |
Fractional Fourier transform and time-frequency filtering |
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| DENG Bing.Fractional Fourier transform and time-frequency filtering[J].System Engineering and Electronics,2004,26(10):1357-1359. |
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| Authors: | DENG Bing |
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| Abstract: | With the introduction of fast algorithms of the discrete fractional Fourier transform, its potential has been found in DSP, and several filtering algorithms have been proposed for some given signals. The meaning of the time-frequency filtering in the fractional Fourier domain for linear FM signal is analyzed to deal with the non-stability of this kind of signal, and the realization of the swept-frequency filter in the fractional Fourier domain is provided. On this basis, a multiplicative filter in the fractional Fourier domain is introduced. With the actual reverberation data and the LFM pulse for seperation, good results are obtained: the reverberation is largely removed, and a better performance is shown at a lower SRR. |
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| Keywords: | time-frequency filtering fractional Fourier transform LFM signal swept-frequency filter |
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