| 强背景噪声环境下的线性调频信号频率估计 |
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| 引用本文： | 朱振波,蒋兴舟,王亚洲.强背景噪声环境下的线性调频信号频率估计[J].电子信息对抗技术,2004,19(6):11-13. |
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| 作者姓名： | 朱振波 蒋兴舟 王亚洲 |
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| 作者单位： | 1. 海军工程大学,武汉,430033
2. 空军雷达学院,武汉,430019 |
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| 摘 要： | 估计信号的瞬时频率常用Cohen类时频分布的时间一阶条件矩,但这些方法在更低信噪比下存在较大的估计方差。基于线性调频信号的自相关和互相关可以实现噪声压缩的结论,提出了改进的基于互Wigner Ville分布线性调频信号的频率估计方法。该方法具有更强的抗噪声能力,在多元信号频率估计时,抑制了交叉项的影响。仿真实验的结果证明了算法的有效性。
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| 关 键 词： | 瞬时频率 时频分析 互WignerVille分布 |
| 文章编号： | CN51-1418(2004)06-0011-03 |
| 修稿时间： | 2003年10月8日 |
Estimation of the Instantaneous Frequency in High Noise Circumstance |
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| Authors: | ZHU Zhen-bo JIANG Xing-zhou Wang Ya-zhou |
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| Affiliation: | ZHU Zhen-bo~1,JIANG Xing-zhou~1,Wang Ya-zhou~2 |
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| Abstract: | The first moment of Cohen-frequency distribution has been commonly used to estimate the instantaneous frequency, however, it has a high variance for noise signals with low SNR. An improved algorithm used to estimate the instantaneous frequency based on cross Wigner-Ville distribution is given,which is based on the conclusion that the noise of LFM can be compressed by it's self-correlation or cross-correlation calculation. This method is efficient at reducing noise, and the effects of cross-terms are eliminated. The simulation results prove its effectivity. |
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| Keywords: | instantaneous frequency time-frequency analysis cross Wigner-Ville distribution |
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