基于Gabor-Radon变换的低信噪比雷达LFM信号检测与估计  

Radar LFM signal detection and estimation based on Gabor-Radon transform in low SNR

作　　者：江宝安[1,2] 万群[1] 

机构地区：[1]电子科技大学电子工程学院,四川成都610054 [2]重庆邮电大学移通学院,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》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)

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.

关 键 词：GABOR变换 RADON变换 LFM 去噪 

分 类 号：TN911.23[电子电信—通信与信息系统]