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。
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 charac- teristic 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 wave- form by inverse Gabor transform. Simulation result verifies that this method can effectively detect LFM signal in low SNR.
出处
《重庆邮电大学学报（自然科学版）》
北大核心
2010年第1期27-32,共6页
Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)
基金
国家自然科学基金(60772146)
国家863高技术研究发展计划(2008AA12Z306)
教育部科学技术研究重点项目(109139)
关键词
GABOR变换
RADON变换
LFM
去噪
Gabor transform
radon transform
linear frequency-modulated （LFM）
denoising
