Response Characteristics of Frequency-modulated Continuous Wave Fuze under Dense Sweep Jamming

doi:10.12382/bgxb.2023.0226

Abstract

Abstract:

As a typical suppressed jamming method, the dense sweep jamming poses a huge threat to frequency-modulated continuous wave (FMCW) fuze in the actual battlefield. Aiming at the problem that FMCW fuze is easy to fail under dense sweep jamming, the response process of FMCW fuze under dense sweep jamming is deduced on the basis of analyzing the working principle of FMCW fuze. Equivalent jamming effect after using zero time-domain interference sample is further analyzed, and the relevant simulation analysis and experimental verification are carried out. The simulated and experimental results show that the more similar the dense sweep jamming signal to the fuze signal, the larger the effective jamming proportion in the time-domain sample of beat frequency signal is. The interrupted-sampling and repeater jamming effect on the real target signal of FMCW fuze is produced after zeroing the interfered samples in time domain. Multiple false targets are generated on the envelope of distance dimension. The distribution of false targets is related to the equivalent duty cycle and jamming frequency after zeroing processing, which results in a significant increase in the explosion point dispersion of FMCW fuze.

Key words: FMCW fuze, dense sweep jamming, zeroing processing, interrupted-sampling and repeater jamming, response characteristic

CLC Number:

TJ434.1

ZHOU Wen, HAO Xinhong, YANG Jin, DUAN Lefan. Response Characteristics of Frequency-modulated Continuous Wave Fuze under Dense Sweep Jamming[J]. Acta Armamentarii, 2024, 45(7): 2251-2259.

Figures/Tables 18

Fig.1 Schematic diagram of dense sweep jamming

Fig.2 Time- and frequency-domain results of dense sweep jamming

Fig.3 Time-domain waveform with different K values

Fig.4 Time-domain waveform after zeroing processing

Fig.5 Schematic diagram of equivalent sampling

Fig.6 Schematic diagram of false targets distribution

Table 1 Simulation parameters

参数	数值
引信信号频率/kHz	50
引信信号带宽/MHz	200
干扰信号频率/kHz	50~200
扫频带宽/MHz	200~400
采样速率/MHz	50
交会距离/m	18~3
信干比/dB	-20~0

Fig.7 Time-domain waveform of signal with different dutycycle

Fig.8 Rendezvous process without dense sweep jamming

Fig.9 Rendezvous process with dense sweep jamming

Fig.10 Time-frequency diagram of rendezvous process with different duty ratios

Fig.11 Distance dimension envelope with different duty cycles

Table 2 Peak attenuation of different order targets dB

占空比/%	0阶	1阶	2阶	3阶
75	-1.21	-3.07	-8.72	-9.38
50	-3.06	-3.62	-5.89	-9.12
25	-6.26	-6.38	-6.74	-7.41

Fig.12 Time-frequency diagram of rendezvous process under different interference frequencies

Fig.13 Distance dimension envelope of rendezvous process under different interference frequencies

Table 3 Position offset distance of different order targets m

干扰频率/kHz	0阶	1阶	2阶	3阶
50	0.01	0.97	1.98	3.01
100	0.02	1.65	3.42	4.97
200	0.01	3.14	6.13	9.56

Fig.14 Experimental scene

Fig.15 Output results of fuze prototype

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