The Blocking Interference Law of Single Frequency Electromagnetic Radiation on Communication Radio Station

doi:10.12382/bgxb.2025.0251

Abstract

Abstract:

In order to improve the electromagnetic protection ability of communication radio station and reveal the blocking interference effect of single frequency electromagnetic radiation on the communication radio station，the nonlinear analysis of the receiving link of communication radio station is conducted，and then taking a certain type of communication station as the test object，the electromagnetic radiation experiments are carried out under the fixed frequency communication state.The results show that single frequency electromagnetic radiation is easy to cause the increase in bit error rate of communication radio and even lead to communication interruption，and the bit error rate is positively correlated with the intensity of interference signal.When the bit error rate increases to about 22%-23%，the increase in the radiation field strength will lead to communication interruption.The operating frequency has a great impact on the anti-blocking interference ability of radio station.The sensitive frequency band of the tested communication radio station is about (f₀-60)-( f₀+60)kHz.When the radiation frequency offset is within the range of ±1MHz，the critical interference field strength under different operating frequencies increases with the expansion of radiation frequency offset at both ends，and there is a clear size relationship of the critical interference field strength.Beyond this range，the critical interference field strength will be ups and downs with different levels，with different levels.In a certain range，enhancing the useful signal will improve the critical interference field strength，and the improvement times of the two are similar.The strength of the useful signal can be enhanced to significantly improve the anti-blocking interference ability of communication station.

Key words: communication radio station, single frequency electromagnetic radiation, blocking interference effect, bit error rate, critical interference field strength

ZHAO Kai, XUE Wenhui, RAN Xuguang, WANG Tao. The Blocking Interference Law of Single Frequency Electromagnetic Radiation on Communication Radio Station[J]. Acta Armamentarii, 2025, 46(S1): 250251-.

Figures/Tables 11

Fig.1 Analysis diagram of input signal vector

Fig.2 Electromagnetic radiation effect test platform for communication radio station

Fig.3 Variation of error rate with radiation field strength during in-band interference

Fig.4 Variation of error rate with radiation field strength during out-of-band interference

Table 1 Digital communication interference level division

	干扰等级	等级划分	干扰效果
信息损伤级	5	BER≤1%	干扰弱
	4	1%<BER≤5%	干扰较弱
	3	5%<BER≤7.5%	干扰较强
	2	7.5%<BER≤10%	干扰强
	1	BER>10%	干扰很强
工作破坏级		通信设备完全被阻塞，失去接收能力

Fig.5 Susceptibility curves under different operating frequencies (-1MHz≤Δfi≤1MHz)

Fig.6 Susceptibility curves under different operating frequencies (-30MHz≤Δfi≤40MHz)

Fig.7 Critical interference field strength at the same radiation frequency offset and different operating frequencies

Fig.8 Susceptibility curves for different useful signal strengths -1MHz≤Δfi≤1MHz)

Fig.9 Susceptibility curves for different useful signal strengths (-30MHz≤Δfi≤40MHz)

Table 2 The difference in critical interference field strength under different useful signal intensities

辐射频偏/kHz	-30000	-10000	-1000	-500	-200	-80	-40	-35	-30	-25
临界干扰场强差值/dB	4.3	10.3	11.6	11.1	9.7	9.0	1.7	0.9	10.3	10.8
辐射频偏/kHz	-20	-15	-10	-5	0	5	10	15	20	25
临界干扰场强差值/dB	12.0	12.3	12.3	11.6	9.4	8.6	8.9	9.7	9.7	10.1
辐射频偏/kHz	30	35	40	80	200	500	1000	10000	30000	/
临界干扰场强差值/dB	9.2	2.6	5.2	10.6	10.3	10.5	12.8	9.9	10.8	/
临界干扰场强差值平均值/dB	9.2
临界干扰场强差值方差/dB	10.0

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