| 低信噪比下缓变线性调频信号的图像流法检测 |
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| 引用本文： | 尉宇,孙德宝,岑翼刚. 低信噪比下缓变线性调频信号的图像流法检测[J]. 红外技术, 2003, 25(3): 37-40,44 |
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| 作者姓名： | 尉宇 孙德宝 岑翼刚 |
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| 作者单位： | 华中科技大学,控制科学与工程系,湖北,武汉,430074;武汉科技大学,湖北,武汉,430074;华中科技大学,控制科学与工程系,湖北,武汉,430074 |
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| 摘 要： | 研究了低信噪比下缓变线性调频信号(LFM)的检测。信号的频率缓慢变化，微弱且淹没在强的白噪声之中，信噪比在-10dB以下。利用LFM信号在wigner—hough变换(WHT)平面上聚集成一尖峰值点的性质和其峰值点在多帧WHT平面缓慢连续运动的特征，提出了WHT与图像流法相结合检测缓变线性调频信号的新方法。计算机仿真证明了其有效性。
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| 关 键 词： | 信号检测 线性调频 WHT变换 图像流法 |
| 文章编号： | 1001-8891(2003)03-0037-04 |
The Image Flow Detection for the Small Rate LFM Signal With in Low SNR |
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| WEI Yu ,,SUN De bao ,CEN Yi gang. The Image Flow Detection for the Small Rate LFM Signal With in Low SNR[J]. Infrared Technology, 2003, 25(3): 37-40,44 |
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| Authors: | WEI Yu SUN De bao CEN Yi gang |
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| Affiliation: | WEI Yu 1,2,SUN De bao 1,CEN Yi gang 1 |
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| Abstract: | The detection of a linear frequency modulated signal(LFM) with small frequency rate is studied in very low signal noise ratio(SNR).The signal has an slowly increasing (or decreasing) frequency and is corrupted by powerful white noise. The SNR is low than -10 dB. Making use of the character that the LFM signal can collect a peak in a WHT plane and its peaks is slowly changed in sequence of the WHT plane, A new detection technique for this signal based on WHT and image flow is proposed. The technique is proved out by computer simulation of keeping good performance for this signal. |
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| Keywords: | signal detection LFM signal WHT image flow |
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