基于变换域时频切片的转发干扰认知算法

Repeat jamming cognition using time-frequency chips in U domain

雷达对数字射频存储转发干扰的认知(即检测与辨识)是对抗该种干扰的前提.针对使用线性调频信号的雷达,提出了基于分数阶傅里叶变换与U域短时傅里叶变换的切片差分特征提取算法,该算法利用转发式线性调频干扰在U域切片的相似性,有效地完成了密集转发式干扰的检测与识别.并采用计算机仿真验证了该算法性能的有效性.

The recognition of the digital radio frequency memory(DRFM)jamming is the precondition to jamming suppression of radar.To radar linear frequency modulation(LFM)signal,the slice difference of the fractional Fourier transform(FrFT)and short Fourier transform(SFT)in U domain is proposed to detect and discriminate the dense repeater jamming.The approximation of the slices of LFM signal repeat jamming in the U domain is adopted to accomplish the detection and discrimination and its efficiency is proven by computer simulation.