Second-order Intermodulation Low Frequency Blocking Effect and Mechanism for Communication Radio under Electromagnetic Radiation
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摘要:
为揭示通信电台复杂电磁环境效应机理，该文采用全电平辐照法实验研究了某型超短波数字通信电台的单频和带外双频电磁辐射阻塞效应，确定了其单频电磁辐射效应规律和敏感带宽，实验数据表明受试电台对带外双频3阶互调阻塞较单频电磁辐射阻塞干扰敏感9～23 dB。实验过程中发现了一种既不能用双频非互调迭加机理解释、也不能用3阶交互调机理解释的双频电磁辐射敏感现象。
Abstract:In order to reveal the complex electromagnetic environment effects mechanism of communication radio, the blocking effect of single-frequency and out-of-band dual-frequency electromagnetic radiation for the ultra-short wave digital communication radio is experimentally studied by irradiation method. The rule of single-frequency electromagnetic radiation effect and the susceptible bandwidth are determined. The experimental data show that the tested radio is 9～23 dB more susceptible to out-of-band dual-frequency third-order intermodulation blocking than single-frequency electromagnetic radiation blocking. A sensitive phenomenon of dual-frequency electromagnetic radiation which can neither be explained by the dual-frequency non-intermodulation superposition mechanism nor by the third-order intermodulation mechanism has been found in the experiment.
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表 1 通信电台双频3阶互调阻塞临界干扰场强
频率组合(kHz) Δf1=f1–f0 36 48 72 96 144 Δf2=f2–f0 72 96 144 192 288 临界干扰场强比 E1/E10 –11.7 –12.3 –13.3 –17.9 –18.2 E2/E20 –13.2 –22.5 –24.8 –32.3 –27.1 频率组合(kHz) Δf1=f1–f0 36 48 72 96 144 Δf2=f2–f0 48 86 154 212 268 临界干扰场强比 E1/E10 –8.7 –13.3 –13.6 –19.5 –19.8 E2/E20 –10.8 –17.0 –24.1 –19.9 –22.9 
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表 2 通信电台新型双频阻塞临界干扰场强
频率组合(kHz) Δf1=f1–f0 100 150 200 250 300 Δf2=f2–f0 150 200 250 300 350 临界干扰场强比 E1/E10 –25.6 –26.3 –28.7 –28.4 –30.6 E2/E20 –26.7 –29.5 –29.2 –30.5 –28.5 频率组合(kHz) Δf1=f1–f0 127 150 220 240 230 Δf2=f2–f0 177 160 330 360 390 临界干扰场强比 E1/E10 –26.5 –17.5 –30.6 –34.4 –4.0 E2/E20 –27.7 –17.7 –30.5 –34.4 –4.1
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表 3 干扰信号进入通信电台各结构后输出分量频率
结构 频率 天线接收 f1, f2 (设f1<f2) 一级放大 f1, f2, f2±f1, 2f1±f2和2f2±f1, 3f1和3f2 (忽略高阶互调分量) 上变频 Fm+f0–f1, Fm+f0–f2, Fm+f0–f2±f1, Fm+f0–2f1±f2, Fm+f0–2f2±f1, Fm+f0–3f1, Fm+f0–3f2和
Fm+f0+f1, Fm+f0+f2, Fm+f0+f2±f1, Fm+f0+2f1±f2, Fm+f0+2f2±f1, Fm+f0+3f1, Fm+f0+3f2窄带滤波 Fm+f0–f1, Fm+f0–f2, Fm+f0–2f1+f2和Fm+f0–2f2+f1 三级放大 Fm+f0–f1, Fm+f0–f2, Fm+f0–2f1+f2, Fm+f0–2f2+f1和f2–f1, 2(f2–f1), 3(f2-f1), 2(Fm+f0)–f1–f2,
2(Fm+f0–f1), 2(Fm+f0–f2), 2(Fm+f0)–3f1–f2, 2(Fm+f0)–3f2–f1 (忽略3阶互调)下变频与低通(带通)滤波 FL+f0–f1, FL+f0–f2, FL+f0–2f1+f2, FL+f0–2f2+f1, FL+(f2–f1), FL+2(f2–f1), FL+3(f2–f1)
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表 4 2阶互调低频阻塞干扰效应评估准确度
电台工作频率(MHz) 50 60 70 50 60 70 频率组合(kHz) f1–f0 200 200 200 200 200 230 f2–f0 250 250 250 300 300 330 临界干扰场强比 E1/E10 –25.0 –28.9 –29.1 –26.3 –30.2 –29.1 E2/E20 –23.7 –30.9 –22.0 –28.7 –30.1 –28.9 评估准确度R2 4.4 –6.7 2.0 –4.1 –9.4 –7.6
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