基于分数阶傅立叶变换的ARM检测技术

ARM Detection Technique Based on Fractional Fourier Transform

分数阶傅立叶变换(FRFT)是傅立叶变换的广义形式,对线性调频(LFM)信号具有很好的能量积累作用。针对反辐射导弹(ARM)雷达回波信号的线性调频特性,提出了一种基于FRFT的反辐射导弹检测方法,并根据ARM信号的调频特性将FRFT局域化,缩小了峰值搜索区域,提高了检测效率。仿真实验表明该方法能够在高斯、非高斯分布杂波环境下有效地检测ARM信号。

The fractional Fourier transform （FRFr） is a generalization of the Fourier transform. To the linear frequency modulation （LFM） signal, the FRFT is a good way for signal accumulation. Aiming at the linear frequency modulation characteristic of the antiradiation missile （ARM） echo signal, an improved method for ARM detection based on FRFr is proposed. The areas of peak search were reduced and the detection efficiency was improved when the FRFT was localized. The simulation experiments show that the reliable detection of ARM signal can be achieved with this method under the Gauss or non-Gauss clutter environment.