| 低信噪比下的脉内调制方式识别 |
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| 引用本文： | 赵锋,刘渝,杨健.低信噪比下的脉内调制方式识别[J].数据采集与处理,2011,26(5). |
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| 作者姓名： | 赵锋 刘渝 杨健 |
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| 作者单位： | 南京航空航天大学大学电子信息工程学院 南京 210016 |
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| 摘 要： | 雷达信号脉内调制方式识别是电子对抗的重要内容。在实信号进行正交变换的过程中通过频域滤波来滤除带外噪声,提高信噪比,对滤波后的复信号利用改进的相位展开算法计算瞬时相位,然后对得到的瞬时相位曲线进行三次多项式拟合,根据拟合离差、拟合参数来自动识别常规信号、线性调频信号和三次多项式相位信号,并在正确识别调制方式的基础上进行参数估计。计算机仿真表明,本方法在信噪比不小于0dB的条件下,正确识别率达90%以上,且参数估计的精度较高。
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| 关 键 词： | 脉内调制识别 相位展开 曲线拟合 频域滤波 |
Intra-Pulse Modulated Signal Recognition in Low Signal-to-Noise Ratio |
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| Zhao Feng,Liu Yu,Yang Jian.Intra-Pulse Modulated Signal Recognition in Low Signal-to-Noise Ratio[J].Journal of Data Acquisition & Processing,2011,26(5). |
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| Authors: | Zhao Feng Liu Yu Yang Jian |
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| Affiliation: | Zhao Feng,Liu Yu,Yang Jian(College of Electronic and Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China) |
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| Abstract: | Intra-pulse modulated signal recognition is important in electronic warfare(EW).Filtering by a sliding window in the process of orthogonal transformation can remove the out-of-band noise and improve the signal-to-noise ratio(SNR).Then the phase of signals can be obtained by the improved phase unwrapping algorithm,thus automatically recognizing the normal signal,the linear frequency modulation signal and the three-order polynomial phase signal by fitting the curve of instantaneous phase,and estimating the pa... |
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| Keywords: | intra-pulse modulated recognition phase unwrapping curve fitting filtering in frequency-domain |
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