| 采用K-L正交分解降低Chirp信号噪声的方法 |
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| 引用本文： | 刘皓,周楠清.采用K-L正交分解降低Chirp信号噪声的方法[J].电子科技大学学报(社会科学版),2008(4). |
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| 作者姓名： | 刘皓 周楠清 |
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| 作者单位： | 电子科技大学通信抗干扰技术国家级重点实验室; |
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| 摘 要： | 由于Chirp信号瞬时频率的估计易受噪声影响,该文利用K-L正交分解,提出了一种降低Chirp信号噪声的方法。K-L正交分解将噪声平均分配到各正交分量,而将信号主要集中在某一最大分量,从而提高信噪比。数学分析和仿真结果同时表明,该方法能降低信号噪声,改善信噪比达6dB,使瞬时频率估计更为准确。最后,结合Chirp信号自相关函数的特性,对该方法的应用做了进一步的推广。
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| 关 键 词： | Chirp 瞬时频率 K-L正交分解 降低噪声 |
A Method of Noise Reduction for Chirp Signal Based on K-L Orthogonal Division |
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| LIU Hao , ZHOU Nan-qing.A Method of Noise Reduction for Chirp Signal Based on K-L Orthogonal Division[J].Journal of University of Electronic Science and Technology of China(Social Sciences Edition),2008(4). |
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| Authors: | LIU Hao ZHOU Nan-qing |
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| Institution: | LIU Hao , ZHOU Nan-qing (National Key Laboratory of Communications,University of Electronic Science , Technology of China Chengdu 610054) |
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| Abstract: | Because the estimation of instantaneous frequency (IF) can be easily affected by noise, a method of noise reduction for Chirp signal based on K-L orthogonal division is presented. The signal is concentrated to a principal component, but the noise is equally distributed to several components. Thus, the SNR is improved. Both analysis and simulation indicate that this method works well and makes the estimation of IF more accurate. And the SNR can be improved over 6 dB. Moreover, associated with the characteris... |
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| Keywords: | Chirp instantaneous frequency K-L orthogonal division noise reduction |
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