基于滑动多周期 FFT 的调频引信抗扫频干扰方法

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.