| 一种低信噪比线性调频脉冲信号参数提取方法 |
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| 引用本文： | 乐波,刘忠,古天祥.一种低信噪比线性调频脉冲信号参数提取方法[J].电子测量与仪器学报,2008,22(5). |
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| 作者姓名： | 乐波 刘忠 古天祥 |
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| 作者单位： | 1. 电子科技大学自动化学院,成都,610054;西南电子电信技术研究所,成都,610041
2. 电子科技大学电子工程学院,成都,610054;西南电子电信技术研究所,成都,610041 |
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| 摘 要： | 本文提出了一种低信噪比条件下的线性调频(LFM)脉冲信号参数提取的新方法.该方法通过自相关滤波提取出LFM脉冲信号的频域参数信息,根据频域参数信息,确定小波分解尺度数和信号采样频率,使对采样数据的小波分解结果中,信号的小波系数在最大尺度上占优.然后利用信号和噪声的小波系数模极大值在不同尺度间的传播特性,分尺度对小波系数进行非线性滤波,并进行信号重构,得到提高了信噪比的重构信号,从该信号中可以较好地检测出原LFM脉冲信号的时域信息.仿真实验表明,该方法能在信噪比低于0 dB时实现LFM脉冲信号时频参数提取.
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| 关 键 词： | 参数提取 自相关滤波 小波去噪 小波系数模极大值 线性调频脉冲信号 |
Parameter Extraction of Weak LFM Pulse Signal Based on Wavelet De-noising and Auto-correlation Filtering |
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| Le Bo,Liu Zhong,Gu Tianxiang.Parameter Extraction of Weak LFM Pulse Signal Based on Wavelet De-noising and Auto-correlation Filtering[J].Journal of Electronic Measurement and Instrument,2008,22(5). |
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| Authors: | Le Bo Liu Zhong Gu Tianxiang |
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| Affiliation: | Le Bo1,3 Liu Zhong2,3 Gu Tianxiang1(1.School of Automation Engineering,UESTC,Chengdu 610054,China,2.School of Electronic Engineering,3.Southwest Electronics , Telecommunication Technology Research Institute,Chengdu 610041,China) |
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| Abstract: | Using wavelet transform denoising and auto-correlation filtering, a weak linear frequency modulated (LFM) signal time-frequency parameter extraction method is developed. The frequency-domain information is extracted by an auto-correlation matched filter and is used to deduce the wavelet decomposition scale level and sampling frequency, which makes the wavelet coefficients of the signal dominate on the max scale. Using the different transmitting features of signal and noise wavelet transform modulus maxima (... |
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| Keywords: | parameter extraction auto-correlation filtering wavelet de-noising wavelet transform modulus maxima (WTMM) LFM pulse signal |
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