Harmonic timing sequence detection anti-jamming method and its implementation for FM fuze
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摘要:
针对调频（FM）引信抗干扰能力差的问题，提出了调频引信谐波时序检测抗干扰方法，利用弹目交会过程中谐波时序特征，提高了调频引信抗调幅（AM）、调频和扫频干扰能力；设计了基于快速傅里叶变换（FFT）的调频引信谐波提取方案，通过对差频信号进行FFT获得谐波幅值，与现有谐波定距调频引信通过带通滤波器（BPF）获得谐波幅值相比，在保证同等定距精度的前提下，可以灵活选取谐波次数和谐波通道，利用谐波时序性提高调频引信抗干扰能力，同时易于实现炸高分挡。仿真及实测结果验证了本文方案的可行性，调频引信抗干扰成功率由16.7%提高到90%以上。
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关键词:
- 调频(FM)引信 /
- 抗干扰 /
- 谐波时序检测 /
- 快速傅里叶变换(FFT) /
- 差频信号
Abstract:In order to improve the anti-amplitude-modulation (AM)-jamming, anti-frequency-modulation (FM)-jamming and anti-sweep-jamming performance of FM fuze, a harmonic timing sequence detection anti-jamming method is proposed using the timing sequence characteristics of harmonics during the projectile-target encounter. A harmonic extraction method based on fast Fourier transform (FFT) is designed, and the harmonic amplitude is obtained by FFT on the difference frequency signal. Compared with the harmonic extraction method through the band-pass filter (BPF) of the existing FM harmonic fuze, the harmonic number and harmonic channel can be flexibly selected, under the condition of the same ranging precision. The better anti-jamming performance and flexible ignition height are achieved using the harmonic timing sequence detection. Simulation and experimental results verify the feasibility of the program and the anti-jamming success rate of FM fuze is improved from 16.7% to more than 90%.
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图 1 基于BPF的谐波包络提取原理框图
Figure 1. Functional block diagram of BPF based harmonic envelope extraction
图 2 基于FFT的调频引信谐波时序检测抗干扰方法原理框图
Figure 2. Functional block diagram of FFT based harmonic time sequence detection anti-jamming method for FM fuze
图 3 2种方法的2、4、6、8次谐波通道多普勒输出信号
(SNR=-10 dB)
Figure 3. Output signal of the 2nd, 4th, 6th, 8th harmonic channel Doppler of two methods (SNR=-10 dB)
图 4 2种方法的2、4、6、8次谐波包络输出信号
(SNR=-10 dB)
Figure 4. Output signal of the 2nd, 4th, 6th, 8th harmonic channel envelope of two methods (SNR=-10 dB)
图 5 原理样机低速交会场景示意图
Figure 5. Schematic of low-speed intersection experiment for principle prototype
图 7 调幅扫频干扰下4、6、8次谐波幅度曲线
Figure 7. The 4th, 6th, 8th harmonic amplitude curves under AM-sweeping jamming
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