| 基于Gabor-Radon变换的低信噪比雷达LFM信号检测与估计 |
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| 引用本文： | 江宝安,万群.基于Gabor-Radon变换的低信噪比雷达LFM信号检测与估计[J].重庆邮电大学学报(自然科学版),2010,22(1):27-32. |
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| 作者姓名： | 江宝安 万群 |
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| 作者单位： | 电子科技大学电子工程学院,四川,成都,610054;重庆邮电大学移通学院,重庆,400065;电子科技大学电子工程学院,四川,成都,610054 |
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| 基金项目： | 国家自然科学基金，国家863高技术研究发展计划，教育部科学技术研究重点项目 |
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| 摘 要： | 针对通常利用的匹配滤波法对低信噪比雷达LFM(linear frequency-modulated)进行信号检测和估计的不足,提出一种联合Gabor-Radon变换方法.通过计算雷达回波的Gabor时频变换,得到2D含强噪声和弱直线LFM的时频分布图;然后,利用Radon变换能对直线和边缘进行快速检测、抗噪能力强的特点,对时频2D图像进行Ra-don变换,检测出微弱LFM信号;再设置合适门限可对时频分布图去噪,进行Gabor逆变换可以得到去噪的时域波形.仿真结果证明了此方法能在低信噪比下有效地检测出LFM信号.
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| 关 键 词： | Gabor变换 Radon变换 LFM 去噪 |
| 收稿时间： | 2009/4/11 0:00:00 |
Radar LFM signal detection and estimation based on Gabor-Radon transform in low SNR |
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| JIANG Bao-an,WAN Qun.Radar LFM signal detection and estimation based on Gabor-Radon transform in low SNR[J].Journal of Chongqing University of Posts and Telecommunications,2010,22(1):27-32. |
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| Authors: | JIANG Bao-an WAN Qun |
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| Institution: | School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China |
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| Abstract: | In order to overcome the deficiency of radar linear frequency-modulated (LFM) signal detection and estimation, a method based on Gabor-Radon transformation was proposed. Through computing Gabor transform of the radar echoes, the 2D time-frequency distribution including strong noise and weak target LFM echoes were obtained. Then, using the characteristic that the Radon transform can fast detect beeline and brim and its strong anti-noise characteristic, the weak LFM echoes were detected. The appropriate threshold was set for denoising time-frequency distribution and time-domain waveform by inverse Gabor transform. Simulation result verifies that this method can effectively detect LFM signal in low SNR. |
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| Keywords: | LFM |
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