基于滑动多周期FFT的调频引信抗扫频干扰方法

doi:10.12382/bgxb.2022.0119

摘要/Abstract

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。

关键词: 调频引信, 扫频干扰, 相干积累, 谐波包络, 峰值旁瓣比

Abstract:

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.

Key words: FM fuze, frequency sweeping jamming, coherent accumulation, harmonic envelope, peak-to-side lobe ratio

周文, 郝新红, 董二娃, 陈彦君. 基于滑动多周期FFT的调频引信抗扫频干扰方法[J]. 兵工学报, 2023, 44(6): 1744-1753.

ZHOU Wen, HAO Xinhong, DONG Erwa, CHEN Yanjun. Anti-Frequency Sweeping Jamming Method for FM Fuze Using Sliding Multi-cycle FFT[J]. Acta Armamentarii, 2023, 44(6): 1744-1753.

图/表 15

图1 调频引信工作原理

Fig.1 Working mechanism of the FM fuze

图2 单周期FFT处理结果

Fig.2 Single-cycle FFT processing results

图3 扫频干扰模型

Fig.3 Frequency sweep jamming model

图4 扫频干扰下失效机理

Fig.4 Failure mechanism under frequency sweeping jamming

图5 干扰信号差频频谱

Fig.5 Spectrum of beat signals under frequency sweeping jamming

图6 滑动多周期FFT处理流程

Fig.6 Sliding multi-cycle FFT processing flow

图7 滑动多周期FFT处理结果

Fig.7 Sliding multi-cycle FFT processing results

表1 仿真参数

Table 1 Simulation parameters

参数	数值
调制频率/kHz	100
调制带宽/MHz	200
弹目距离/m	15~0
JSR/dB	15
扫频带宽/MHz	400

图8 仿真数据单周期FFT处理结果

Fig.8 Single-cycle FFT processing results of simulation data

图9 仿真数据滑动多周期FFT处理结果

Fig.9 Sliding multi-cycle FFT processing results of simulated data

图10 滑动多周期FFT处理后PSLR结果

Fig.10 PSLR results of sliding multi-cycle FFT processing

表2 不同周期数所需计算时间

Table 2 Calculation time required for different cycles

参数	Q
参数	1	2	4	8	16	32
数据长度/B	256	512	1024	2048	4096	8192
计算时间/ms	0.06	0.13	0.28	0.57	1.12	2.18

图11 实验场景示意图

Fig.11 Schematic diagram of the test setup

图12 实测数据单周期FFT处理结果

Fig.12 Single-cycle FFT processing results of measured data

图13 实测数据滑动多周期FFT处理结果

Fig.13 Sliding multi-cycle FFT processing results of measured data

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