基于滑动多周期FFT的调频引信抗扫频干扰方法  

Anti-Frequency Sweeping Jamming Method for FM Fuze Using Sliding Multi-cycle FFT

作　　者：周文 郝新红[1] 董二娃 陈彦君 ZHOU Wen;HAO Xinhong;DONG Erwa;CHEN Yanjun(Science and Technology on Electromechanical Dynamic Control Laboratory,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学机电动态控制重点实验室,北京100081

出　　处：《兵工学报》2023年第6期1744-1753,共10页Acta Armamentarii

基　　金：国家自然科学基金项目(61871414);国防科技基础加强计划项目(2019-JCJQ-ZD-324)。

摘　　要：针对调频引信快速傅里叶变换(FFT)谐波包络提取方法对抗扫频干扰效果差的问题,提出一种滑动多周期FFT处理方法。在分析扫频干扰作用下调频引信的失效机理的基础上,提出通过多周期FFT进行回波能量的相干积累,实现对干扰的有效抑制,并在相邻处理窗口间滑动更新处理数据,进一步提取预定炸高对应的差频谐波包络进行门限判决。仿真及实测结果表明:滑动多周期FFT处理方法能在扫频干扰下有效提取目标谐波包络特征,相较于传统单周期FFT处理方法,显著改善峰值旁瓣比,提高了调频引信抗扫频干扰的能力。This study proposes a sliding multi-cycle fast Fourier transform(FFT)processing method to address the problem of poor performance of the FFT harmonic envelope extraction method used in FM fuze under frequency sweeping jamming conditions.The proposed method aims to achieve effective interference suppression by coherently accumulating echo energy through multi-period FFT processing.The processing data is updated by sliding between adjacent processing windows,and the difference frequency harmonic envelope corresponding to the predetermined blast height is further extracted for threshold judgment.The simulated and measured results show that compared with traditional single-cycle FFT processing method,the new method can effectively extract the target harmonic envelope characteristics under frequency sweeping jamming,significantly improve the peak-to-side lobe ratio,and enhance the anti-frequency sweeping jamming performance of FM fuze.

关 键 词：调频引信 扫频干扰 相干积累 谐波包络 峰值旁瓣比 

分 类 号：TJ434.1[兵器科学与技术—火炮、自动武器与弹药工程]