| LFM的一种自适应滤波方法 |
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| 引用本文： | 杨鹏,苑秉成,刘建国. LFM的一种自适应滤波方法[J]. 电声技术, 2009, 33(1): 68-71 |
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| 作者姓名： | 杨鹏 苑秉成 刘建国 |
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| 作者单位： | 海军工程大学兵器工程系,湖北,武汉,430033;海军兵种指挥学院陆战岸防战术指挥系,广东,广州,510430;海军工程大学兵器工程系,湖北,武汉,430033 |
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| 摘 要： | 研究了白噪声环境下线性调频信号的自适应滤波问题。提出了一种LFM自适应滤波算法,该算法利用分数阶傅里叶变换将LFM信号转化为正弦信号,在u域进行自适应滤波,利用分数阶傅里叶反变换得到滤波后的时域信号。该算法为白噪声下LFM信号增强、滤波提供了一种算法框架。性能分析表明,该算法的滤波效果取决于自适应滤波器的效果。最后仿真表明该算法效果明显,计算方便。
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| 关 键 词： | 线性调频信号 自适应滤波 分数阶傅里叶变换 |
An Adaptive Filter Method of LFM Signal |
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| YANG Peng,YUAN Bing-cheng,LIU Jian-guo. An Adaptive Filter Method of LFM Signal[J]. Audio Engineering, 2009, 33(1): 68-71 |
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| Authors: | YANG Peng YUAN Bing-cheng LIU Jian-guo |
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| Affiliation: | 1.Dept.of Weaponry Eng.;Naval Univ.of Engineering;Wuhan 430033;China;2.Dept.of Marine and Coast Defense Tactics Command;Naval Arms Command Academy;Guangzhou 510430;China |
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| Abstract: | An adaptive filter method of LFM signal in white noise is discussed.The conception and character of FRFT(FRactional Fourier Transform) is analyzed, and the result is that LFM signal can be transformed to sinusoid signal approximately using FRFT.The adaptive filter is implemented in u-domain, and the filtered signal in time domain is gained using fractional Fourier reverse transform.This method provides a uniform frame of LFM signal enhancement and filter in white noise.The results show that the performance ... |
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| Keywords: | LFM signal adaptive filter FRFT |
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