Research on Anti-frequency Sweeping Jamming Method for Frequency-modulated Fuze Based on Sparse Recovery

doi:10.12382/bgxb.2023.0369

Abstract

Abstract:

An anti-jamming method based on time-domain jamming cancellation and signal sparse reconstruction is proposed for the problem of “premature explosion” or “misfire” of continuous wave frequency-modulated (FM) fuzes under frequency sweeping jamming. The location and duration of jamming are detected through time-domain outliers, and the abnormal data are eliminated to suppress the impact of the jamming on the fuze. For the signal sparsity caused by jamming cancellation in time domain, an optimization equation for differential frequency signal reconstruction based on sparse regularization terms is established, and an ADMM-based iterative reconstruction algorithm is proposed. The performance of the proposed method is verified by using the simulated and measured data. The results show that the method can be used to suppress the influence of frequency sweeping jamming, accurately obtain the target range-velocity information, and improve the ability of FM fuze to resist the frequencys weeping jamming with a signal-to-noise ratio of -15dB and a zero sample rate of less than 70%.

Key words: sparse recovery, frequency sweeping jamming, frequency-modulated fuze, alternating direction method of multipliers

CLC Number:

TJ301

YANG Jin, HAO Xinhong, QAO Caixia, CHEN Qile. Research on Anti-frequency Sweeping Jamming Method for Frequency-modulated Fuze Based on Sparse Recovery[J]. Acta Armamentarii, 2024, 45(6): 2044-2053.

Figures/Tables 15

Fig.1 Fuze signal and sweep jamming frequency

Fig.2 Time-domain diagram of fuze differential frequency signal under sweep jamming

Fig.3 Flow chart of the proposed method

Table 1 Simulation parameters

参数	数值
调制频率/kHz	50
调制带宽/MHz	150
预定起爆距离/m	6
弹目速度/(m·s^-1)	300
滤波器带宽/MHz	5
干信比/dB	15
扫频带宽/MHz	200~300

Fig.4 Detected echo results before processing

Fig.5 Direct 2DFFT result after zeroing

Fig.6 Sparse recovery processing results

Fig.7 Algorithm processing results when the predetermined explosion height is 12m and the relative velocity of the projectile and target is 400m/s

Fig.9 Comparison of peak sidelobe ratios under different sample zeroing rates

Fig.10 Differential frequency signal processing results under different signal-to-noise ratios

Table 2 Comparison of PSLRs for different anti-frequency Jamming method

方法	处理后PSLR/dB
本文所提方法	6.50
文献[19]滑动多周期FFT方法	5.50
文献[20]时序及相关检测方法	5.34

Fig.11 Measuring scene

Fig.12 Time-domain diagram of differential frequency signal under frequency sweeping jamming

Fig.13 Results of traditional 2DFFT dfferential frequency signal processing

Fig.14 Sparse recovery processing results

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