Research on Interference Mechanism of Swept-frequency Jamming to UWB Radio Fuze

doi:10.12382/bgxb.2022.0088

Abstract

Abstract:

An interference waveform pattern is studied for effective interference to UWB radio fuze. An interaction model of UWB radio fuze and periodically modulated interference signal are established. Based on the signal-to-interference ratio gain, the response characteristics of the fuze are analyzed under different noises, sine-wave amplitude modulation signals, sine-wave frequency modulation (FM) signals, and swept-frequency sinusoidal amplitude modulation (AM) signals. The simulated results are consistent with the theoretical values and verified by laboratory static confrontation tests. The results show that the swept-frequency AM interference is the most effective interference mode, and sine-wave AM interference is the best. By reasonably setting the parameters of the frequency sweep interference, the interference effect can be effectively improved.

Key words: ultra-wideband radio fuze, interference mechanism, interference signal, sweep interference

DONG Erwa, HAO Xinhong, YAN Xiaopeng, YU Honghai. Research on Interference Mechanism of Swept-frequency Jamming to UWB Radio Fuze[J]. Acta Armamentarii, 2023, 44(4): 1006-1014.

Figures/Tables 17

Fig.1 Block diagram of UWB radio fuze

Fig.2 Normalized spectrogram of Gaussian derivatives

Fig.3 Time domain waveform of emission signals

Fig.4 Unmodulated normalized spectrogram of emission signal

Fig.5 Normalized spectrogram of emission signal with a modulation coefficient of 0.3

Table 1 Processing gain expression of UWB fuze correlation detection under different types of interference signals

干扰信号	相关检测处理增益G
正弦干扰	$A 2 T r {∑ i = 0 N - 1 R [2 v r (i T + X i - X 0) c]} 2 N E \| H (f j) \| 2$
正弦波调幅	$A 2 E N 2 (1 + m a 2 2) · T \| H (f j) \| 2 + m a 2 2 [\| H (f j + f d j) \| 2 + \| H (f j - f d j) \| 2]$
正弦波调频	$A 2 E N 2 T \| H (f j) \| 2$

Table 1 Processing gain expression of UWB fuze correlation detection under different types of interference signals

干扰信号	相关检测处理增益G
正弦干扰	$A 2 T r {∑ i = 0 N - 1 R [2 v r (i T + X i - X 0) c]} 2 N E \| H (f j) \| 2$
正弦波调幅	$A 2 E N 2 (1 + m a 2 2) · T \| H (f j) \| 2 + m a 2 2 [\| H (f j + f d j) \| 2 + \| H (f j - f d j) \| 2]$
正弦波调频	$A 2 E N 2 T \| H (f j) \| 2$

Table 2 SIR gains of the fuze in different jamming situations

干扰方式	信干比增益理论值/dB	信干比增益仿真值/dB
噪声干扰	36	36.2009
正弦波调频干扰	23	23.5093
正弦波调幅干扰	20	20.5837

Fig.6 Output waveform of the fuze with an optimal jamming frequency

Fig.7 Output waveform of the fuze when jamming frequency deviates from optimal jamming frequency

Fig.8 Relevant output waveform of the fuze (sweep frequency range: fp±1000, number of points: 20)

Fig.9 Outputwaveform of the fuze (sweep frequency range: fp±550, number of points: 20)

Fig.10 Outputwaveform of the fuze (sweep frequency range: fp±350, number of points: 20)

Fig.11 Output waveform of the fuze (sweep frequency range: [fp-800,fp-300], number of points: 20)

Fig.12 Output waveform of the fuze (sweep frequency range: fp±350, number of points: 400)

Fig.13 Interference test scene of UWB radio fuze

Table 3 Fuze actuation at different jamming signals and SIRs

干扰方式	信干比/dB
干扰方式	-10	-20	-30	-40
噪声干扰	×	×	×	√
正弦波调幅干扰	×	×	√	√
正弦波调频干扰	×	×	√	√
正弦波调幅扫频干扰	×	√	√	√

Table 4 Fuze activation under sine wave amplitude modulation sweep frequency interference

干扰样式	扫频带宽/ GHz	扫频点数	引信30s内启动次数
	[3,5]	500	1
	[3,5]	200	3
	[3,5]	50	6
正弦波调幅	[3.5, 4.5]	500	4
扫频式干扰	[3.5, 4.5]	200	5
	[3.5, 4.5]	50	9
	[3.7, 4.3]	500	6
	[3.7, 4.3]	200	13
	[3.7, 4.3]	50	13

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