基于共轭FRFT模对消的反辐射导弹检测

ARM Detection Based on Conjugated FRFT

分析了载机回波信号和ARM回波信号以及它们的共轭信号的FRFT幅值特性,并利用此特性提出了一种基于共轭FRFT模对消的ARM目标检测方法。该方法利用ARM回波信号在最佳变换角度有较好的能量聚集,而其共轭信号在此最佳变换角度没有能量聚集;载机回波与其共轭信号在FRFT域关于原点对称的特点,利用两者FRFT模之差对消部分杂波,在保证信号能量基本不被削弱的前提下达到抑制载机干扰和杂波干扰、提高检测概率。IPIX雷达数据实验表明该方法在低信杂比条件下有较好的检测性能。

In the paper,the amplitude characteristics of ARM echo signal and ARM carrier echo and their conjugate signals are analyzed.On the basis,a detection method based on conjugated FRFT for ARM is proposed.The ARM echo signal has good energy congregate at the best angle,but its conjugate signal have no energy congregate at the angle.ARM carrier echo and its conjugate signal has symmetrical characteristic about the origin in FRFT domain.The difference between the two FRFT models is used to weaken partly ARM carrier echo and increase the detect probability.Experiment using IPIX data shows that the proposed method has good detection probability in low SCR.