跳频电磁引信干扰感知技术方案研究

doi:10.12305/j.issn.1001-506X.2022.11.06

Abstract

Abstract:

Frequency hopping signal is introduced into electromagnetic fuze of torpedo as a result of a broader working bandwidth and a better anti-interference capability. Making a list of alternative frequency points without a collision between working frequency and interference is one of the issues still needed to be solved for the moment. Working principle of frequency hopping electromagnetic fuze of torpedo is analyzed and the characteristics of its interference is studied. An interference sensing strategy based on spectrum management of cognitive radio technique is designed. A technical scheme on interference sensing based on multi-resolution spectrum sensing algorithm is proposed. The problem of background interference and random disturbance synchronous detecting in the frequency hopping electromagnetic fuze of torpedo is solved by using double-threshold judging method. A algorithm for hopping frequency selection is designed. Simulation results show that the technical scheme proposed is capable of interference sensing with a maximum detecting probability up to 0.995 at signal to noise ratio (SNR) 5 dB and a minimum false alarm probability below 0.25 at SNR -15 dB, using Gauss function as its wavelet function of the algorithm. In addition, the collision probabilities between frequency hopping and interference are both less than 0.05% as SNR above -5 dB while against reply interference and sweeping frequency interference.

Key words: frequency hopping, electromagnetic fuze, anti-interference, spectrum sensing

CLC Number:

Siwei TAN, Bo TANG, Linsen ZHANG, Sen ZHANG. Interference sensing technical solution for frequency hopping electromagnetic fuze[J]. Systems Engineering and Electronics, 2022, 44(11): 3330-3337.

Figures/Tables 10

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Table 1

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频率间隔/Hz	感知带宽/Hz	Y_f	最大检测概率
1 000	5	0.005	0.995
	10	0.010	0.990
	15	0.015	0.950
	20	0.020	0.860

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Interference sensing technical solution for frequency hopping electromagnetic fuze

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